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Proceedings Paper

Photoelectrochemical and structural characterization of carbon-doped In2O3 and carbon-doped WO3 films prepared via spray pyrolysis
Author(s): Yanping Sun; Rina Rajpura; Daniel Raftery
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Paper Abstract

Carbon-doped In2O3 and carbon-doped WO3 films were produced using a spray pyrolysis methodology with octanoic acid as the carbon dopant source. C-doped and undoped In2O3 films showed a cubic polycrystalline In2O3 structure, and C-doped and undoped WO3 films displayed a monoclinic polycrystalline WO3 structure. C-doped In2O3 and WO3, compared to their corresponding undoped materials, showed increased absorption in the 350-550 nm range with a red shift in the band gap transition. The presence of carbonate-type species in these C-doped samples was confirmed by XPS. The photoelectrochemical activity was evaluated under near UV-visible light and visible light only irradiation conditions. Under the same irradiation conditions, C-doped In2O3 and C-doped WO3 electrodes produced greater photocurrent densities than their corresponding undoped electrodes. The C-doped In2O3 electrode exhibited photocurrent densities up to 1 mA/cm2, with 40% from visible light irradiation, and the C-doped WO3 electrode showed photocurrent densities up to 1.3 mA/cm2, with 50% from visible light irradiation. These results indicate the potential for further development of In2O3 and WO3 photocatalysts by simple wet chemical methods, and provide useful information towards understanding the structure and enhanced photoelectrochemical properties of these materials.

Paper Details

Date Published: 20 August 2009
PDF: 8 pages
Proc. SPIE 7408, Solar Hydrogen and Nanotechnology IV, 74080D (20 August 2009); doi: 10.1117/12.825376
Show Author Affiliations
Yanping Sun, Purdue Univ. (United States)
Rina Rajpura, Purdue Univ. (United States)
Daniel Raftery, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 7408:
Solar Hydrogen and Nanotechnology IV
Frank E. Osterloh, Editor(s)

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