Abstract
In photoelectrochemical (PEC) water splitting systems, an overlayer on the surface of the semiconductor has always been pursued with tremendous interest. The multicomponent Fe2O3/FexSn1−xO4/FeOOH photoanode is designed to achieve efficient water splitting. The photocurrent density of Fe2O3/FexSn1−xO4/FeOOH photoanode is 1.70 mA cm−2 at 1.23 V vs reversible hydrogen electrode (RHE), improved by 121.1%, compared with that of the pristine hematite photoanode (0.77 mA cm−2 at 1.23 V vs RHE) under air mass (AM) 1.5 illumination (100 mW cm−2). Detailed characterization is carried out to explore the main factors of photocurrent enhancement. The excellent PEC performance could be attributed to the synergetic benefits of FexSn1−xO4 passivation layer and FeOOH catalyst, which reduce the rate of electron–hole recombination and improve water oxidation reaction kinetics. The results prove a new sight to achieve efficient PEC water splitting.
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