Abstract
Photoelectrochemical (PEC) water splitting, as a promising route of STH(solar to hydrogen) conversion, has attracted a lot attention recently. However, the rather high recombination and the low transfer rate of photoinduced electron-hole pairs restrict the applications. In this work, n-ZnO/p-CuS photoanodes were fabricated using hydrothermal method and successive ionic layer adsorption and reaction (SILAR) method. The PEC performance of the ZnO photoanode is significantly improved after depositing CuS. The applied bias photon-to-current efficiency (ABPE) of ZnO/CuS 10 (the cycles of SILAR) photoanode attained 0.368% at a bias of 0.984 V vs SCE which is 45 times than ZnO. The relatively high value of photocurrent density and ABPE are due to the advantages of the ordered structure of ZnO nanorods arrays and the common effect comes from the formation of heterojunction and faster transfer rate of photogenerated electrons which further facilitate charge carrier separation and the light absorption. This work represents a facile strategy using low cost CuS for PEC water splitting that can be applied in photocatalysis.
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