非阻塞I/O
催化作用
X射线光电子能谱
过渡金属
析氧
石英晶体微天平
碱土金属
无机化学
化学
杂质
金属
电解质
锰
氧气
材料科学
化学工程
物理化学
电极
电化学
吸附
工程类
生物化学
有机化学
作者
Michaela S. Burke,Shihui Zou,Lisa J. Enman,Jaclyn E. Kellon,Christian A. Gabor,Erica Pledger,Shannon W. Boettcher
标识
DOI:10.1021/acs.jpclett.5b01650
摘要
First-row transition-metal oxides and (oxy)hydroxides catalyze the oxygen evolution reaction (OER) in alkaline media. Understanding the intrinsic catalytic activity provides insight into improved catalyst design. Experimental and computationally predicted activity trends, however, have varied substantially. Here we describe a new OER activity trend for nominally oxyhydroxide thin films of Ni(Fe)O(x)H(y) > Co(Fe)O(x)H(y) > FeO(x)H(y)-AuO(x) > FeO(x)H(y) > CoO(x)H(y) > NiO(x)H(y) > MnO(x)H(y). This intrinsic trend has been previously obscured by electrolyte impurities, potential-dependent electrical conductivity, and difficulty in correcting for surface-area or mass-loading differences. A quartz-crystal microbalance was used to monitor mass in situ and X-ray photoelectron spectroscopy to measure composition and impurity levels. These new results provide a basis for comparison to theory and help guide the design of improved catalyst systems.
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