A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes

被引：274

作者：

Mi, Qixi ^{[1
]}

Zhanaidarova, Almagul

Brunschwig, Bruce S.

Gray, Harry B.

Lewis, Nathan S.

机构：

[1] CALTECH, Beckman Inst, Pasadena, CA 91125 USA

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2012年 / 5卷 / 02期

基金：

美国国家科学基金会;

关键词：

TUNGSTEN TRIOXIDE; PHOTOASSISTED ELECTROLYSIS; NANOSTRUCTURED ALPHA-FE2O3; OXYGEN EVOLUTION; MESOPOROUS WO3; PHOTOELECTROLYSIS; MECHANISM; PHOTOOXIDATION; IRRADIATION; ELECTRODES;

D O I：

10.1039/c2ee02929d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The faradaic efficiency for O-2(g) evolution at thin-film WO3 photoanodes has been evaluated in a series of acidic aqueous electrolytes. In 1.0 M H2SO4, persulfate was the predominant photoelectrochemical oxidation product, and no O-2 was detected unless catalytic quantities of Ag+(aq) were added to the electrolyte. In contact with 1.0 M HClO4, dissolved O-2 was observed with nearly unity faradaic efficiency, but addition of a hole scavenger, 4-cyanopyridine N-oxide, completely suppressed O-2 formation. In 1.0MHCl, Cl-2(g) was the primary oxidation product. These results indicate that at WO3 photoanodes, water oxidation is dominated by oxidation of the acid anions in 1.0 M HCl, H2SO4, and HClO4, respectively.

引用

页码：5694 / 5700

页数：7

共 44 条

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