Environmentally friendly Cu2ZnSnS4-based photocathode modified with a ZnS protection layer for efficient solar water splitting
Environmentally friendly Cu2ZnSnS4-based photocathode modified with a ZnS protection layer for efficient solar water splitting
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环保型 Cu2ZnSnS4 基光电阴极，经过 ZnS 保护层修饰，可实现高效太阳能水分解
DOI：
10.1016/j.jcis.2018.10.032
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发表时间：
2019
影响因子：
9.9
通讯作者：
Jiang Feng
中科院分区：
文献类型：
--
作者：
Wang Kang;Huang Dingwang;Yu Le;Gu Huaimin;Ikeda Shigeru;Jiang Feng
采用喷雾热分解法在镀钼玻璃衬底上制备了高质量的Cu 2 ZnSnS 4（CZTS）薄膜，并将其用于太阳能水分解。CZTS下的CdS层的改性通过在CdS和CZTS之间形成pn结，有效地分离光激发载流子而不复合，从而提高了掺杂效率。然而，CdS的光腐蚀性质导致CdS/CZTS光电阴极的稳定性差。CdS覆盖的CZTS光电阴极的表面保护的ZnS层导致有效的光电化学水分解与最大的半电池太阳能氢（HC-STH）效率为2.1%，没有表现出明显的退化。ZnS层充当用于有效电子传输到Pt沉积物的介体，并且充当保护层，防止CdS层与外部电解质溶液之间的接触。
High-quality Cu2ZnSnS4(CZTS) thin films prepared by spray pyrolysis on a Mo-coated glass substrate were used for solar water splitting in this study. Modification of a CdS layer under CZTS improved the photocatalysis efficiency by forming a pn junction between CdS and CZTS, effectively separating the photoexcited carriers without recombination. However, the photocorrosive nature of CdS induces poor stability of the CdS/CZTS photocathode. Surface protection of a CdS-covered CZTS photocathode by a ZnS layer resulted in efficient photoelectrochemical water splitting with a maximum half-cell solar to hydrogen (HC-STH) efficiency of 2.1% and without showing appreciable degradation. The ZnS layer acts as a mediator for efficient electron transport to Pt deposits and as a protective layer, preventing contact between the CdS layer and the outer electrolyte solution.