Temperature Dependence of Oxygen Evolution Reaction Activity in Alkaline Solution at Ni–Co Oxide Catalysts with Amorphous/Crystalline Surfaces

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(22), P. 14209 - 14219

Published: Nov. 4, 2022

The development of high-performance oxygen evolution reaction (OER) catalysts based on earth-abundant transition metal oxides as alternatives to precious is being pursued intensively for the large-scale application alkaline water electrolysis hydrogen production. Active OER electrocatalysts can be designed basis fundamental insights into catalytic phenomena occurring surfaces. In particular, temperature dependence activity a measure energies/barriers needs characterized by taking account operating (60–80 °C) practical electrolyzer. this work, we synthesized Ni–Co oxide solid solution flame pyrolysis method, with particular emphasis catalysis, way elucidate reactions, from both experimental and theoretical perspectives. as-prepared structured conductive alloys were heat-treated at different temperatures in presence O2 regulate crystallinity has been evaluated 20 80 °C 1 M KOH, kinetic current density was found increase increasing all obtained. Interestingly, Ni–Co/oxide materials amorphous or poorly crystalline surfaces showed superior (3–8 times higher surface-specific 1.55 V vs reversible electrode (RHE)) than their counterparts temperatures. activation energy also decreased decrease phases. It demonstrated that catalyst could readily activated form active oxyhydroxides under conditions. disordered structure surface low-coordinated sites proposed render geometry energetically favorable rate-determining step O + OH → OOH, which accelerates kinetics thus improves activity, explained functional theory calculations.

Language: Английский

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Synergistically coupling Pt with Ni towards accelerated water dissociation for enhanced alkaline hydrogen evolution

Journal of Materials Chemistry A, Journal Year: 2022, Volume and Issue: 10(26), P. 13727 - 13734

Published: Jan. 1, 2022

The developed PtNi-NC-900 demonstrated superior activity and durability to the commercial 20% Pt/C catalyst for alkaline hydrogen evolution reaction, due synergistic effect between Pt Ni atoms on accelerated water dissociation.

Language: Английский

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Defect-rich graphene skin modified carbon felt as a highly enhanced electrode for vanadium redox flow batteries

Journal of Power Sources, Journal Year: 2022, Volume and Issue: 556, P. 232443 - 232443

Published: Nov. 30, 2022

Language: Английский

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Dynamic active sites in NiFe oxyhydroxide upon Au nanoparticles decoration for highly efficient electrochemical water oxidation

Nano Energy, Journal Year: 2022, Volume and Issue: 98, P. 107328 - 107328

Published: May 5, 2022

Language: Английский

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Unveiling anion induced surface reconstruction of perovskite oxide for efficient water oxidation

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 330, P. 122661 - 122661

Published: March 20, 2023

Language: Английский

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