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A library of polytypic copper-based quaternary sulfide nanocrystals enables efficient solar-to-hydrogen conversion

Liang Wu, Qian Wang, Tao-Tao Zhuang, Guo-Zhen Zhang, Yi Li, Hui-Hui Li, Feng-Jia Fan and Shu-Hong Yu (shyu@ustc.edu.cn)
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Liang Wu: University of Science and Technology of China
Qian Wang: University of Science and Technology of China
Tao-Tao Zhuang: University of Science and Technology of China
Guo-Zhen Zhang: University of Science and Technology of China
Yi Li: University of Science and Technology of China
Hui-Hui Li: University of Science and Technology of China
Feng-Jia Fan: University of Science and Technology of China
Shu-Hong Yu: University of Science and Technology of China

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Designing polytypic homojunction is an efficient way to regulate photogenerated electrons and holes, thereafter bringing desired physical and chemical properties and being attractive photocatalysts for solar-to-hydrogen conversion. However, the high-yield and controllable synthesis of well-defined polytypes especially for multinary chalcogenide - the fundamental factor favoring highly efficient solar-to-hydrogen conversion - has yet to be achieved. Here, we report a general colloidal method to construct a library of polytypic copper-based quaternary sulfide nanocrystals, including Cu2ZnSnS4, Cu2CdSnS4, Cu2CoSnS4, Cu2MnSnS4, Cu2FeSnS4, Cu3InSnS5 and Cu3GaSnS5, which can be synthesized by selective epitaxial growth of kesterite phase on wurtzite structure. Besides, this colloidal method allows the precise controlling of the homojunction number corresponding to the photocatalytic performance. The single-homojunction and double-homojunction polytypic Cu2ZnSnS4 nanocrystal photocatalysts show 2.8-fold and 3.9-fold improvement in photocatalytic hydrogen evolution rates relative to the kesterite nanocrystals, respectively. This homojunction existed in the polytypic structure opens another way to engineer photocatalysts.

Date: 2022
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DOI: 10.1038/s41467-022-33065-7

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