A1 Journal article (refereed)
Cations Determine the Mechanism and Selectivity of Alkaline Oxygen Reduction Reaction on Pt(111) (2023)


Kumeda, T., Laverdure, L., Honkala, K., Melander, M. M., & Sakaushi, K. (2023). Cations Determine the Mechanism and Selectivity of Alkaline Oxygen Reduction Reaction on Pt(111). Angewandte Chemie, 62(51), Article e202312841. https://doi.org/10.1002/anie.202312841


JYU authors or editors


Publication details

All authors or editorsKumeda, Tomoaki; Laverdure, Laura; Honkala, Karoliina; Melander, Marko M.; Sakaushi, Ken

Journal or seriesAngewandte Chemie

ISSN1433-7851

eISSN1521-3773

Publication year2023

Publication date20/11/2023

Volume62

Issue number51

Article numbere202312841

PublisherWiley-VCH Verlag

Publication countryGermany

Publication languageEnglish

DOIhttps://doi.org/10.1002/anie.202312841

Publication open accessOpenly available

Publication channel open accessPartially open access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/92133

Web address of parallel published publication (pre-print)https://arxiv.org/abs/2205.00719


Abstract

The proton-coupled electron transfer (PCET) mechanism of the oxygen reduction reaction (ORR) is a long-standing enigma in electrocatalysis. Despite decades of research, the factors determining the microscopic mechanism of ORR-PCET as a function of pH, electrolyte, and electrode potential remain unresolved, even on the prototypical Pt(111) surface. Herein, we integrate advanced experiments, simulations, and theory to uncover the mechanism of the cation effects on alkaline ORR on well-defined Pt(111). We unveil a dual-cation effect where cations simultaneously determine i) the active electrode surface by controlling the formation of Pt−O and Pt−OH overlayers and ii) the competition between inner- and outer-sphere PCET steps. The cation-dependent transition from Pt−O to Pt−OH determines the ORR mechanism, activity, and selectivity. These findings provide direct evidence that the electrolyte affects the ORR mechanism and performance, with important consequences for the practical design of electrochemical systems and computational catalyst screening studies. Our work highlights the importance of complementary insight from experiments and simulations to understand how different components of the electrochemical interface contribute to electrocatalytic processes.


Keywordsoxidation-reduction reactionreduction (chemistry)electrocatalysisplatinumsurface chemistryelectrochemistry

Free keywordsconstrained DFT; electrocatalysis; energy conversion; kinetic isotope effects; Marcus theory


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Ministry reportingYes

Reporting Year2023

Preliminary JUFO rating3


Last updated on 2024-03-04 at 21:56