Electrooxidation of hydrazine utilizing high-entropy alloys: assisting the oxygen evolution reaction at the thermodynamic voltage

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dc.contributor.author Katiyar, Nirmal Kumar
dc.contributor.author Dhakar, Shikha
dc.contributor.author Parui, Arko
dc.contributor.author Gakhad, Pooja
dc.contributor.author Singh, Abhishek Kumar
dc.contributor.author Biswas, Krishanu
dc.contributor.author Tiwary, Chandra Sekhar
dc.contributor.author Sharma, Sudhanshu
dc.coverage.spatial United States of America
dc.date.accessioned 2021-11-24T13:31:13Z
dc.date.available 2021-11-24T13:31:13Z
dc.date.issued 2021-11
dc.identifier.citation Katiyar, Nirmal Kumar; Dhakar, Shikha; Parui, Arko; Gakhad, Pooja; Singh, Abhishek Kumar; Biswas, Krishanu; Tiwary, Chandra Sekhar and Sharma, Sudhanshu, "Electrooxidation of hydrazine utilizing high-entropy alloys: assisting the oxygen evolution reaction at the thermodynamic voltage", ACS Catalysis, DOI: 10.1021/acscatal.1c03571, vol. 11, no. 22, pp. 14000-14007, Nov. 2021. en_US
dc.identifier.issn 2155-5435
dc.identifier.uri http://dx.doi.org/10.1021/acscatal.1c03571
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/7283
dc.description.abstract Hydrazine electrooxidation is an important reaction as it assists in decreasing the OER overvoltage. Herein, we report the utilization of a high-entropy nanocatalyst alloy for the electrooxidation of hydrazine. The high-entropy nanocatalyst comprising five elements (Ag, Au, Pt, Pd, Cu) shows profound activity toward this molecule at a low overvoltage. An intriguingly high-entropy nanocatalyst prepared by the casting-cum-cryomilling method is endowed with the unique catalytic activity for the HzOR. A detailed analysis of gaseous product points to the formation of nitrogen as well as oxygen as the oxidation product, a sign of accompanying the oxygen evolution reaction (OER). Interestingly, a significant amount of oxygen is detected at 1.13 V (reversible hydrogen electrode (RHE)) in a neutral buffered medium, confirming that the OER is functional at a voltage near the thermodynamic voltage of 1.23 V (RHE). The quantitative contribution of each hydrazine and OER is ascertained, which explains a vital insight into this reaction. Density functional theory calculations showed that both HzOR and OER assist each other where the electron-donating effect of H2O to the surface can reduce the endothermicity of the HzOR. However, the electron acceptance of *NHNH2 helps in a favorable overlap of the HEA Fermi level and vacant states with the HOMO of H2O.
dc.description.statementofresponsibility by Nirmal Kumar Katiyar, Shikha Dhakar, Arko Parui, Pooja Gakhad, Abhishek Kumar Singh, Krishanu Biswas, Chandra Sekhar Tiwary and Sudhanshu Sharma
dc.format.extent vol. 11, no. 22, pp. 14000-14007
dc.language.iso en_US en_US
dc.publisher American Chemical Society en_US
dc.subject High-entropy alloy en_US
dc.subject Nanoparticles en_US
dc.subject Nanocatalysis en_US
dc.subject Hydrazine oxidation en_US
dc.subject Microscopy analysis en_US
dc.subject Oxygen evolution reaction en_US
dc.title Electrooxidation of hydrazine utilizing high-entropy alloys: assisting the oxygen evolution reaction at the thermodynamic voltage en_US
dc.type Article en_US
dc.relation.journal ACS Catalysis


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