文献类型：期刊文献

中文题名：Electron delocalization-enhanced sulfur reduction kinetics on an MXene-derived heterostructured electrocatalyst

作者：Yunmeng Li[1];Yinze Zuo[2];Xiang Li[1];Yongzheng Zhang[1];Cheng Ma[3];Xiaomin Cheng[4];Jian Wang[4,5];Jitong Wang[1];Hongzhen Lin[4];Licheng Ling[1]

机构：[1]State Key Laboratory of Chemical Engineering,Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education),East China University of Science and Technology,Shanghai 200237,China;[2]Institute of New Energy Materials and Engineering,College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China;[3]Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education),School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;[4]i-Lab&CAS Key Laboratory of Nanophotonic Materials and Device Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China;[5]Helmholtz Institute Ulm(HIU),D89081 Ulm,Germany

年份：2024

卷号：17

期号：8

起止页码：7153

中文期刊名：Nano Research

外文期刊名：纳米研究（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2023_2024】；PubMed;

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).

语种：英文

中文关键词：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 performance.Here,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 effect.Through 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 conversion.In 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 efficiency.Consequently,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 cycles.It 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.