High-density/efficient surface active sites on modified separators to boost Li-S batteries via atomic Co^(3+)-Se termination

作     者：Shujie Liu Xiaofei Liu Manfang Chen Dong Wang Xin Ge Wei Zhang Xiyang Wang Chunhui Wang Tingting Qin Haozhe Qin Liang Qiao Dan Zhang Xing Ou Weitao Zheng Shujie Liu;Xiaofei Liu;Manfang Chen;Dong Wang;Xin Ge;Wei Zhang;Xiyang Wang;Chunhui Wang;Tingting Qin;Haozhe Qin;Liang Qiao;Dan Zhang;Xing Ou;Weitao Zheng

作者机构：Key Laboratory of Automobile Materials of MOESchool of Materials Science and Engineeringand Electron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130013China Key Laboratory of Materials Design and Quantum SimulationCollege of ScienceChangchun UniversityChangchun 130022China National Base for International Science&Technology CooperationSchool of ChemistryXiangtan UniversityXiangtan 411105China State Key Laboratory of Chem/Bio-Sensing and ChemometricsAdvanced Catalytic Engineering Research Center of the Ministry of EducationCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Mechanical and Mechatronics EngineeringUniversity of WaterlooWaterlooN2L 3G1Canada School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2022年第15卷第8期

页      面：7199-7208页

核心收录：

学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(Nos.52070194,52073309,51902347,51932003,51872115,and 22109135) Science and Technology Development Project of Jilin Province(Nos.YDZJ202101ZYTS165,20210506034ZP,and 20210509051RQ). 

主　　题：high-density surface active sites Co^(3+)-Se covalent bond atomic element terminated Li-S batteries single-crystalline strategy 

摘      要：Various and critical electrocatalytic processes are involved during the redox reactions in the Li-S batteries,which extremely depend on the surface structure and chemical state.Recently,single-atom concept unlocks a route to maximize the use of surface-active atoms,however,further increasing the density of active site is still strictly limited by the inherent structure that single-atoms are only highly-dispersed on substrate.Herein,we provide a viewpoint that an elaborate facet design with singlecrystalline structure engineering can harvest high-density surface active sites,which can significantly boost the electrocatalyst performance for excellent Li-S batteries.Specifically,the single-crystal CoSe_(2)(scCS)exhibits three-types of terminated(011)facet,efficiently obtaining the surface with a high-rich Co^(3+)–Se bond termination,in contrast with lots of surface grain boundaries and dangling bonds in polycrystalline CoSe_(2).Surprisingly,the surface active sites concentration can reach more than 69%.As anticipated,it can provide high-density and high-efficient active sites,enormously suppressing the shuttle effect and improving the reaction kinetics via accelerating the conversion and deposition of polysulfides and Li2S.This surface lattice strategy with element terminated mode is a promising approach for designing electrocatalyst effect-based energy system,not merely for Li-S batteries.