Operando Analysis of NiFe and Fe Oxyhydroxide Electrocatalysts for Water Oxidation: Detection of Fe4+ by Mossbauer Spectroscopy

被引：732

作者：

Chen, Jamie Y. C. ^{[1
]}

Dang, Lianna ^{[1
]}

Liang, Hanfeng ^{[1
]}

Bi, Wenli ^{[2
]}

Gerken, James B. ^{[1
]}

Jin, Song ^{[1
]}

Alp, E. Ercan ^{[2
]}

Stahl, Shannon S. ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA

[2] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2015年 / 137卷 / 48期

基金：

美国国家科学基金会;

关键词：

OXYGEN EVOLUTION REACTION; ELECTROCHEMICAL-BEHAVIOR; NICKEL-HYDROXIDE; OXIDE CATALYSTS; IRON; ELECTRODES; FILMS; NANOSHEETS; COBALT; IONS;

D O I：

10.1021/jacs.5b10699

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nickel-iron oxides/hydroxides are among the most active electrocatalysts for the oxygen evolution reaction. In an effort to gain insight into the role of Fe in these catalysts, we have performed operando Mossbauer spectroscopic studies of a 3:1 Ni:Fe layered hydroxide and a hydrous Fe oxide electrocatalyst. The catalysts were prepared by a hydrothermal precipitation method that enabled catalyst growth directly on carbon paper electrodes. Fe4+ species were detected in the NiFe hydroxide catalyst during steady-state water oxidation, accounting for up to 21% of the total Fe. In contrast, no Fe's was detected in the Fe oxide catalyst. The observed Fe4+ species are not kinetically competent to serve as the active site in water oxidation; however, their presence has important implications for the role of Fe in NiFe oxide electrocatalysts.

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页码：15090 / 15093

页数：4

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