Observation of an Inverse Kinetic Isotope Effect in Oxygen Evolution Electrochemistry
Observation of an Inverse Kinetic Isotope Effect in Oxygen Evolution Electrochemistry
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DOI：
10.1021/acscatal.6b01170
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发表时间：
2016-09-01
期刊：
影响因子：
12.9
通讯作者：
Gewirth, Andrew A.
中科院分区：
文献类型：
--
作者：
Tse, Edmund C. M.;Hoang, Thao T. H.;Gewirth, Andrew A.
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.
