化学
催化作用
镍
动力学
电化学
析氧
氧化还原
过渡金属
氧气
化学动力学
反应速率常数
活化能
分析化学(期刊)
金属
无机化学
物理化学
电极
物理
有机化学
量子力学
生物化学
色谱法
作者
Hyun S. Ahn,Allen J. Bard
摘要
Nickel-iron mixed metal oxyhydroxides have attracted significant attention as an oxygen evolution reaction (OER) catalyst for solar fuel renewable energy applications. Here, we performed surface-selective and time-dependent redox titrations to directly measure the surface OER kinetics of Ni(IV) and Fe(IV) in NiOOH, FeOOH, and Ni(1-x)Fe(x)OOH (0 < x < 0.27) electrodes. Most importantly, two types of surface sites exhibiting "fast" and "slow" kinetics were found, where the fraction of "fast" sites in Ni(1-x)Fe(x)OOH matched the iron atom content in the film. This finding provides experimental support to the theory-proposed model of active sites in Ni(1-x)Fe(x)OOH. The OER rate constant of the "fast" site was 1.70 s(-1) per atom.
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