Photo-sensitization of BiOCl by CuInS2 Surface Layer for Photoelectrochemical Cathode
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To develop and enrich the types of photocathodes, BiOCl as holes transport layer was introduced into photoelectrochemical (PEC) water splitting. The NiS/CuInS2/BiOCl photocathode was structurally, optically, and photoelectrochemically characterized. BiOCl provides a fast channel for holes transport because of its suitable valence band and conduction band position. In terms of broadening the light absorption range and improving photocurrent performance, CuInS2, NiS and BiOCl complement each other. When exposed to Xe lamps, the current density generated by integrated photocathode is approximately − 150 μA cm−2, which is under the conditions of simulated sunlight (AM1.5G), 0.5 M Na2SO4 solution and 0 V vs NHE. It also shows good stability in 20000 s. All the results reveal that BiOCl is a promising holes transfer material for the manufacture of PEC devices in the solar splitting of water.
KeywordsBiOCl Hole transport layer Photocathode
The authors gratefully acknowledge the support from the National Natural Science Foundation of China (Grant Nos. 21676123, 21575052), the Natural Science Foundation of Jiangsu Province (Grant No. BK20161127), the Fundamental Research Funds for the Central Universities (Grant No. JUSRP51623A), Opening Foundation of Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals (Grant No. ZDSYS-KF201504) from Shandong Normal University, the National First-class Discipline Program of Food Science and Technology (Grant No. JUFSTR20180301) and MOE & SAFEA for the 111 Project (B13025).
The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.
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Conflict of interest
The authors declare that they have no conflict of interest.
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