Abstract
A FeCoW oxy–hydroxide gel coated Fe2O3 film photoanode has been examined for photoelectrochemical (PEC) water oxidation reaction. The FeCoW coating acts as a hole storage layer, resulting in efficient hole extraction from Fe2O3 for water oxidation. In addition, the surface state of FeCoW/Fe2O3 shifts to higher position, thus allows for a lower turn–on voltage (Von) of the photocurrent. The composite anode exhibits an 84% increase of the photocurrent, at 1.23V versus reversible hydrogen electrode (RHE), over the bare Fe2O3 photoanode. The Von is as low as 0.67V vs. RHE. The applied bias photon–to–current efficiency of the composite is 2.7 times higher than that of the bare Fe2O3. Moreover, an extremely low bias photoresponse of 0.45V vs. RHE and a good stability are observed with the FeCoW/Fe2O3 photoanode. Besides, with changing of the thickness of the FeCoW coating slurry, the PEC performance of the FeCoW/Fe2O3 photoanode can be tuned.
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