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

Sang Youn Chae, Hyejin Jung, Hyo Sang Jeon, Byoung Koun Min, Yun Jeong Hwang, Oh Shim Joo

Research output: Contribution to journalArticle

33 Citations (Scopus)

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) WO 3 nanorods, directly grown on F-doped tin oxide, are advantageous for transporting electrons to the back contact. The morphology of the BiVO 4 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.

Original languageEnglish
Pages (from-to)11408-11416
Number of pages9
JournalJournal of Materials Chemistry A
Volume2
Issue number29
DOIs
Publication statusPublished - 2014 Aug 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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