期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 605, 期 -, 页码 253-262出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.07.093
关键词
ZnS; ZnIn2S4; Heterostructured cages; Photocatalysis; CO2 photoreduction
资金
- National Natural Science Foundation of China [51772079, 22072037]
- Natural Science Foundation of Heilongjiang Province of China [LH2020B018]
The hierarchical ZnS@ZnIn2S4 core-shell cages were prepared by sequentially synthesizing ZIF-8 polyhedrons, ZnS cages, and ZnIn2S4 nanosheets. The unique structure and heterojunction composition of the hybrid catalyst provide high incident light utilization, abundant active sites, and effective separation of photoexcited charge carriers. The optimized hierarchical ZnS@ZnIn2S4 core-shell cages exhibit enhanced CO2 photoreduction performance, outperforming single ZnIn2S4 or ZnS catalysts.
Designing and constructing advanced heterojunction architectures are desirable for boosting CO2 photoreduction performance of semiconductor photocatalysts. Herein, we have prepared hierarchical ZnS@ZnIn2S4 core-shell cages with controlled particle sizes using sequential synthesis of Zeolitic imidazolate (ZIF-8) polyhedrons, ZnS cages, and ZnIn2S4 nanosheets on the ZnS polyhedron cages. ZIF-8 polyhedrons are firstly synthesized by a liquid-phase approach. The subsequent sulfidation of the ZIF-8 polyhedrons results in the formation of ZnS polyhedron cages, which act as substrates for fabricating ZnS@ZnIn2S4 core-shell cages by growing ZnIn2S4 nanosheets. The size of ZnS cages can be tuned to optimize CO2 photoreduction performance of hierarchical ZnS@ZnIn2S4 core-shell cages. The synergy of the unique hierarchical core-shell cage-like structure and heterojunction composition endows the hybrid catalyst high incident light utilization, abundant active sites, and effective separation of photoexcited charge carriers. Benefiting from these advantages, the optimized hierarchical ZnS@ZnIn2S4 core-shell cages exhibit enhanced performance for CO2 photoreduction with the CO yield of 87.43 mu mol h(-1) g(-1) and 84.3% selectivity, which are much superior to those of single ZnIn2S4 or ZnS. Upon Au decoration, the CO2 photoreduction performance of ZnS@ZnIn2S4 core-shell cages is further enhanced because of the Schottky junctions and surface plasmon resonance effect. (C) 2021 Elsevier Inc. All rights reserved.
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