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Template synthesis of porous hierarchical Cu2ZnSnS4 nanostructures for photoelectrochemical water splitting
International Journal of Hydrogen Energy ( IF 7.2 ) Pub Date : 2020-05-20 , DOI: 10.1016/j.ijhydene.2020.04.243
Yubin Chen , Hongyu Xia , Wenshuai Zhang , Wenyu Zheng , Xiaoyang Feng , Jiangang Jiang

Environmentally friendly and low-cost Cu2ZnSnS4 (CZTS) is a promising light absorber for photoelectrochemical (PEC) hydrogen production from water splitting due to the earth-abundant elements, high absorption coefficient, and narrow bandgap. Herein, the hierarchical CZTS film with porous nanostructures was successfully synthesized by a template method. The hierarchical CZTS film was composed of flower-like particles, which were assembled with thin CZTS nanosheets. Macropores were generated owing to the aggregation of flower-like spheres, and mesopores were formed from the stacking of CZTS nanosheets. Compared to the dense CZTS film, the porous hierarchical CZTS film showed a much higher PEC property for water splitting. The improved performance could be attributed to three merits of the porous hierarchical morphology: enhanced light absorption, improved charge separation and transfer, and enlarged electrochemically active surface area. This study provides a useful idea to design efficient semiconductor photoelectrodes for water splitting with delicately controlled morphology.



中文翻译:

光电化学水分解多孔Cu 2 ZnSnS 4纳米多孔纳米结构的模板合成

环保且低成本的Cu 2 ZnSnS 4CZTS(CZTS)是一种有前途的光吸收剂,用于吸收水分解产生的光化学(PEC)氢,这是由于地球上的元素丰富,吸收系数高和带隙窄。在此,通过模板法成功地合成了具有多孔纳米结构的分层CZTS膜。分层的CZTS膜由花状颗粒组成,并与薄的CZTS纳米片组装在一起。大孔是由于花状球的聚集而产生的,而中孔是由CZTS纳米片的堆叠形成的。与致密的​​CZTS膜相比,多孔的分层CZTS膜表现出更高的水分解PEC性能。性能的提高可归因于多孔层次形态的三个优点:增强的光吸收,改进的电荷分离和转移,和扩大的电化学活性表面积。这项研究为设计有效的半导体光电电极提供了有用的想法,该电极可用于水的分解并具有精细控制的形态。

更新日期:2020-05-20
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