Journal
ACS CATALYSIS
Volume 6, Issue 9, Pages 5706-5714Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b01170
Keywords
electrocatalysis; water oxidation; oxygen evolution reaction; kinetic isotope effect; nonprecious metal; proton-coupled electron transfer; reaction mechanism
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Funding
- Croucher Foundation
- Chemistry Department at the University of Illinois at Urbana-Champaign
- National Science Foundation [CHE-1309731]
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Earth-abundant and inexpensive catalysts with low overpotential and high durability are central to the development of efficient water-splitting electrolyzers. However, improvements in catalyst design and preparation are currently hampered by the lack of a detailed understanding of the reaction mechanisms of the oxygen evolution reaction (OER) facilitated by nonprecious-metal (NPM) catalysts. In this paper, we conducted a kinetic isotope effect (KIE) study in an effort to identify the rate-determining step (RDS) of these intricate electrocatalytic reactions involving multiple proton-coupled electron transfer (PCET) processes. We observed an inverse KM for OER catalyzed by Ni and Co electrodes. These results contribute to a more complete understanding of the OER mechanism and allow for the future development of improved NPM catalysts.
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