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

被引：120

作者：

Kuo, Chung-Hao ^{[1
]}

Li, Weikun ^{[1
]}

Pahalagedara, Lakshitha ^{[1
]}

El-Sawy, Abdelhamid M. ^{[1
]}

Kriz, David ^{[1
]}

Genz, Nina ^{[3
]}

Guild, Curtis ^{[1
]}

Ressler, Thorsten ^{[3
]}

Suib, Steven L. ^{[1
,2
]}

He, Jie ^{[1
,2
]}

机构：

[1] Univ Connecticut, Dept Chem, Storrs, CT 06269 USA

[2] Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA

[3] Tech Univ Berlin, Dept Chem, D-10623 Berlin, Germany

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 08期

关键词：

manganese oxide; metal nanoparticles; oxygen evolution reaction; transition-metal oxides; water oxidation; OXYGEN-EVOLVING CATALYSTS; COBALT OXIDE; ELECTROCHEMICAL EVOLUTION; ELECTRON-TRANSFER; MNOX FILMS; EFFICIENT; ELECTROCATALYSTS; NANOCRYSTALS; OL-1; PH;

D O I：

10.1002/anie.201407783

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：2345 / 2350

页数：6

共 42 条

[1]

[Anonymous], 2007, ANGEW CHEM, DOI DOI 10.1002/ANIE.200605048

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