The Role of Cobalt Phosphate in Enhancing the Photocatalytic Activity of α-Fe2O3 toward Water Oxidation

被引：540

作者：

Barroso, Monica ^{[1
]}

Cowan, Alexander J. ^{[1
]}

Pendlebury, Stephanie R. ^{[1
]}

Graetzel, Michael ^{[2
]}

Klug, David R. ^{[1
]}

Durrant, James R. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

[2] Ecole Polytech Fed Lausanne, Inst Sci & Ingn Chim, CH-1015 Lausanne, Switzerland

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 38期

基金：

英国工程与自然科学研究理事会;

关键词：

OXYGEN-EVOLVING CATALYST; NANOSTRUCTURED ALPHA-FE2O3; NEUTRAL PH; EVOLUTION; OXIDE; PHOTOANODES; FILMS; PHOTOOXIDATION; SPECTROSCOPY; PROGRESS;

D O I：

10.1021/ja205325v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Transient absorption spectroscopy was used to probe the dynamics of photogenerated charge carriers in alpha-Fe2O3/CoOx nanocomposite photoelectrodes for water splitting. The addition of cobalt-based electrocatalysts was observed to increase the lifetime of photogenerated holes in the photoelectrode by more than 3 orders of magnitude without the application of electrical bias. We therefore propose that the enhanced photoelectrochemical activity of the composite electrode for water photooxidation results, at least in part, from reduced recombination losses because of the formation of a Schottky-type heterojunction.

引用

页码：14868 / 14871

页数：4

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