Abstract
Photoelectrochemical (PEC) water splitting into hydrogen and oxygen using hybridized semiconductor photoelectrodes has become a promising strategy for converting solar energy into clean and sustainable H2 fuel. Here, we report a promising hybrid photoanode constructed by electrodepositing an amorphous Co–Pi film onto semiconducting CdSe/TiO2 nanowire arrays for photoelectrochemical hydrogen production. This photoanode exhibits a high water-splitting photocurrent density, which is attributed to the broad visible light absorption and efficient charge carrier separation by the virtue of the type-II heterojunction formed between TiO2 and CdSe. Photoconversion efficiency of Co–Pi/CdSe/TiO2 and CdSe/TiO2 photoanodes increase by 3.3 and 2.1 times, compared with the pristine TiO2 photoanode. Moreover, Co–Pi/CdSe/TiO2 photoelectrode shows greatly improved PEC stability, the drop in photocurrent of Co–Pi/CdSe/TiO2 nanowire arrays photoelectrode is about 10% after 1 h illumination, because of the addition of the Co–Pi film protecting the light absorber CdSe/TiO2 from photocorrosion. The enhanced PEC performance mechanism of triple hybrid photoanode is also discussed in this paper.
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