Morphology control of one-dimensional heterojunctions for highly efficient photoanodes used for solar water splitting
- Authors
- Chae, Sang Youn; Jung, Hyejin; Jeon, Hyo Sang; Min, Byoung Koun; Hwang, Yun Jeong; Joo, Oh-Shim
- Issue Date
- 2014
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.29, pp.11408 - 11416
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 2
- Number
- 29
- Start Page
- 11408
- End Page
- 11416
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/101187
- DOI
- 10.1039/c4ta00702f
- ISSN
- 2050-7488
- 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.
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