Size-refinement enhanced flexibility and electrochemical performance of MXene electrodes for flexible waterproof supercapacitors

查看全文 作　　者：Jinkun [1,2]Sun;Yingjian [3]Liu;Jiayi [1]Huang;Jiatian [1]Li;Mengmeng [1]Chen;Xiaoyu [1]Hu;Yatao [2]Liu;Run [1]Wang;Yanan [1]Shen;Jingjing [1]Li;Xuecheng [4]Chen;Dong [3]Qian;Baigang [2]An;Zunfeng [1,2]Liu 机构地区：[1]Key Laboratory of Functional Polymer Materials,College of Chemistry and College of Pharmacy,State Key Laboratory of Medicinal Chemical Biology,Frontiers Science Center for New Organic Matter,Nankai University,Tianjin 300071,China;[2]School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;[3]Department of Mechanical Engineering,The University of Texas at Dallas,Richardson,TX 75080,United States;[4]Nanomaterials Physicochemistry Department,Faculty of Chemical Technology and Engineering,West Pomeranian University of Technology,Szczecin,Piastów Ave.42,71-065 Szczecin,Poland 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第12期,共11页 基　　金：supported by the National Key Research and Development Program of China(grant SQ2019YFE012189,grant2017YFB0307001);the National Natural Science Foundation of China(grants 51973093,U1533122,and 51773094);the Natural Science Foundation of Tianjin(grant number 18JCZDJC36800);the National Special Support Plan for High-level Talents people(grant number C041800902);the Science Foundation for Distinguished Young Scholars of Tianjin(grant number 18JCJQJC46600);the Frontiers Science Center for New Organic Matter(Grant Number 63181206);the Fundamental Research Funds for the Central Universities(grant 63171219);the State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University(grant LK1704)。 摘　　要：Increasing mechanical flexibility without sacrificing electrochemical performance of the electrode material is highly desired in the design of flexible electrochemical energy storage devices.In metal-related materials science,decreasing the grain size introduces more grain boundaries;this stops dislocations and crack propagation under deformation,and results in increased strength and toughness.However,such a size refinement effect has not been considered in the mechanical properties,particle stacking,wetting,and electrochemical performances of flexible supercapacitor electrodes.In this paper,MXene was used as an electrode material to study the size refinement effect of flexible supercapacitors.Size refinement improved the strength and toughness of the MXene electrodes,and this resulted in increased flexibility.Finite elemental analysis provided a theoretical understanding of size refinement-increased flexibility.Moreover,the size refinement also improved the specific surface area,electric conductance,ion transportation,and water wetting properties of the electrode,and the size refinement provided highly increased energy density and power density of the MXene supercapacitors.A highly flexible,water-proof supercapacitor was fabricated using size-refined MXene.The current study provides a new viewpoint for designing tough and flexible energy storage electrodes.The size refinement effect may also be applicable for metal ion batteries and electronic and photo devices composed of MXene and other nanoparticles. 关 键 词：Grain refinement Flexible supercapacitor Size grading MXene