Efficient BiVO4 Thin Film Photoanodes Modified with Cobalt Phosphate Catalyst and W-doping

被引:324
作者
Abdi, Fatwa F. [1 ]
Firet, Nienke [1 ]
van de Krol, Roel [1 ]
机构
[1] Delft Univ Technol, Dept Chem Engn, NL-2600 GA Delft, Netherlands
关键词
Bismuth; cobalt; photochemistry; doping; PHOTOELECTROCHEMICAL WATER OXIDATION; SCANNING ELECTROCHEMICAL MICROSCOPY; ULTRASONIC SPRAY-PYROLYSIS; VISIBLE-LIGHT IRRADIATION; SOLAR HYDROGEN-PRODUCTION; OXYGEN-EVOLVING CATALYST; SURFACE RECOMBINATION; ALPHA-FE2O3; FILMS; SPACE-CHARGE; METAL-OXIDES;
D O I
10.1002/cctc.201200472
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Bismuth vanadate (BiVO4) thin film photoanodes for light-induced water oxidation are deposited by a low-cost and scalable spray pyrolysis method. The resulting films are of high quality, as indicated by an internal quantum efficiency close to 100% between 360 and 450nm. However, its performance under AM1.5 illumination is limited by slow water oxidation kinetics. This can be addressed by using cobalt phosphate (Co-Pi) as a water oxidation co-catalyst. Electrodeposition of 30nm Co-Pi catalyst on the surface of BiVO4 increases the water oxidation efficiency from approximate to 30% to more than 90% at potentials higher than 1.2V vs. a reversible hydrogen electrode (RHE). Once the surface catalysis limitation is removed, the performance of the photoanode is limited by low charge separation efficiency; more than 60% of the electron-hole pairs recombine before reaching the respective interfaces. Slow electron transport is shown to be the main cause of this low efficiency. We show that this can be remedied by introducing W as a donor type dopant in BiVO4, resulting in an AM1.5 photocurrent of approximate to 2.3mAcm2 at 1.23V vs. RHE for 1% W-doped Co-Pi-catalyzed BiVO4.
引用
收藏
页码:490 / 496
页数:7
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