Strong support effect induced by MXene for the synthesis of metal sulfides nanosheet arrays with sulfur vacancies towards selective CO_(2)-to-CO photoreduction  

MXene诱导的强载体效应介导合成具有硫空位的金属硫化物纳米片阵列以实现选择性光催化CO_(2)还原为CO

作　　者：Guanshun Xie Le Liao Jie Wang Peng Zhang Benhua Xu Xiuqiang Xie Chi Chen Babak Anasori Nan Zhang 谢关顺;廖乐;王洁;张鹏;徐本花;解修强;陈驰;Babak Anasori;张楠

机构地区：[1]College of Materials Science and Engineering,Hunan University,Changsha 410082,China [2]Qinghai Provincial Key Laboratory of New Light Alloys,Qinghai University,Xining 810016,China [3]Chemical Engineering College,Qinghai University,Xining 810016,China [4]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [5]School of Materials Engineering,School of Mechanical Engineering,Purdue University,West Lafayette 47907,USA

出　　处：《Science Bulletin》2024年第20期3247-3259,共13页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(52272295,52071137,51977071,51802040,and 21802020);the Science and Technology Innovation Program of Hunan Province(2021RC3066 and 2021RC3067);Natural Science Foundation of Hunan Province(2020JJ3004 and 2020JJ4192);financial support of the Fundamental Research Funds for the Central Universities。

摘　　要：Selective CO_(2)-to-CO photoreduction is under intensive research and requires photocatalysts with tuned microstructures to accelerate the reaction kinetics.Here,we report CuInS_(2)nanosheet arrays with sulfur vacancies(VS)grown on the two-dimensional(2D)support of Ti_(3)C_(2)T_(x)MXene for CO_(2)-to-CO photoreduction.Our results reveal that the use of Ti_(3)C_(2)T_(x)induces strong support effect,which causes the hierarchical nanosheet arrays growth of CuInS_(2)and simultaneously leads to charge transfer from CuInS_(2)to Ti_(3)C_(2)T_(x)support,resulting in VSformed in CuInS_(2).The strong support effect based on Ti_(3)C_(2)T_(x)is proven to be applicable to prepare a series of different metal indium sulfide arrays with VS.CuInS_(2)nanosheet arrays with VSsupported on Ti_(3)C_(2)T_(x)benefit the photocatalytic selective reduction of CO_(2)to CO,manifesting a remarkable over 14.8-fold activity enhancement compared with pure CuInS_(2).The experimental and computational investigations pinpoint that VSof CuInS_(2)resulting from the support effect of Ti_(3)C_(2)T_(x)lowers the barrier of the rate-limiting step of^(*)COOH→^(*)OH+^(*)CO,which is the key to the photoactivity enhancement.This work demonstrates MXene support effects and offers an effective approach to regulate the atomic microstructure of metal sulfides toward enhancing photocatalytic performance.

关 键 词：Metal sulfides Sulfur vacancies Nanosheet arrays Support effect Selective photocatalytic CO_(2)-to-CO reduction 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]