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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This work was supported by the National Natural Science Foundation of China (Grant No. 11574081).
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Cao, Z., Yin, Y., Yang, W. et al. Amorphous Co–Pi anchored on CdSe/TiO2 nanowire arrays for efficient photoelectrochemical hydrogen production. J Mater Sci 54, 3284–3293 (2019). https://doi.org/10.1007/s10853-018-3079-5
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DOI: https://doi.org/10.1007/s10853-018-3079-5