Abstract
Photoelectrochemical (PEC) water oxidation represents one of the biggest scientific challenges in producing solar fuels. As a promising photoanode candidate, hematite (α-Fe2O3) suffers from limited separation of photogenerated charges. In this work, a simple spin coating method is reported to obtain α-Fe2O3/Ag films on FTO glass substrates with accurately controlled thickness and composition. The α-Fe2O3 photoanode with appropriate amount of Ag exhibited superior photoelectrochemical performance with a photocurrent density of 1.33 mA/cm2 at 1.23 V, which is 1.77 times higher than that of the pure α-Fe2O3. By calculating the bulk separation efficiency and surface separation efficiency, the significantly enhanced PEC performance is ascribed to the interfacial effect on separating the photogenerated charges in hematite. The method described herein provides a simple and general method for engineering the interface of metal/oxide interface.
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