期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 4, 页码 1327-1332出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp53324g
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资金
- Andlinger Center for Energy and the Environment (ACEE)
- Princeton University
The physical and photoelectrochemical properties of a composite oxide photoelectrode comprised of alpha-Fe2O3 and WO3 crystals is investigated. The composite films exhibit a water oxidation photo-current onset potential as low as 0.43 V vs. RHE, a value considerably lower than that of pure alpha-Fe2O3 photoanodes prepared in comparable synthesis conditions. This result represents one of the lowest onset potentials measured for hematite-based PEC water oxidation systems. Compositional analysis by X-ray Photoelectron Spectroscopy and Energy Dispersive Spectroscopy indicates the composition of the films differs between the surfaces and bulk, with tungsten found to be concentrated in the surface region. Post-reaction Raman spectroscopy characterization demonstrates that water interacts with surface WO3 crystals, an event that is associated with the formation of a hydrated form of the oxide.
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