CuInS2/Sb2S3 heterostructure modified with noble metal co-catalyst for efficient photoelectrochemical water splitting
CuInS2/Sb2S3 heterostructure modified with noble metal co-catalyst for efficient photoelectrochemical water splitting
复制标题
贵金属助催化剂修饰的 CuInS2/Sb2S3 异质结构用于高效光电化学水分解
DOI：
10.1016/j.jallcom.2019.04.312
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发表时间：
2019-07-30
影响因子：
6.2
通讯作者：
Ma, Chonghao
中科院分区：
文献类型：
--
作者：
Cai, Qijun;Liu, Zhifeng;Ma, Chonghao
为了提高光电化学（PEC）电池中CuInS2的水分解效率，首次采用水热电化学沉积方法在ITO基底上制备了Pt贵金属助催化剂修饰的新型CuInS2/Sb2S3异质结构光阴极。研究了CuInS2/Sb2S3和CuInS2/Sb2S3/Pt的合成反应机理。通过光电化学测量，CuInS2/Sb2S3/Pt光电极的光电流密度（-2.48 mA/cm(2) at -0.6 V vs. RHE）比相应的纯CuInS2光电极（-0.79 mA/cm(2) at -0.6 V vs. RHE）高约3.13倍。优异的PEC行为得益于Sb2S3的修饰，形成异质结构，拓宽了可见光的响应并增加了光生载流子的分离和转移。此外，在CuInS2/Sb2S3光电极表面引入Pt助催化剂后，可以快速捕获光生电子，进一步有效促进光生载流子的分离，大大提高PEC性能。这项工作表明，CuInS2/Sb2S3/Pt 光电阴极的结构具有指导意义，为设计高度稳定的高效光电化学水分解装置提供了一种有前景的方法。 (C) 2019 Elsevier B.V. 保留所有权利。
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/cm(2) 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/cm(2) 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. (C) 2019 Elsevier B.V. All rights reserved.