title: WO3-α-Fe2O3 composite photoelectrodes with low onset potential for solar water oxidation.
abstract: The physical and photoelectrochemical properties of a composite oxide photoelectrode comprised of α-Fe2O3 and WO3 crystals is investigated. The composite films exhibit a water oxidation photocurrent onset potential as low as 0.43 V vs. RHE, a value considerably lower than that of pure α-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.
authors: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA. pztwo@princeton.edu.
authors: Peng
authors: P
authors: Zhao
authors: Coleman X
authors: CX
authors: Kronawitter
authors: Xiaofang
authors: X
authors: Yang
authors: Jie
authors: J
authors: Fu
authors: Bruce E
authors: BE
authors: Koel