Near-Complete Suppression of Surface Recombination in Solar Photoelectrolysis by "Co-Pi" Catalyst-Modified W:BiVO4

被引:930
作者
Zhong, Diane K. [1 ]
Choi, Sujung [1 ]
Gamelin, Daniel R. [1 ]
机构
[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA
关键词
PHOTOELECTROCHEMICAL WATER OXIDATION; SCANNING ELECTROCHEMICAL MICROSCOPY; OXYGEN-EVOLVING CATALYST; VISIBLE-LIGHT; BIVO4; OXIDE; PHOTOANODES; EVOLUTION; HYDROGEN; PHOTOCATALYSTS;
D O I
10.1021/ja207348x
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The influence of an earth-abundant water oxidation electrocatalyst (Co-Pi) on solar water oxidation by W:BiVO4 has been studied using photoelectrochemical (PEC) techniques. Modification of W:BiVO4 photoanode surfaces with Co-Pi has yielded a very large (similar to 440 mV) cathodic shift in the onset potential for sustained PEC water oxidation at pH 8. PEC experiments with H2O2 as a surrogate substrate have revealed that interfacing Co-Pi with these W:BiVO4 photoanodes almost completely eliminates losses due to surface electron-hole recombination. The results obtained for W:BiVO4 are compared with those reported recently for Co-Pi/alpha-Fe2O3 photoanodes. The low absolute onset potential of similar to 310 mV vs RHE achieved with the Co-Pi/W:BiVO4 combination is promising for overall solar water splitting in low-cost tandem PEC cells, and is encouraging for application of this surface modification strategy to other candidate photoanodes.
引用
收藏
页码:18370 / 18377
页数:8
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