Cited by 123Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceCO2 Reduction Techniques and Catalysts

Inverse kinetic isotope effects in the oxygen reduction reaction at platinum single crystals

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Yang, Yao, Agarwal, Rishi G., Hutchison, Phillips, Rizo, Rubén, Soudackov, Alexander V., Lu, Xinyao, Herrero, Enrique, Feliu, Juan M. +3 more·2023·Nature Chemistry

Abstract

Although the oxygen reduction reaction (ORR) involves multiple proton-coupled electron transfer processes, early studies reported the absence of kinetic isotope effects (KIEs) on polycrystalline platinum, probably due to the use of unpurified D 2 O. Here we developed a methodology to prepare ultra-pure D 2 O, which is indispensable for reliably investigating extremely surface-sensitive platinum single crystals. We find that Pt(111) exhibits much higher ORR activity in D 2 O than in H 2 O, with potential-dependent inverse KIEs of ~0.5, whereas Pt(100) and Pt(110) exhibit potential-independent inverse KIEs of ~0.8. Such inverse KIEs are closely correlated to the lower *OD coverage and weakened *OD binding strength relative to *OH, which, based on theoretical calculations, are attributed to the differences in their zero-point energies. This study suggests that the competing adsorption between *OH/*OD and *O 2 probably plays an important role in the ORR rate-determining steps that involve a chemical step preceding an electrochemical step (CE mechanism).

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Crossref · 10.1038/s41557-022-01084-y

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  • Inverse KIE behavior reported for oxygen reduction on Pt single crystals is attributed to weaker *OD binding and reduced *OD surface coverage relative to *OH, arising from competitive adsorption effects.

    “Similar inverse KIE behavior has been reported for oxygen reduction on Pt single crystals and has been attributed to weaker *OD binding and reduced *OD surface coverage relative to *OH, arising from competitive adsorption effects.56”

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Authors
Yang, Y., Agarwal, R. G., Hutchison, P., Rizo, R., Soudackov, A. V., Lu, X., Herrero, E., Feliu, J. M., Hammes-Schiffer, S., Mayer, J. M., & Abruña, H. D.
Affiliations
  • Cornell University (US)
  • Yale University (US)
  • University of Alicante (ES)
Venue
Nature Chemistry
Published
2022-11-10
Volume
15
Issue
2
Pages
271-277
ISSN
  • 1755-4330 (ISSN-L)
  • 1755-4349
OpenAlex
W4308772436
Cited by
123
References
0
Citations by year
2026: 27 · 2025: 40 · 2024: 39 · 2023: 17
FWCI
4.33
Type
journal article
Language
en
Open access
Locations
  • Nature Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • RUA, Repositorio Institucional de la Universidad de Alicante (Universidad de Alicante) (submittedVersion)
Funders
  • U.S. Department of Defense (FA95501810497, FA95501810420)
  • U.S. Department of Energy (DESC0019445)
  • Ministerio de Ciencia e Innovación
  • Multidisciplinary University Research Initiative (FA9550-18-1-0420)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
  • Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
Keywords
inverse kinetic isotope effect, oxygen reduction reaction, platinum single crystals, reaction mechanism, electrocatalysis, hydrogen evolution reaction

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