Repository Community: null
http://hdl.handle.net/20.500.11750/235
2024-03-29T12:13:42Z
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Polyoxometalate decorated graphene oxide/sulfonated poly(arylene ether ketone) block copolymer composite membrane for proton exchange membrane fuel cell operating under low relative humidity
http://hdl.handle.net/20.500.11750/56366
Title: Polyoxometalate decorated graphene oxide/sulfonated poly(arylene ether ketone) block copolymer composite membrane for proton exchange membrane fuel cell operating under low relative humidity
Author(s): Oh, Kwangjin; Son, Byungrak; Sanetuntikul, Jakkid; Shanmugam, Sangaraju
Abstract: A phosphotungstic acid (PW) decorated graphene oxide (GO) is explored as a filler for sulfonated poly(arylene ether ketone) (SPAEK) block copolymer. The SPAEK/PW-mGO composite membrane shows higher proton conductivity than a pristine SPAEK membrane. At 80°C under 25% relative humidity (RH) condition, the fuel cell configured with the SPAEK/PW-mGO composite membrane shows improved fuel cell performance. A maximum power density of 772mWcm−2 is observed for the SPAEK/PW-mGO composite membrane, whereas the pristine SPAEK membrane exhibits a maximum power density of 10mWcm−2 operated under 25% RH at 80°C. Compared with the NRE-212 membrane, the SPAEK/PW-mGO composite membrane exhibits 4.8-times higher maximum power density. Furthermore, the maximum current density of the SPAEK/PW-mGO composite membrane (2271mAcm−2) is much higher than pristine SPAEK (39mAcm−2) and NRE-212 (734mAcm−2) membranes. © 2017 Elsevier B.V.
2017-10-31T15:00:00Z
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다공성 다중-금속산화물 나노튜브 및 이의 제조 방법
http://hdl.handle.net/20.500.11750/48132
Title: 다공성 다중-금속산화물 나노튜브 및 이의 제조 방법
Author(s): 박주안; 상가라쥬샨무감
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Electrochemical synthesis of ammonia from nitric oxide in a membrane electrode assembly electrolyzer over a dual Fe-Ni single atom catalyst
http://hdl.handle.net/20.500.11750/47748
Title: Electrochemical synthesis of ammonia from nitric oxide in a membrane electrode assembly electrolyzer over a dual Fe-Ni single atom catalyst
Author(s): Markandaraj, Sridhar Sethuram; Dhanabal, Dinesh; Shanmugam, Sangaraju
Abstract: Membrane electrode assembly (MEA) electrolyzers offer a means to scale up nitric oxide (NO)-to-ammonia (NH3) electro-conversion assisted by renewable electricity and bring the anthropogenic nitrogen cycle back into balance. Herein, we show that atomically dispersed dual Fe, Ni atom embedded nitrogen-doped carbon nanotube (FeNi-NCNT) electrodes produce NH3 readily with a low overpotential of 210 mV, among the lowest overpotentials reported for the electrosynthesis of NH3 from NO. The FeNi-NCNT catalyst attains a high NH3 faradaic efficiency (FENH) of 92.6% at −0.5 VRHE. The high selectivity of FeNi-NCNT is believed to result from Ni sites lowering the activation energy and offering a stable intermediate during NH3 formation. While integrating FeNi-NCNT in the MEA electrolyzer, high FENH of up to 83.6% was achieved at a current density of of about 71 mA cm−2, presenting steady electrolysis over 50 h. This work guides employing dual-atom catalysts in MEA electrolyzer applications for efficient feedstock production. © 2023 The Royal Society of Chemistry.
2023-10-31T15:00:00Z
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Recent advances in electrocatalytic NOx reduction into ammonia
http://hdl.handle.net/20.500.11750/47730
Title: Recent advances in electrocatalytic NOx reduction into ammonia
Author(s): Inta, Harish Reddy; Dhanabal, Dinesh; Markandaraj, Sridhar Sethuram; Shanmugam, Sangaraju
Abstract: Ammonia (NH3) is an essential ingredient for the production of numerous chemicals which have a wider usage as fertilizers, explosives, and plastics. Currently, NH3 is mainly produced from the conventional Haber–Bosch process, which is energy-consuming and involves the risk of emitting greenhouse gases into the atmosphere. In contrast, electrochemical ammonia synthesis (EAS) from the nitrogen reduction reaction is evolving as a viable solution for sustainable NH3 production under ambient conditions. However, the high N[triple bond, length as m-dash]N dissociation energy and the competitive hydrogen evolution reaction result in an unsatisfactory ammonia yield rate and Faradaic efficiency. In this regard, EAS from reactive nitrogen (NOx) species, especially through the nitric oxide reduction reaction (NORR), could be a sustainable way as it produces valuable NH3 and simultaneously mitigates the gaseous NOx pollutant. Various NORR electrocatalysts have been designed and investigated. The electrocatalytic activity hugely depends on the composition, Gibbs free energy for ‘NO’ or intermediate adsorption on the catalyst surface, and the rate of proton/electron transfer at the solid–liquid–gas interface. Besides, different electrolyte additives have been employed to improve the solubility of NO in aqueous electrolytes. Thus, this review presents an overview of the NORR mechanism, recent advancements in electrocatalysts, and factors influencing the NH3 yield and selectivity. After that, the forthcoming challenges associated with practical realisation of EAS via NORR are discussed. © 2023 The Royal Society of Chemistry
2023-05-31T15:00:00Z