Novel dual-layer photoelectrode prepared by RF magnetron sputtering for photocatalytic water splitting

Chi Hung Liao, Chao Wei Huang, Jeffrey C.S. Wu

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Visible-light absorbing TiO 2 and WO 3 photocatalytic thin films were prepared by radio-frequency (RF) magnetron sputtering. The effects of sputtering condition on the structural, optical, as well as photocatalytic properties of the prepared thin films were explored. In addition, a novel dual-layer photocatalytic thin film that combines both visible-light TiO 2 and WO 3 was prepared by the same deposition technique to further enhance the photocatalytic performance. Instrumental analyses such as XRD, SEM-EDX, and UV-visible absorption spectrometry were performed to reveal the crystallinity, surface morphology, chemical composition, and light absorption of the prepared photocatalytic thin films. The activities of the prepared photocatalytic thin films under both UV and visible-light irradiations were evaluated by conducting photovoltammetry and water-splitting reaction in an H-type reactor. The enhanced photocurrent of dual-layer photocatalytic thin film was proved to be resulted from the improved charge separation of the dual-layer structure. The H 2 and O 2 yields obtained from the water-splitting reactions were consistent with the photocurrent results, showing dual-layer photocatalyst with higher photoactivity than mono-layer photocatalyst.

Original languageEnglish
Pages (from-to)11632-11639
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number16
DOIs
Publication statusPublished - 2012 Aug

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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