Photo-assisted electrodeposition of cobalt-phosphate (Co-Pi) catalyst on hematite photoanodes for solar water oxidation

被引：589

作者：

Zhong, Diane K. ^{[1
]}

Cornuz, Maurin ^{[2
]}

Sivula, Kevin ^{[2
]}

Graetzel, Michael ^{[2
]}

Gamelin, Daniel R. ^{[1
]}

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

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

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2011年 / 4卷 / 05期

关键词：

OXYGEN-EVOLVING CATALYST; NANOSTRUCTURED HEMATITE; HYDROGEN GENERATION; VISIBLE-LIGHT; FEATURE SIZE; OXIDE; PHOTOOXIDATION; PHOTOELECTROCHEMISTRY; PHOTOELECTROLYSIS; FILMS;

D O I：

10.1039/c1ee01034d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A photo-assisted electrodeposition approach was used to deposit a cobalt-phosphate water oxidation catalyst ("Co-Pi") onto recently improved dendritic mesostructures of alpha-Fe2O3. A comparison between this approach, electrodeposition of Co-Pi, and Co2+ wet impregnation showed that photo-assisted electrodeposition of Co-Pi yields superior alpha-Fe2O3 photoanodes for photoelectrochemical water oxidation. Stable photocurrent densities of 1.0 mA cm(-2) at 1.0 V and 2.8 mA cm(-2) at 1.23 V vs. RHE measured under standard illumination and basic conditions were achieved. By allowing deposition only where visible light generates oxidizing equivalents, photo-assisted electrodeposition provides a more uniform distribution of Co-Pi onto alpha-Fe2O3 than obtained by electrodeposition. This approach of fabricating catalyst-modified metal-oxide photoelectrodes may be attractive for optimization in conjunction with tandem or hybrid photoelectrochemical cells.

引用

页码：1759 / 1764

页数：6

共 39 条

[21] Heterogeneous photocatalyst materials for water splitting [J].