Electron delocalization-enhanced sulfur reduction kinetics on an MXene-derived heterostructured electrocatalyst

作     者：Yunmeng Li Yinze Zuo Xiang Li Yongzheng Zhang Cheng Ma Xiaomin Cheng Jian Wang Jitong Wang Hongzhen Lin Licheng Ling Yunmeng Li;Yinze Zuo;Xiang Li;Yongzheng Zhang;Cheng Ma;Xiaomin Cheng;Jian Wang;Jitong Wang;Hongzhen Lin;Licheng Ling

作者机构：State Key Laboratory of Chemical EngineeringKey Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education)East China University of Science and TechnologyShanghai 200237China Institute of New Energy Materials and EngineeringCollege of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education)School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China i-Lab&CAS Key Laboratory of Nanophotonic Materials and Device Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Helmholtz Institute Ulm(HIU)D89081 UlmGermany 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2024年第17卷第8期

页      面：7153-7162页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(No.U1710252) the Natural Science Foundation of Jiangsu Province(BK.20210130) Innovative and Entrepreneurial Doctor in Jiangsu Province(No.JSSCBS20211428) China Postdoctoral Science Foundation(No.2023M731084) Shanghai Sailing Program of China(No.23YF1408900) the Fundamental Research Funds for the Central Universities(No.JKD01231701) 

主　　题：delocalized electron lithium sulfur batteries MXene-based heterostructures catalytic desolvation multi-catalytic sites 

摘      要：Lithium-sulfur(Li-S)batteries mainly rely on the reversible electrochemical reaction of between lithium ions(Li^(+))and sulfur species to achieve energy storage and conversion,therefore,increasing the number of free Li^(+)and improving the Li^(+)diffusion kinetics will effectively enhance the cell ***,Mo-based MXene heterostructure(MoS_(2)@Mo_(2)C)was developed by partial vulcanization of Mo_(2)C MXene,in which the introduction of similar valence S into Mo-based MXene(Mo_(2)C)can create an electron delocalization *** theoretical simulations and electrochemical characterisation,it is demonstrated that the MoS_(2)@Mo_(2)C heterojunction can effectively promote ion desolvation,increase the amount of free Li^(+),and accelerate Li^(+)transport for more efficient polysulfide *** addition,the MoS_(2)@Mo_(2)C material is also capable of accelerating the oxidation and reduction of polysulfides through its sufficient defects and vacancies to further enhance the catalytic ***,the Li-S battery with the designed MoS_(2)@Mo_(2)C electrocatalyst performed for 500 cycles at 1 C and still maintained the ideal capacity(664.7 mAh·g^(−1)),and excellent rate performance(567.6 mAh·g^(−1)at 5 C).Under the extreme conditions of high loading,the cell maintained an excellent capacity of 775.6 mAh·g^(−1)after 100 *** also retained 838.4 mAh·g^(−1)for 70 cycles at a low temperature of 0℃,and demonstrated a low decay rate(0.063%).These results indicate that the delocalized electrons effectively accelerate the catalytic conversion of lithium polysulfide,which is more practical for enhancing the behaviour of Li-S batteries.