Water splitting property of Gd1-xBixVO4 powder photocatalysts and their thin film photoelectrodes

Hiroshi Kishida, Yuta Imagawa, Takeshi Yamaguchi, Shigeo Sato, Hironori Arakawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

New water splitting solid solution photocatalysts with the composition of Gd1-xBixVO4 (x = 0, 0.3, 0.5, 0.7, 0.8, 0.9, 0.95, 1.0) were synthesized by a solid-state reaction. Gd0.3Bi 0.7VO4 was found as novel photocatalyst with both O 2 evolution from aqueous solution of sacrificial reagent AgNO 3 under visible-light irradiation (λ > 420nm) and H 2 evolution from aqueous solution of sacrificial reagent CH 3OH under near visible-light irradiation (λ > 380nm). The obtained solid solutions such as GdVO4, Gd0.7Bi 0.3VO4, Gd0.5Bi0.5VO4, and Gd0.3Bi0.7VO4 crystallized in zircon-tetragonal crystal structures, while Gd0.05Bi 0.95VO4 and BiVO4 crystallized in scheelite-monoclinic structures. The diffuse reflectance spectra of the solid solutions shift monotonically to a long wavelength as the ratio of Bi ions to Gd ions increases in the solid solution. The structure and water splitting activity were discussed in relation to the solid solution compositions and photophysical properties. Furthermore, new thin film photoelectrodes of Gd 0.7Bi0.3VO4 and BiVO4 for solar hydrogen production were prepared by metal organic decomposition (MOD) method and polymerized complex (PC) method. The photoelectrodes were characterized by using Grazing Incidence X-ray Analysis (GIXA), SEM, cyclic voltammetry (CV) and IPCE measurement. Finally, solar energy conversion efficiency for water splitting (STH efficiency) was measured. Best STH efficiencies of BiVO 4 and Gd0.3Bi0.7VO4 thin film photoelectrodes were 0.05% at the applied potential of 0.9 V and 0.025% at the applied potential of 0.5 V vs NHE, respectively.

Original languageEnglish
Title of host publicationSolar Hydrogen and Nanotechnology III
DOIs
Publication statusPublished - 2008 Nov 21
EventSolar Hydrogen and Nanotechnology III - San Diego, CA, United States
Duration: 2008 Aug 132008 Aug 14

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7044
ISSN (Print)0277-786X

Other

OtherSolar Hydrogen and Nanotechnology III
CountryUnited States
CitySan Diego, CA
Period08/8/1308/8/14

Keywords

  • GdBiVO solid solutions
  • GdBiVO thin film photoelectrode
  • Novel water splitting photocatalysts
  • UV-light H evolution
  • Visible-light O evolution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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