Reaction environment impacts charge transfer but not chemical reaction steps in hydrogen evolution catalysis
Reaction environment impacts charge transfer but not chemical reaction steps in hydrogen evolution catalysis
复制标题
反应环境影响电荷转移,但不影响析氢催化中的化学反应步骤
DOI:
10.1038/s41929-023-00943-2
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发表时间:
2023
期刊:
影响因子:
37.8
通讯作者:
Surendranath, Yogesh
中科院分区:
文献类型:
--
作者:
Tang, Bryan Y.;Bisbey, Ryan P.;Lodaya, Kunal M.;Toh, Wei Lun;Surendranath, Yogesh
Interfacial electrocatalysis involves elementary chemical and charge transfer reaction steps. For the hydrogen evolution reaction (HER), the applied overpotential can be partitioned into a charge transfer overpotential, which drives proton-coupled electron transfer, and a chemical overpotential arising from increasing surface H activity. However, typical experiments report on the aggregate rate–overpotential profile, with no information about the relative contributions from these two components. Herein, we employ a Pd membrane double cell to spatially isolate charge transfer and chemical reaction steps in HER catalysis, deconvoluting their overpotential contribution under different reaction conditions. We analyse how pH and the introduction of poisons and promoters affect each component, and find that for a given H2release rate, only the charge transfer overpotential is affected by reaction conditions. These findings suggest that reaction-condition-dependent HER efficiencies are driven predominantly by changes to the charge transfer kinetics rather than the chemical reactivity of surface H.
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