Zhao Yumeng, Chen Yajie, Du Lizhi, Wang Qi, Liu Xiu, Li Longge, Tian Guohui
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, PR China.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, PR China.
J Colloid Interface Sci. 2022 Jan;605:253-262. doi: 10.1016/j.jcis.2021.07.093. Epub 2021 Jul 23.
Designing and constructing advanced heterojunction architectures are desirable for boosting CO photoreduction performance of semiconductor photocatalysts. Herein, we have prepared hierarchical ZnS@ZnInS core-shell cages with controlled particle sizes using sequential synthesis of Zeolitic imidazolate (ZIF-8) polyhedrons, ZnS cages, and ZnInS 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@ZnInS core-shell cages by growing ZnInS nanosheets. The size of ZnS cages can be tuned to optimize CO photoreduction performance of hierarchical ZnS@ZnInS 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@ZnInS core-shell cages exhibit enhanced performance for CO photoreduction with the CO yield of 87.43 μmol hg and 84.3% selectivity, which are much superior to those of single ZnInS or ZnS. Upon Au decoration, the CO photoreduction performance of ZnS@ZnInS core-shell cages is further enhanced because of the Schottky junctions and surface plasmon resonance effect.
设计和构建先进的异质结结构对于提高半导体光催化剂的CO光还原性能是很有必要的。在此，我们通过在ZnS多面体笼上依次合成沸石咪唑酯（ZIF-8）多面体、ZnS笼和ZnInS纳米片，制备了粒径可控的分级ZnS@ZnInS核壳笼。ZIF-8多面体首先通过液相法合成。ZIF-8多面体随后的硫化反应导致形成ZnS多面体笼，其作为通过生长ZnInS纳米片来制造ZnS@ZnInS核壳笼的基底。可以调节ZnS笼的尺寸以优化分级ZnS@ZnInS核壳笼的CO光还原性能。独特的分级核壳笼状结构和异质结组成的协同作用赋予了混合催化剂高的入射光利用率、丰富的活性位点以及光激发电荷载流子的有效分离。受益于这些优点，优化后的分级ZnS@ZnInS核壳笼表现出增强的CO光还原性能，CO产率为87.43 μmol hg，选择性为84.3%，远优于单一的ZnInS或ZnS。在Au修饰后，由于肖特基结和表面等离子体共振效应，ZnS@ZnInS核壳笼的CO光还原性能进一步增强。
