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Arulraj, A.; Murugesan, P.K.; Rajkumar, C.; Zamorano, A.T.; Mangalaraja, R.V. |
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Title |
Nanoarchitectonics of Layered Metal Chalcogenides-Based Ternary Electrocatalyst for Water Splitting |
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2023 |
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Energies |
Abbreviated Journal |
Energies |
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16 |
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4 |
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1669 |
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chalcogenides; nanoarchitectonics; electrocatalyts; water splitting; future perspectives |
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The research on renewable energy is actively looking into electrocatalysts based on transition metal chalcogenides because nanostructured electrocatalysts support the higher intrinsic activity for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). A major technique for facilitating the conversion of renewable and sustainable energy is electrochemical water splitting. The aim of the review is to discuss the revelations made when trying to alter the internal and external nanoarchitectures of chalcogenides-based electrocatalysts to enhance their performance. To begin, a general explanation of the water-splitting reaction is given to clarify the key factors in determining the catalytic performance of nanostructured chalcogenides-based electrocatalysts. To delve into the many ways being employed to improve the HER's electrocatalytic performance, the general fabrication processes utilized to generate the chalcogenides-based materials are described. Similarly, to enhance the OER performance of chalcogenides-based electrocatalysts, the applied complementary techniques and the strategies involved in designing the bifunctional water-splitting electrocatalysts (HER and OER) are explained. As a conclusive remark, the challenges and future perspectives of chalcogenide-based electrocatalysts in the context of water splitting are summarized. |
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1996-1073 |
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WOS:000939023900001 |
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UAI @ alexi.delcanto @ |
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1741 |
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Ashfaq, M.; Talreja, N.; Chauhan, D.; Rodriguez, C.A.; Mera, A.C.; Mangalaraja, R.V. |
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Synthesis of reduced graphene oxide incorporated bimetallic (Cu/Bi) nanorods based photocatalyst materials for the degradation of gallic acid and bacteria |
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2022 |
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Journal of Industrial and Engineering Chemistry |
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J. Ind. Eng. Chem. |
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110 |
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447-455 |
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Gallic acid; Graphene oxide; Bimetallic; Nanorods; Photocatalysis |
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Gallic acid (GA) is a polyphenols compound commonly present in wastewater that immensely affects aquatic and human life. GA is also responsible for the inhibitory effects on the microbial activity in the soil, thereby decreasing the fertility of the soil. Therefore, the removal of GA from the wastewater is necessary to combat such issues. The present study focused on the synthesis of reduced graphene oxide (rGO) incorporated bimetallic (Cu/Bi) based nanorods (r-GO-Cu/Bi-NRs) and their photocatalytic applications. Incorporating GO within the CuBi2O4-NRs might decrease the bandgap value, thereby increasing the interfacial charge transfer. Moreover, GO increased the reactive sites and oxygen defects onto the r-GO-Cu/Bi-NRs that led to the separation rate of the photo-induced charge carriers and migration, thereby enhancing the photodegradation ability of the synthesized r-GO-Cu/Bi-NRs. The synthesis process of the r-GO-Cu/Bi-NRs is facile, novel, and economically viable for the photocatalytic degradation of organic pollutants. |
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1226-086X |
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WOS:000891729100002 |
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UAI @ alexi.delcanto @ |
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1663 |
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Ashina, C.; Pugazhenthiran, N.; Sathishkumar, P.; Selvaraj, M.; Assiri, M.A.; Rajasekaran, C.; Gracia-Pinilla, M.A.; Mangalaraja, R.V. |
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Ultra-small Ni@NiFe2O4/TiO2 magnetic nanocomposites activated peroxymonosulphate for solar light-driven photocatalytic mineralization of Simazine |
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2023 |
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Journal of Environmental Chemical Engineering |
Abbreviated Journal |
J. Environ. Chem. Eng. |
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11 |
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6 |
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111342 |
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Simazine; Photocatalysis; Sonochemical approach; HPLC; Mineralization; Hydroxyl radicals |
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In the heterogeneous photocatalytic degradation of environmental contaminants the recovery, reuse of employed nanocatalyst was crucial and it is essentially required for the scale up applications. Besides, designing a magnetic material with heterojunction that can effectively oxidize the toxic organic contaminants to non-toxic substance under different reaction conditions including direct solar light irradiation remains a challenge. Considering the above facts, herein, we tailored heterojunction between the magnetic materials and non-magnetic materials with ultra-small Ni nanoparticles modified NiFe2O4/TiO2 nanostructures (Ni@NiFe2O4/TiO2 magnetic nanocomposites) through a simple sonochemical route. The Raman phonons at similar to 540 cm(-1) consistent to nickel metal nanoparticles and the spinel ferrites crystal structure confirmed the formation of Ni@NiFe2O4/TiO2 magnetic nanocomposites. The reduced optical bandgap of the resulting nanocomposites indicated the effective absorption of direct solar light irradiation when compared to the bare TiO2. Thus in-turn, enhanced the photocatalytic efficiency of simazine degradation in the presence of Ni@NiFe2O4/TiO2 magnetic nanocomposites (k= 11.0 x 10(-4) s(-1)) and augmented the activation of peroxymonosulphate (PMS) in the presence of Ni@NiFe2O4/TiO2 magnetic nanocomposites (k= 32.5 x 10(-4) s(-1)). Ni@NiFe2O4/TiO2 +PMS exhibited 3 folds enhanced efficiency in the presence of sunlight. The as-prepared NiFe2O4/TiO2 magnetic nanocatalysts were more stable and the efficiency of simazine oxidation was approximately same for the continuous five cycles at the optimized experimental conditions. The Ni@NiFe2O4/TiO2 magnetic nanocomposites preparation and the activation of PMS may promise the applications in an efficient wastewater treatment. |
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2213-2929 |
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WOS:001111068900001 |
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UAI @ alexi.delcanto @ |
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1926 |
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Baraneedharan, P.; Shankari, D.; Arulraj, A.; Sephra, P.J.; Mangalaraja, R.V.; Khalid, M. |
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Nanoengineering of MXene-Based Field-Effect Transistor Gas Sensors: Advancements in Next-Generation Electronic Devices |
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2023 |
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Journal of the Electrochemical Society |
Abbreviated Journal |
J. Electrochem. Soc. |
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180 |
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10 |
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107501 |
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2-DIMENSIONAL TITANIUM CARBIDE; TI3C2TX MXENE; SENSING PROPERTIES; MO2CTX MXENE; GRAPHENE; NANOSHEETS; NANOPARTICLES; COMPOSITES; STABILITY; HEALTH |
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In recent years, Two-Dimensional (2D) materials have gained significant attention for their distinctive physical and chemical properties, positioning them as promising contenders for the next generation of electronic technologies. One notable group within these materials is MXenes, which have exhibited remarkable breakthroughs across various technological domains, including catalysis, renewable energy, electronics, sensors, fuel cells, and supercapacitors. By making subtle modifications to the surface termination, introducing metal ions, precise etching timing, and applying surface functionalization, the characteristics of MXenes can be fine-tuned to achieve desired band structures, rendering them suitable for sensor design. This review focuses on the strategic development of gas sensors based on Field-Effect Transistors (FETs), thoroughly examining the latest progress in MXene-based material design and addressing associated challenges and future prospects. The review aims to provide a comprehensive overview of MXene, summarizing its current applications and advancements in FET-based gas sensing. |
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0013-4651 |
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WOS:001078580400001 |
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UAI @ alexi.delcanto @ |
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1900 |
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Chavez-Vásconez, R.; Arévalo, C.; Torres, Y.; Reyes-Valenzuela, M.; Sauceda, S.; Salvo, C.; Mangalaraja, R.V.; Montealegre, I.; Perez-Soriano, E.M.; Lascano, S. |
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Understanding the synergetic effects of mechanical milling and hot pressing on bimodal microstructure and tribo-mechanical behavior in porous Ti structures |
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2023 |
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Journal of Materials Research and Technology |
Abbreviated Journal |
J. Mater. Res. Technol. |
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27 |
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5243-5256 |
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porous titanium; Bimodal microstructure; Hot-pressing; Powder metallurgy; Mechanical milling; Mechanical behavior |
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The utilization of porous biomedical implants featuring a bimodal microstructure has garnered substantial interest within the scientific community. This study delves into the intricate interplay between processing parameters, microstructural attributes, and the tribo-mechanical performance of titanium grade 4, showcasing its potential to serve as implants to address compromised cortical bone tissue. The investigation meticulously examines the impact of milling duration (10 and 20 h), proportion of milled powder (50 and 75 wt%), and the volume fraction of space-holding agents (40-60 vol% NaCl) on the resulting characteristics of the bimodal microstructure, which plays a crucial role in achieving optimal biomechanical equilibrium. The Vickers microhardness, conventional and instrumented (P-h curves), and the wear behavior (ball-on disk) are discussed in terms of bimodal microstructure distribution, particle size and porosity level inherent to the fabrication conditions (mechanical milling + space-holder + hot-pressing). In general terms, milling time and milled powder fraction were the most influent parameters on the final properties of the materials. With the processing route used, the achieved microhardness values and wear behavior are comparable with those obtained by means of surface modifications or alloys. The Young's moduli obtained were in the range of 30-50 GPa, which could help to reduce the shielding phenomenon, while presenting a good mechanical resistance and wear behavior. In light of these findings, the fabricated specimen, composed of 75 wt% milled powder subjected to a 10-h milling duration, supplemented by a 60 vol% fraction of NaCl, emerges as a prime candidate manifesting superior biomechanical equilibrium. This judicious configuration exhibits a promising trajectory for its application in bone replacement endeavors. |
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2238-7854 |
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WOS:001115520800001 |
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UAI @ alexi.delcanto @ |
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1923 |
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Chelliah, C.K.; Murugan, M.; Rajivgandhi, G.; Gnanasekaran, C.; Govindan, R.; Maruthupandy, M.; Quero, F.; Arulraj, A.; Mangalaraja, R.V.; Alharbi, N.S.; Alshammary, N.H. |
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Phytochemical derivatives and secondary metabolites rich Rhizophora mucronata as an active anti-oxidant and anti-bacterial agent against multi drug resistant bacteria |
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2023 |
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Journal of King Saud University Science |
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J. King Saud Univ. Sci. |
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8 |
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102912 |
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Mangrove region; Environmental parameter; Phytochemical screening; Anti-oxidant activity; Bioactive materials |
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In the present study, the phytochemicals and anti-oxidant ability rich marine mangrove plant Rhizophora mucronata (R. mucronata) was evaluated. The UV-bio spectrometer result of O.D value of phenolic content was shown 0.986 as well as flavonoid content were shown 0.994 at 100 itg/mL concentration. The high yields of phenol and flavonoid contents were observed compared with standard gallic acid and rutin. Concisely, the more phenols and flavonoids and some bioactive derivatives were clearly exhibited by LC-MS scanning report. In addition, the anti-oxidant activity result shown with 85 % and DPPH scaveng-ing assay result shown 66% in crude extract of R. mucronata were observed and it was very higher than the rate of standard gallic acid and ascorbic acid. Further, the liquid-liquid extraction of available bioac-tive compounds were purified and shown excellent anti-bacterial activity against multi drug resistant bacteria. The anti-microbial activity result indicated that the 250 itg/mL of R. mucronata extract was shown 24 and 26 mm zone of inhibition against K. pneumoniae and A. baumannii. Then, the concentration dependent inhibition of R. mucronata extract was shown against both the tested pathogens and 250 itg/m concentrations was fixed as a minimum inhibition concentration range. Finally, the induction of outer cellular layer morphology effect and damaged size and shapes of the R. mucronata extract was shown against K. pneumoniae and A. baumannii. Altogether, the present study results were deliberately recom-mended that the R. mucronata extract as potential anti-oxidant and anti-bacterial agent. Hence, the natural marine mangrove plant R. mucronata is the safe, eco-friendly, low cost source for discovery of potential drug against various infections.(c) 2023 The Authors. Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
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1018-3647 |
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WOS:001088861200001 |
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UAI @ alexi.delcanto @ |
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1908 |
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Elangovan, K.; Saravanan, P.; Campos, C.H.; Sanhueza-Gómez, F.; Khan, M.M.R.; Chin, S.Y.; Krishnan, S.; Mangalaraja, R.V. |
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Outline of microbial fuel cells technology and their significant developments, challenges, and prospects of oxygen reduction electrocatalysts |
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2023 |
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Frontiers in Chemical Engineering |
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Front. Chem. Eng. |
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5 |
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1228510 |
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microbial fuel cells (MFCs); oxygen reduction reaction (ORR); electrocatalysts; electricity production; wastewater treatment |
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The microbial fuel cells (MFCs) which demonstrates simultaneous production of electricity and wastewater treatment have been considered as one of the potential and greener energy production technology among the available bioelectrochemical systems. The air-cathode MFCs have gained additional benefits due to using air and avoiding any chemical substances as catholyte in the cathode chamber. The sluggish oxygen reduction reaction (ORR) kinetics at the cathode is one of the main obstacles to achieve high microbial fuel cell (MFC) performances. Platinum (Pt) is one of the most widely used efficient ORR electrocatalysts due to its high efficient and more stable in acidic media. Because of the high cost and easily poisoned nature of Pt, several attempts, such as a combination of Pt with other materials, and using non-precious metals and non-metals based electrocatalysts has been demonstrated. However, the efficient practical application of the MFC technology is not yet achieved mainly due to the slow ORR. Therefore, the review which draws attention to develop and choosing the suitable cathode materials should be urgent for the practical applications of the MFCs. In this review article, we present an overview of the present MFC technology, then some significant advancements of ORR electrocatalysts such as precious metals-based catalysts (very briefly), non-precious metals-based, non-metals and carbon-based, and biocatalysts with some significant remarks on the corresponding results for the MFC applications. Lastly, we also discussed the challenges and prospects of ORR electrocatalysts for the practical application of MFCs. |
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2673-2718 |
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WOS:001067619400001 |
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UAI @ alexi.delcanto @ |
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1898 |
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Eswaramoorthy, N.; Arulraj, A.; Mangalaraja, R.V.; Pitchaiya, S.; Rajaram, K. |
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Nanoscale interfacial engineering of 1D g-C-3 N-4 enables effective and thermally stable HTL-free carbon-based perovskite solar cells with aging for 100 hours |
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2022 |
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International Journal Of Energy Research |
Abbreviated Journal |
Int. J. Energy Res. |
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46 |
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14 |
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20194-20205 |
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g-C3N4; interfacial engineering; one dimensional; perovskite solar cells; thermal stability |
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Carbon-based perovskite solar cells (PSCs) have exhibited unprecedented progress in the past decades, however, the deficit of open-circuit voltage and non-radiative recombination losses are the dominating limiting factors in scaling up the devices in view of commercialization. The researchers and scientists recognize the dominating factors and propose different themes to overcome the limiting factors. Among the different solutions, interfacial engineering of PSCs between the interfaces of transporting layer (electron or hole) and perovskite influences the reduction of non-radiative recombination losses with improvement in device efficiency. In this work, one-dimensional (1D) graphitic carbon nitride (g-C3N4) is synthesized through simple pyrolysis using two different mediums (ethanol and ethylene glycol). 1D g-C3N4 is interfaced between electron transport layer and perovskite absorber influences effectively in fine-tuning the work function by aligning the energy level of the fabricated mixed halide PSCs. Nanoscale engineered 1D g-C3N4 interfacial layer supports boosting the power conversion efficiency of the PSCs to 5.20% and 7.14% for tube and layered tube structures at ambient conditions. Further, the interfacial layer aids in improving thermal (tube: similar to 59.80%; layered tube: similar to 74.50%) and photostability (tube: similar to 78.65%; layered tube: similar to 87.25%) characteristics of the fabricated devices for 100 h duration at ambient conditions. |
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0363-907X |
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WOS:000819290400001 |
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UAI @ alexi.delcanto @ |
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1600 |
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Gaikwad, V.M.; Dash, B.B.; Sahoo, P.K.; Shirbhate, S.C.; Pabba, D.P.; Acharya, S.A.; Lad, A.B.; Nayak, A.K.; Mangalaraja, R.V.; Aepuru, R. |
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Polarization induced ferroelectric and magnetic ordering in double-perovskite-based flexible 0-3 composite |
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2023 |
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Journal of Materials Science-Materials in Electronics |
Abbreviated Journal |
J. Mater. Sci. Mater. Electron. |
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34 |
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8 |
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720 |
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MULTIFERROIC PROPERTIES |
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The novel multiferroic flexible films of Dy2NiMnO6 (DNMO) were prepared by incorporating DNMO particles in Polyvinylidene fluoride-based co-polymeric P(VDF-HFP) system. The structural studies validated the crystalline structure of DNMO remains unaffected by the presence of polymer. The scanning electron microscopic image of the composite sample confirms the uniform distribution of DNMO particles in the polymeric matrix. The enhancement in the ferroelectric parameters was observed for the composite sample in comparison with P(VDF-HFP) polymeric film. The composite sample exhibits a large polarization and coercive field at room temperature with enhanced dielectric behavior with reduced dielectric loss. M-H curves of composite show ferromagnetic nature with small increase in coercivity at 5 K. The field- and temperature-dependent magnetic characteristics of DNMO have remained unaltered even though the engagement of P(VDF-HFP) for achieving flexibility. The simultaneous existence of ferroelectric and magnetic order in the flexible DNMO may discover its application in the field of flexible magnetoelectronics. |
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0957-4522 |
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WOS:000948433400006 |
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UAI @ alexi.delcanto @ |
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1773 |
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Gnanasekaran, C.; Govindan, R.; Chelliah, C.K.; Govindan, R.; Ranganathan, P.; Muthuchamy, M.; Quero, F.; Arunachalam, A.; Mangalaraja, R.V.; Alharbi, N.S.; Natesan, M. |
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Isolation and molecular detection of endophytic actinomycetes Nocardiopsis dassonvillei DMS 1 (MH900216) from marine sea grasses with bacterial inactivation |
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2023 |
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Biocatalysis and Agricultural Biotechnology |
Abbreviated Journal |
Biocatal. Agric. Biotechnol. |
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54 |
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102938 |
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Arine environment; Sea grasses; Endophytes; Actinomycetes; Biological properties; Minimum inhibition concentration |
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In recent years, new antibiotics have been discovered around the world in order to inhibit multi drug resistant (MDR) pathogens. To overcome this problem, marine actinomycetes are an alternative choice for producing new bioactive compounds that inhibit MDR bacteria. The typical endophytic actinomycete (EA) Nocardiopsis dassonvillei (N. dassonvillei) DMS 1 (MH900216) was isolated from marine Sea grasses by surface sterilization method. After surface sterilization, it was confirmed that the pure, dry, white-colored spore producing colonies emerged from the internal tissue of the Sea grasses. The crude extract of N. dassonvillei DMS 1 (MH900216) demonstrated 8 and 10-mm zones of inhibition against A. baumannii and K. pneumoniae, respectively. The composition of N. dassonvillei DMS 1 (MH900216) with potential anti-bacterial properties was studied by GC-MS analysis and exhibited 22 chemical compounds. Subsequently, the molecular identification and phylogenetic construction of the isolated EA strain was confirmed as N. dassonvillei DMS 1 (MH900216). The liquid-liquid extraction of the compound demonstrated 24-and 26-mm zones of inhibition against A. baumannii and K. pneumoniae, respectively. Furthermore, the purified crude compound demonstrated 92% and 94% cell death against A. baumannii and K. pneumoniae, respectively, at a minimum inhibitory concentration of 500 mu g/mL. Overall, the present study demonstrated the antibacterial properties of the EA N. dassonvillei DMS 1 (MH900216) isolated from Sea grasses and their importance as alternative sources for discovering new antibiotics to inhibit MDR bacteria. |
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1878-8181 |
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WOS:001118490200001 |
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UAI @ alexi.delcanto @ |
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1927 |
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Govindan, R.; Gnanasekaran, C.; Govindan, R.; Muthuchamy, M.; Quero, F.; Jothi, A.; Chelliah, C.K.; Arunachalam, A.; Mangalaraja, R.V.; Natesan, M,; Kadaikunnan, S,; Li, W.J. |
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Anti-quorum Sensing and Anti-biofilm Effect of Nocardiopsis synnemataformans RMN 4 (MN061002) Compound 2,6-Di-tert-butyl, 1,4-Benzoquinone Against Biofilm-Producing Bacteria |
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Year |
2023 |
Publication |
Applied Biochemistry And Biotechnology |
Abbreviated Journal |
Appl. Biochem. Biotechnol. |
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Early Access |
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Marine actinomycetes; Spectroscopic analysis, HPLC purification, Anti-QS activity; Anti-biofilm activity; Scanning electron microscopy |
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In this study, the anti-biofilm compound of 2,6-Di-tert-butyl, 1,4-benzoquinone was purified from Nocardiopsis synnemataformans (N. synnemataformans) RMN 4 (MN061002). To confirm the compound, various spectroscopy analyses were done including ultraviolet (UV) spectrometer, Fourier transform infrared spectroscopy (FTIR), analytical high-performance liquid chromatography (HPLC), preparative HPLC, gas chromatography-mass spectroscopy (GC-MS), liquid chromatography-mass spectroscopy (LC-MS), and 2D nuclear magnetic resonance (NMR). Furthermore, the purified compound was shown 94% inhibition against biofilm-producing Proteus mirabilis (P. mirabilis) (MN396686) at 70 mu g/mL concentrations. Furthermore, the metabolic activity, exopolysaccharide damage, and hydrophobicity degradation results of identified compound exhibited excellent inhibition at 100 mu g/mL concentration. Furthermore, the confocal laser scanning electron microscope (CLSM) and scanning electron microscope (SEM) results were shown with intracellular damages and architectural changes in bacteria. Consecutively, the in vivo toxicity effect of the compound against Artemia franciscana (A. franciscana) was shown to have a low mortality rate at 100 mu g/mL. Finally, the molecular docking interaction between the quorum sensing (QS) genes and identified compound clearly suggested that the identified compound 2,6-Di-tert-butyl, 1,4-benzoquinone has anti-quorum sensing and anti-biofilm activities against P. mirabilis (MN396686). |
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0273-2289 |
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WOS:001105945900003 |
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UAI @ alexi.delcanto @ |
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1931 |
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Karthikeyan, C.; Sisubalan, N.; Varaprasad, K.; Aepuru, R.; Yallapu, M.M.; Mangalaraja, R.V.; Umaralikhan.; Sadiku, R. |
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Hybrid nanoparticles from chitosan and nickel for enhanced biocidal activities |
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Year |
2022 |
Publication |
New Journal Of Chemistry |
Abbreviated Journal |
New J. Chem. |
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Volume |
46 |
Issue |
27 |
Pages |
13240-13248 |
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ANTIBACTERIAL; CANCER; RESISTANCE |
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Chitosan (Cs) is highly useful for its 'tunable' function, hence allowing numerous optimizable applications in various fields, including the pharmaceutical industry. This has piqued the medicinal chemist's interest in developing innovative synthetic methodologies to produce a biologically optimistic pharmacophore. In order to design a highly environment-friendly artificial process for the production of Cs/Ni/NiO, hybrid nanoparticles (HNPs) were prepared by an inexpensive chemical synthesis method. The synthesized HNPs were characterized by XRD, DLS, and ATR-FTIR analyses. The morphology and elemental analyses of Cs/Ni/NiO HNPs were investigated using FESEM, TEM, and EDX procedures. Cs/Ni/NiO HNPs bactericidal activity was significant for inhibiting pathogenic bacterial strains, namely, S. aureus and E. coli. Furthermore, Cs/Ni/NiO HNPs exhibited potent cytotoxicity against MCF-7. The findings of the study on the biocompatibility of Cs/Ni/NiO HNPs on the L929 cell lines showed a non-cytotoxic tendency toward normal cells. As a result, the report demonstrated that the chemically engineered Cs/Ni/NiO HNPs have biological properties that are effective against MDR pathogenic bacteria and carcinoma cells. More research is, however, needed to ascertain whether improving the morphology of these Cs/Ni/NiO HNPs will enhance their antibacterial and anticancer properties. |
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1144-0546 |
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WOS:000814528600001 |
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UAI @ alexi.delcanto @ |
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1608 |
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Kumar, M.P.; Sasikumar, M.; Arulraj, A.; Rajasudha, V.; Murugadoss, G.; Kumar, M.R.; Peera, S.G.; Mangalaraja, R.V. |
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NiFe Layered Double Hydroxide Electrocatalyst Prepared via an Electrochemical Deposition Method for the Oxygen Evolution Reaction |
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2022 |
Publication |
Catalysts |
Abbreviated Journal |
Catalysts |
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12 |
Issue |
11 |
Pages |
1470 |
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OER; NiFe-LDH electrocatalyst; electrochemical deposition; (Oxy)hydroxides phases; long-time stability |
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Abstract |
Herein, we aimed to obtain NiFe layered double hydroxide (LDH) with a controlled phase and surface morphology as a highly active and stable oxygen evolution catalyst via the electrochemical deposition method, which was thermodynamically stable for the oxygen evolution reaction (OER) in an alkaline medium. The NiFe-LDH sample was analyzed by sophisticated instruments and tested as an electrocatalyst on Toray carbon (TC). The NiFe-LDH electrocatalyst showed an excellent performance with lower overpotential of 0.27 V at 35 mA cm(-2) and higher density of 125 mA cm(-2) for OER in the 1 M KOH electrolyte solution. Moreover, the prepared catalyst exhibited unpredictable long-time stability for 700 h. From our knowledge, NiFe-LDH is a robust highly stable electrocatalyst compared to the recent reports. |
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2073-4344 |
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WOS:000894739800001 |
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UAI @ alexi.delcanto @ |
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1680 |
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Kumar, N.; Gajraj, V.; Rameshbabu, R.; Mangalaraja, R.V.; Joshi, N.C.; Priyadarshi, N. |
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Redox additive electrolyte assisted promising pseudocapacitance from strictly 1D and 2D blended structures of MnO2/rGO |
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2022 |
Publication |
Materials Characterization |
Abbreviated Journal |
Mater. Charact. |
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189 |
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Pages |
111991 |
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Nanocomposite; Reduced graphene oxide; Redox; Charge; Energy |
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A promising sustainable energy storage characteristic is achieved in redox additive electrolyte by developing strict blend of one dimensional (1D) and two dimensional (2D) structures. Hydrothermal reaction is followed to obtain the desired morphology. Two dimensional (2D) reduced graphene oxide (rGO) is added into the redox reaction between potassium permanganate and sodium nitrite to obtain nanocomposite comprising 1D and 2D blended structures of MnO2/rGO. Their structures and morphologies are studied by XRD, Raman and HRTEM analyses, respectively. The pseudocapacitive behaviour is studied in a redox additive electrolyte comprising KOH and K3Fe(CN)(6). The effect of electrolytic concentration was studied by varying the concentration of K3Fe(CN)6. The specific capacity is considerably enhanced up to 1741 F/g, 8.75 A/g with increase in concentration of K3Fe (CN)6. The role of redox couple [Fe(CN)(6)](3)-/[Fe(CN)(6)](4)-played a key role in adding the charge movement across the electrode which tuned well with the manganese ions to obtain one of the most promising pseudo-capacitances from the developed 1D and 2D blended structures of MnO2/rGO. For in-depth analysis of Fe ions movement, a symmetric supercapacitor cell is constructed to achieve a commendable specific capacitance of 216 F/g at 3.75 A/g. Prolong cycling hinted decreasing electrolytic interfacial layers resulting in fast reversible ki-netics of Fe(III) -> Fe(II) ions to achieve astonishing capacity retention of 127% after 3000 cycles. |
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1044-5803 |
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WOS:000811910000006 |
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UAI @ alexi.delcanto @ |
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1602 |
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Kumaresan, N.; Alsalhi, M.S.; Karuppasamy, P.; Kumar, M.P.; Pandian, M.S.; Arulraj, A.; Peera, S.G.; Mangalaraja, R.V.; Devanesan, S.; Ramasamy, P. |
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Nitrogen implanted carbon nanosheets derived from Acorus calamus as an efficient electrode for the supercapacitor application |
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2023 |
Publication |
Molecular Catalysis |
Abbreviated Journal |
Mol. Catal. |
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538 |
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112978 |
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Acorus Calamus; Hydrothermal; Carbonization, Porous structures, Electrochemical double layer capacitance; Supercapacitor |
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Modern society's biggest challenges are affordable, clean energy production and storage. Thus, recent research aims at the discovery of novel electrode materials for enhanced energy production and storage. Herein, nitrogen-implanted carbon particles were synthesized for the first time from the Acorus Calamus for the symmetric supercapacitor application. The KOH-activated carbon particles at 750 degrees C (C-750) under a nitrogen atmosphere revealed the better structural, textural, morphological, and electrochemical performance. The BET analysis confirmed that the C-750 carbon nanoparticles tremendously enhanced the surface area of about 3551.07 m(2)/g. Further, the pore size and pore volume were obtained from BJH analysis that showed 3.70 nm and 0.51 cc/g, respectively. The high surface area along with the mesoporous nature of the C-750 sample effectively enhanced the specific capacitance to 354.44 Fg(-1) at 1 Ag-1 using a 6 M KOH electrolytic solution. Further, the enhancement of energy and power density of the C-750 was observed at about 47.2 Whkg(-1) and 16,000 Wkg(-1), respectively. |
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2468-8231 |
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WOS:000927527600001 |
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UAI @ alexi.delcanto @ |
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1754 |
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Kumaresan, N.; Karuppasamy, P.; Kumar, M.P.; Peera, S.G.; AlSalhi, M.S.; Devanesan, S.; Mangalaraja, R.V.; Ramasamy, P.; de Oliveira, T.F.; Murugadoss, G. |
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Synthesis and characterization of metal-free nanosheets of carbo-catalysts for bifunctional electrocatalyst towards HER and OER application |
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2023 |
Publication |
Molecular Catalysis |
Abbreviated Journal |
Mol. Catal. |
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539 |
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113043 |
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Acorus Calamus; Carbonization; Nanosheets; Mesoporous; Bifunctional electrocatalysts |
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Production of “green hydrogen” through water electrolysis is attracting considerable attention in recent years, due to the high demand for green energy technologies. The efficiency of water electrolysis depends on the electrocatalytic activity of anodic and cathodic electrocatalysts. Currently, utilizing Pt and RuO2-based elec-trocatalysts is expensive in terms of commercial aspects. Therefore, growing research for inventing efficient and cheap electrocatalysts is undergoing rigorously. In this work, we have synthesized, biomass-derived electro-catalysts with intrinsically implanted heteroatoms as hydrogen and oxygen evolution reactions in alkaline electrolytes. The biomass carbon catalyst is derived from the carbonation of the Acorus Calamus plant “root”. The derived carbon is activated by KOH treatment (C-750). The resultant carbon powder is characterized by various physiochemical and electrochemical characterization techniques. The C-750 catalyst is found to have excellent morphology, surface area (3488 m2/g), pore size (4.08 nm), pore volume (1.10 cc/g), and intrinsically doped N. The HRTEM analysis of C-750 reveals well-distributed microporous and graphitic surfaces. When used as an electrocatalyst for HER and OER analysis, the C-750 exhibited appreciable electrocatalytic activity with an overpotential of-0.330 V and 0.563 V vs. RHE, respectively at the current density of-10.0 mA/cm2. In addition, the C-750 catalyst also showed excellent stability with almost zero degradation in a chronoamperometric measurement carried out for 10 hrs. |
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2468-8231 |
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WOS:000949823100001 |
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UAI @ alexi.delcanto @ |
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1774 |
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Nandhakumar, E.; Selvakumar, P.; Arulraj, A.; Vivek, E.; Venkatraman, M.R.; Sasikumar, A.; Kumar, M.P.; Mangalaraja, R.V.; Kamatchi, R.; Senthilkumar, N. |
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Investigation on rod like SnO2@CdCO3 nanocomposite-based electron transport layer for CsPbBr3 heterojunction perovskite solar cell applications br |
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2023 |
Publication |
Materials Letters |
Abbreviated Journal |
Mater. Lett. |
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330 |
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133396 |
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Tin oxide; Dual electron transport layer; PSCs; Solar energy materials; Nanocomposites |
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A novel carbonate-based nanocomposite synthesized by hydrothermal technique for planar perovskite solar cells (PPSCs) applications. According to this study, SnO2@CdCO3and SnO2/SnO2@CdCO3 performs as dual electron transporting layers for CsPbBr3 based perovskite solar cell. The fabricated PSCs with architecture of FTO/SnO2/ SnO2@CdCO3/CsPbBr3/C showed a Voc of 0.84 V, Jsc of 12.30 mA cmi 2, PCE of 6.67 % and FF of 0.64 are obtained at ambient condition. |
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0167-577X |
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WOS:000885762500007 |
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UAI @ alexi.delcanto @ |
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1662 |
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Pabba, D.P.; Rao, B.V.B.; Thiam, A.; Kumar, M.P.; Mangalaraja, R.V.; Udayabhaskar, R.; Aepuru, R.; Thirumurugan, A. |
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Flexible magnetoelectric PVDF-CoFe2O4 fiber films for self-powered energy harvesters |
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2023 |
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Ceramics International |
Abbreviated Journal |
Ceram. Int. |
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49 |
Issue |
19 |
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31096-31105 |
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Magnetoelectric; Energy harvesting; CoFe 2 O 4 fibers; PVDF |
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Integrating the concept of magnetoelectric in the mechanical energy harvesters through the magneto-mechanoelectrical (MME) nanogenerators has been explored to realize the self-powered devices. The magnetoelectric interaction enabled the output performance of the MME nanogenerator under magnetic stimulus of the active components of the energy harvesters. In this perspective, we fabricated a flexible biomechanical and MME nanogenerator using PVDF/CoFe2O4 fibers composite films. CoFe2O4 fibers were synthesized by the electrospinning technique and the process parameters were optimized to achieve uniform and bead-free fibers. The structural and morphological properties were investigated through scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The structural and morphology revealed the fibers calcined at 800 degrees C with a heating rate of 2 degrees C/min produced bead-free continuous fibers with a fiber diameter of 210 nm with cubic spinel crystalline structure with a crystallite size of 34 nm. These highly crystalline fibers were used to fabricate PVDF/CoFe2O4 fibers composite films. The magnetoelectric behaviour of the films verified through polarization vs. electric field (P-E) loops under magnetic field. The leakage current density and mechanism of the composite films were investigated, and it was discovered that the mechanism was due to Schottky emission. Further the energy harvesting performance of the composite films were estimated where the nanogenerator achieved an output voltage of 13 V under biomechanical tapping force while the MME nanogenerator produced 3.5 V under a low frequency stray magnetic field of 6 Oe with a power density of 28 & mu;W/m2. |
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0272-8842 |
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WOS:001054171300001 |
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UAI @ alexi.delcanto @ |
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1867 |
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Pabba, D.P.; Satthiyaraju, M.; Ramasdoss, A.; Sakthivel, P.; Chidhambaram, N.; Dhanabalan, S.; Abarzua, C.V.; Morel, M.J.; Udayabhaskar, R.; Mangalaraja, R.V.; Aepuru, R.; Kamaraj, S.K.; Murugesan, P.K.; Thirumurugan, A. |
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MXene-Based Nanocomposites for Piezoelectric and Triboelectric Energy Harvesting Applications |
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2023 |
Publication |
Micromachines |
Abbreviated Journal |
Micromachines |
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14 |
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6 |
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1273 |
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MXene; energy harvesting; composite materials; piezoelectric; triboelectric nanogenerator |
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Due to its superior advantages in terms of electronegativity, metallic conductivity, mechanical flexibility, customizable surface chemistry, etc., 2D MXenes for nanogenerators have demonstrated significant progress. In order to push scientific design strategies for the practical application of nanogenerators from the viewpoints of the basic aspect and recent advancements, this systematic review covers the most recent developments of MXenes for nanogenerators in its first section. In the second section, the importance of renewable energy and an introduction to nanogenerators, major classifications, and their working principles are discussed. At the end of this section, various materials used for energy harvesting and frequent combos of MXene with other active materials are described in detail together with the essential framework of nanogenerators. In the third, fourth, and fifth sections, the materials used for nanogenerators, MXene synthesis along with its properties, and MXene nanocomposites with polymeric materials are discussed in detail with the recent progress and challenges for their use in nanogenerator applications. In the sixth section, a thorough discussion of the design strategies and internal improvement mechanisms of MXenes and the composite materials for nanogenerators with 3D printing technologies are presented. Finally, we summarize the key points discussed throughout this review and discuss some thoughts on potential approaches for nanocomposite materials based on MXenes that could be used in nanogenerators for better performance. |
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WOS:001017369800001 |
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UAI @ alexi.delcanto @ |
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1825 |
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Author |
Pandiyarajan, T.; Mangalaraja, R.V.; Karthikeyan, B.; Arulraj, A.; Gracia-Pinilla, M.A. |
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Fabrication and spectroscopic investigation of sandwich-like ZnO:rGO:ZnO: rGO:ZnO structure by layer-by-layer approach |
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2023 |
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Inorganic Chemistry Communications |
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Inorg. Chem. Commun. |
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149 |
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110383 |
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Layer-by-layer; Reduced graphene oxide; ZnO; Spin coating; Transmission; Photoluminescence |
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Abstract |
Transparent conducting materials (TCMs) are the heart of modern optoelectronic industries and the properties of TCMs could be improved by the introduction of 2D carbon materials. In this report, the influence of order layering on microstructural, transparency and emission characteristics of ZnO:rGO:ZnO:rGO:ZnO and rGO:ZnO: rGO:ZnO:rGO sandwich structures has been investigated. The layer-by-layer approach has been adopted for the fabrication of sandwich structured materials ZnO:rGO:ZnO:rGO:ZnO and rGO:ZnO:rGO:ZnO:rGO through the spin coating technique. The sandwich structures of ZnO and rGO exhibited hexagonal wurtzite structure of ZnO without any impurities were identified through XRD. The ordering of layer's influenced the microstructural parameters and were significantly altered. The spherical nature of the particles and the formation of the sand-wich structures were confirmed by using SEM micrograph. The reduction in an optical transparency and nar-rowing bandgap of the ZnO upon the order of layering were identified through transmission spectra. The lower energy shift of near band edge (NBE) emission and reduction in the emission intensity with respect to pure ZnO nanostructures was observed. The present work provides a simple layer-by-layer approach to fabricating sand-wich structures and improving the optical properties which have potential applications in various optoelectronic devices. |
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1387-7003 |
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WOS:000915788900001 |
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UAI @ alexi.delcanto @ |
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1723 |
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