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Composition-dependent micro-structure and photocatalytic performance of g-C_(3)N_(4) quantum dots@SnS2 heterojunction

查看全文 作　　者：Sheng-Qi [1]Guo;Haijun [2]Zhang;Zhenzhong [1]Hu;Mengmeng [1]Zhen;Bo [4]Yang;Boxiong [1]Shen;Fan [3]Dong 高影响力作者 机构地区：[1]Tianjin Key Laboratory of Clean Energy and Pollutant Control,School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin,300401,China;[2]Center for Aircraft Fire and Emergency,Department of Safety Engineering,Civil Aviation University of China,Tianjin,300300,China;[3]Yangtze Delta Region Institute(Huzhou),&Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Huzhou,313001,China;[4]Institute of Advanced Technology,University of Science and Technology of China,Hefei,230088,China高影响力机构 出　　处：《Nano Research》索引2021年第14卷第11期,共9页高影响力期刊 基　　金：This work was supported by National Key Research and Development Program of China(No.2018YFB0605101);the National Natural Science Foundation of China(Nos.21701125 and 21403001);Natural Science Foundation of Tianjin(No.20JCQNJC00950);China Postdoctoral Science Foundation(Nos.2020M680869 and 2019TQ0299);Key R&D projects in Hebei Province(No.20373701D);Natural Science Foundation of Hebei Province(B2019202455);Overseas High-level Talents Introduction Plan Foundation of Hebei Province(No.E2019050012). 摘　　要：Semiconductor combination is one of the most common strategies to obtain high-efficiency photocatalysts;however, the effect mechanism of composition ratio on micro-structure and photocatalytic activity is remaining unclear. In this study, a case of g-C_(3)N_(4) quantum dots@SnS_(2) (CNQDn@SnS_(2)) heterojunction with different ratio of CNQD is used to uncover the origin of optimum and excess composition for photocatalysts. Research on the functional mechanism of the optimum composition shows that 0.8 wt.% CNQD are completely attached to the non-(001) facets of SnS_(2), which benefits the formation of type-II heterojunction, resulting in an optimal pollutant degradation and mineralization efficiency. For the excess composition, both experiments and theoretical calculations confirm that excess CNQD (the part exceeding of 0.8 wt.%) located on the (001) facet of SnS_(2), leading to the type-I band alignment of this heterojunction, which severely restricts the separation of photo-induced charge carriers, and thus reduces their lifetime. This work makes the functional mechanism of composition ratio on micro-structure and photocatalytic activity clearer. Related research results provide a new insight into semiconductor combination study and take an important step toward the rational design of highly active photocatalysts. 关 键 词：HETEROJUNCTION semiconductor combination composition ratio PHOTOCATALYST functional mechanism
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