Understanding the Role of Gold Nanoparticles in Enhancing the Catalytic Activity of Manganese Oxides in Water Oxidation Reactions

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 th...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2015-02, Vol.54 (8), p.2345-2350
Main Authors: Kuo, Chung-Hao, Li, Weikun, Pahalagedara, Lakshitha, El-Sawy, Abdelhamid M., Kriz, David, Genz, Nina, Guild, Curtis, Ressler, Thorsten, Suib, Steven L., He, Jie
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Catalytic activity
Gold
manganese oxide
Manganese oxides
metal nanoparticles
Nanoparticles
Oxidation
oxygen evolution reaction
Photochemical
transition-metal oxides
water oxidation
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Summary: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 (
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201407783