首页|Atomic Ni directional-substitution on ZnIn2S4 nanosheet to achieve the equilibrium of elevated redox capacity and efficient carrier-kinetics performance in photocatalysis
Atomic Ni directional-substitution on ZnIn2S4 nanosheet to achieve the equilibrium of elevated redox capacity and efficient carrier-kinetics performance in photocatalysis
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It is a challenge to coordinate carrier-kinetics performance and the redox capacity of photogenerated charges synchronously at the atomic level for boosting photocatalytic activity.Herein,the atomic Ni was introduced into the lattice of hexagonal ZnIn2S4 nanosheets(Ni/ZnIn2S4)via directional-substituting Zn atom with the facile hydrothermal method.The electronic structure calculations indicate that the introduction of Ni atom effectively extracts more electrons and acts as active site for subsequent reduction reaction.Besides the optimized light absorption range,the elevation of Ef and ECB endows Ni/ZnIn2S4 photocatalyst with the increased electron concentration and the enhanced reduction ability for surface reaction.Moreover,ultrafast transient absorption spectroscopy,as well as a series of electro-chemical tests,demonstrates that Ni/ZnIn2S4 possesses 2.15 times longer lifetime of the excited charge carriers and an order of magnitude increase for carrier mobility and separation efficiency compared with pristine ZnIn2S4.These efficient kinetics performances of charge carriers and enhanced redox capacity synergistically boost photocatalytic activity,in which a 3-times higher conversion efficiency of nitroben-zene reduction was achieved upon Ni/ZnIn2S4.Our study not only provides in-depth insights into the effect of atomic directional-substitution on the kinetic behavior of photogenerated charges,but also opens an avenue to the synchronous optimization of redox capacity and carrier-kinetics performance for efficient solar energy conversion.
Haibin Huang、Guiyang Yu、Xingze Zhao、Boce Cui、Jinshi Yu、Chenyang Zhao、Heyuan Liu、Xiyou Li
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School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China
Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science(MOE),College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,Shandong,China
College of New Energy,China University of Petroleum(East China),Qingdao 266580,Shandong,China
National Natural Science Foundation of ChinaNatural Science Foundation of Shandong ProvinceKey Program of National Natural Science Foundation of ChinaYankuang Group 2019 Science and Technology Program
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