文献类型：期刊文献

英文题名：ZnIn₂S₄ nanosheets with tunable dual vacancies for efficient sacrificial-agent-free H₂O₂ photosynthesis

作者：Zhang, Chen[1,4];Xu, Gao[1];Liang, Qifeng[1];Liang, Li[1];Fang, Zebo[1];Wu, Rong[4];Wei, Shunhang[1];Wang, Lei[3];Xu, Xiaoxiang[2]

机构：[1]Shaoxing Univ, Zhejiang Engn Res Ctr MEMS, Shaoxing 312000, Peoples R China;[2]Tongji Univ, Sch Chem Sci & Engn, Shanghai 200092, Peoples R China;[3]Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China;[4]Xinjiang Univ, Sch Phys Sci & Technol, Urumqi 830000, Peoples R China

年份：2024

外文期刊名：INORGANIC CHEMISTRY FRONTIERS

收录：SCI-EXPANDED(收录号：WOS:001339363100001)、、WOS

基金：This work was supported by the National Natural Science Foundation of China (grant no. 52302291, 22066024, and 52172225), the Natural Science Foundation of Zhejiang Province (LQ24F050011), the China Postdoctoral Science Foundation (grant no. 2023M740793), and the Postdoctoral Fellowship Program of CPSF (grant no. GZB20230176).

语种：英文

外文摘要：ZnIn2S4 nanosheets with tunable concentration of dual vacancies (i.e. Zn vacancy and S vacancy) were prepared and used for photocatalytic H2O2 production. Introducing dual vacancies effectively promotes exciton dissociation, facilitates O2 adsorption, and reduces the free energy of subsequent activation and protonation of adsorbed O2. These intriguing properties endow ZnIn2S4 with excellent performance for sacrificial agent-free H2O2 photosynthesis via a two-step single-electron oxygen reduction reaction pathway under AM 1.5 and visible-light irradiation. Almost double amounts of H2O2 can be produced over ZnIn2S4 with dual vacancies compared to pristine ZnIn2S4 without vacancies. Corresponding SCC efficiency and AQY at 420 +/- 20 nm reached similar to 0.031% and 0.34%, respectively. In addition, the abundant dual vacancies inhibit H2O2 decomposition because of enhanced hydrophilicity. This work provides a new strategy to improve the photocatalytic performance of ZnIn2S4 through defect engineering and brings new mechanistic insights into the role of these defects.