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WO3/BiVO4composite photoelectrode prepared by improved auto-combustion method for highly efficient water splitting

Authors
Journal
International Journal of Hydrogen Energy
0360-3199
Publisher
Elsevier
Volume
39
Issue
6
Identifiers
DOI: 10.1016/j.ijhydene.2013.08.114
Keywords
  • Visible-Light Responsive Metal Oxide
  • Hydrogen
  • Applied Bias Photon-To-Current Efficiency
  • Tungsten Trioxide
  • Bismuth Vanadate
Disciplines
  • Physics

Abstract

Abstract We report on the improvement in the water splitting efficiency of a WO3/BiVO4 composite photoelectrode by the application of an improved auto-combustion method to the preparation of porous BiVO4 thin films. The unique feature of this preparation method is the addition of both NH4NO3, as a strong oxidizing agent, and an organic additive into BiVO4 precursor solution. The local decomposition heat of the organic additive and oxidizing agent created a porous film with small, highly crystalline BiVO4 particles. The photoelectrode has many advantages over existing ones, such as the high light-harvesting efficiency (LHE), a single BiVO4 phase, the facile access of the holes to the photoelectrode/electrolyte interface, and the ease of water and oxygen diffusion. The maximum incident photon-to-current efficiency (IPCE) was estimated to be 64% (at 440 nm, 1.23 V vs. RHE) and the applied bias photon-tocurrent efficiency (ABPE) reached as high as 1.28%. This ABPE value is highest among all oxide semiconductor photoelectrodes reported previously, except for the case of a stacking photoelectrode system.

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