光电流
异质结
分解水
贵金属
材料科学
催化作用
电化学
热液循环
基质(水族馆)
光电化学
化学工程
金属
光电子学
纳米技术
电极
光催化
化学
冶金
物理化学
海洋学
地质学
工程类
生物化学
作者
Qijun Cai,Zhifeng Liu,Changcun Han,Zhengfu Tong,Chonghao Ma
标识
DOI:10.1016/j.jallcom.2019.04.312
摘要
In order to improve the water splitting efficiency of CuInS2 in a photoelectrochemical (PEC) cell, the novel CuInS2/Sb2S3 heterostructure photocathodes modified with Pt noble metal co-catalyst were prepared on the ITO substrate by the hydrothermal and electrochemical deposition method for the first time. The mechanism of the synthesis reaction for the CuInS2/Sb2S3 and CuInS2/Sb2S3/Pt were investigated. With the photoelectrochemical measurements, the photocurrent density of CuInS2/Sb2S3/Pt photoelectrode (−2.48 mA/cm2 at −0.6 V vs. RHE) is about 3.13 times relatively higher than that of the corresponding the pure CuInS2 photoelectrode (−0.79 mA/cm2 at −0.6 V vs. RHE). The excellent PEC behaviors profit from the modification by Sb2S3 that forms the heterostructure which broadens the response of visible light and increases the separation and transfer of photo-generated carriers. Moreover, after introducing Pt co-catalyst onto the surface of CuInS2/Sb2S3 photoelectrode, photo-generated electrons can be captured quickly which further effectively promotes the separation of photo-generated carriers and greatly improve the PEC performance. This work manifests that the structure of CuInS2/Sb2S3/Pt photocathodes has a guiding suggestion to provide a promising approach to designing a highly stabilized efficient device for photoelectrochemical water splitting.
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