Morphology control of one-dimensional heterojunctions for highly efficient photoanodes used for solar water splitting

Title
Morphology control of one-dimensional heterojunctions for highly efficient photoanodes used for solar water splitting
Authors
채상윤정혜진전효상민병권황윤정주오심
Issue Date
2014-08
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 2, NO 29, 11408-11416
Abstract
In a dual bandgap system such as WO3/BiVO4, the morphology of each component should be controlled by understanding its properties, in particular with respect to the charge flow in the system. For WO3/BiVO4 photoanodes, a porous BiVO4 film allows contact of an electrolyte to the bottom layer with enhanced surface area, thereby promoting the oxidation reaction, while one-dimensional (1-D) WO3 nanorods, directly grown on F-doped tin oxide, are advantageous for transporting electrons to the back contact. The morphology of the BiVO4 film covered by 1-D WO3 nanorods varies with the addition of organic additives such as ethylcellulose in the metal precursor solution. The cross-sectional images from scanning electron microscopy show that 1-D WO3 nanorods is coated with the BiVO4 layer, which forms a porous top layer that can effectively absorb visible light and enhance charge transfer resulting in enhanced photocurrents. We report on the highest photocurrent at a potential of 1.23 V versus a reversible hydrogen electrode (RHE) by means of a 1-D WO3/BiVO4/Co-Pi photoanode. The strategies for constructing such kind of heterojunctions are well applicable to other dual bandgap photoanodes.
URI
http://pubs.kist.re.kr/handle/201004/50443
ISSN
20507488
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KIST Publication > Article
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