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Proceedings Paper

Solar hydrogen production by tandem cell system composed of metal oxide semiconductor film photoelectrode and dye-sensitized solar cell
Author(s): H. Arakawa; C. Shiraishi; M. Tatemoto; H. Kishida; D. Usui; A. Suma; A. Takamisawa; T. Yamaguchi
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Paper Abstract

Photocatalytic and photoelectrochemical approaches to solar hydrogen production in our group were introduced. In photocatalytic water splitting system using NiOx/ TiO2 powder photocatalyst with concentrated Na2CO3 aqueous solution, solar energy conversion efficiency to H2 and O2 production (STH efficiency) was 0.016%. In addition, STH efficiency of visible light responding photocatalyst, NiOx/ promoted In0.9Ni0.1TaO4, was estimated at 0.03%. In photoelectrochemical system using an oxide semiconductor film phptoelectrode, STH efficiencies of meosporous TiO2 (Anatase) , mesoporous visible light responding S-doped TiO2 (Anatase) and WO3 film were 0.32-0.44% at applied potential of 0.35 V vs NHE, 0.14% at 0.55 V and 0.44% at 0.9 V, respectively. Finally, solar hydrogen production by tandem cell system composed of an oxide semiconductor photoelectrode, a Pt wire counter electrode and a dye-sensitized solar cell (DSC) was investigated. As photoelectrodes, meosporous TiO2 (Anatase), mesoporous S-doped TiO2 (Anatase), WO3, BiVO4 and Fe2O3 film were tested. STH efficiency of tandem cell system composed of a WO3 film photoelectrode, and a two-series-connected DSC (Voc = 1.4 V) was 2.5-2.8%. In conclusion, it is speculated that more than 5% STH efficiency will be obtained by tandem cell system composed of an oxide semiconductor photoelectrode and a two-series-connected DSC in near future. This suggests a cost-effective and practical application of this system for solar hydrogen production.

Paper Details

Date Published: 11 September 2007
PDF: 10 pages
Proc. SPIE 6650, Solar Hydrogen and Nanotechnology II, 665003 (11 September 2007); doi: 10.1117/12.773366
Show Author Affiliations
H. Arakawa, Tokyo Univ. of Science (Japan)
C. Shiraishi, Tokyo Univ. of Science (Japan)
M. Tatemoto, Tokyo Univ. of Science (Japan)
H. Kishida, Tokyo Univ. of Science (Japan)
D. Usui, Tokyo Univ. of Science (Japan)
A. Suma, Tokyo Univ. of Science (Japan)
A. Takamisawa, Tokyo Univ. of Science (Japan)
T. Yamaguchi, Tokyo Univ. of Science (Japan)

Published in SPIE Proceedings Vol. 6650:
Solar Hydrogen and Nanotechnology II
Jinghua Guo, Editor(s)

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