期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 8, 页码 2345-2350出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201407783
关键词
manganese oxide; metal nanoparticles; oxygen evolution reaction; transition-metal oxides; water oxidation
资金
- University of Connecticut
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical, Biological and Geological Sciences [DE-FG02-86ER13622A000]
- Green Emulsions Micelles and Surfactants (GEMS) Center
The Earth-abundant and inexpensive manganese oxides (MnOx) have emerged as an intriguing type of catalysts for the water oxidation reaction. However, the overall turnover frequencies of MnOx catalysts are still much lower than that of nanostructured IrO2 and RuO2 catalysts. Herein, we demonstrate that doping MnOx polymorphs with gold nanoparticles (AuNPs) can result in a strong enhancement of catalytic activity for the water oxidation reaction. It is observed that, for the first time, the catalytic activity of MnOx/AuNPs catalysts correlates strongly with the initial valence of the Mn centers. By promoting the formation of Mn3+ species, a small amount of AuNPs (<5%) in -MnO2/AuNP catalysts significantly improved the catalytic activity up to 8.2 times in the photochemical and 6 times in the electrochemical system, compared with the activity of pure -MnO2.
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