MXene has given great promises to superca-pacitor electrode material due to its high conductivity and redox properties.However,the self-agglomeration of the MXene lamella will reduce its contact area with the elec-trolyte and generate a tortuous transportation pathway of the electrolyte ions,thereby reducing its capacitive per-formance and rate capability.In this work,we engineered the electrolyte ion channels by adjusting the MXene lamella size and inserting holey graphene(HG)nanosheets into the interlayer of the MXene flakes.The developed MXene/HG electrode can not only avoid the self-restack-ing of MXene but also provide unimpeded ion transport channels.As a result,the supercapacitive and rate perfor-mances of the small MXene lamella-based MXene/HG(S-MXene/HG)supercapacitor are prominently ameliorated.By adjusting the content of HG,the S-MXene/HG0.05 electrode exhibits excellent gravimetric capacitance of 446 F·g-1 and a rate capability of 77.5％.The S-MXene/HG0.05-based symmetric supercapacitor provides an impressive energy density of 14.84 Wh·kg-1 with excellent cyclic stability of 96％capacitance retention after 10,000 cycles.This demonstration of the engineering of the ion channels shows great potential in two-dimensional mate-rial-based supercapacitor electrodes.

Zhuo Cai;Yi-Fei Ma;Mei Wang;A.-Niu Qian;Zhao-Min Tong;Lian-Tuan Xiao;Suo-Tang Jia;Xu-Yuan Chen

State Key Laboratory of Quantum Optics and Quantum Optics Devices,Collaborative Innovation Center of Extreme Optics,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Institute of Resources and Environment Engineering,Shanxi University,Taiyuan 030006,China;Department of Microsystems,Faculty of Technology,Natural Sciences and Maritime Sciences,University of Southeast Norway,Borre N3184,Norway

稀有金属（英文版）

[1]Zhuo Cai;Yi-Fei Ma;Mei Wang;A.-Niu Qian;Zhao-Min Tong;Lian-Tuan Xiao;Suo-Tang Jia;Xu-Yuan Chen-.Engineering of electrolyte ion channels in MXene/holey graphene electrodes for superior supercapacitive performances)[J].稀有金属（英文版）,2022(06):2084-2093

superca,restack,unimpeded,HG0

Engineering,electrolyte,channels,MXene,holey,graphene,electrodes,superior,supercapacitive,performances,has,given,great,promises,material,due,high,conductivity,redox,properties,However,self,agglomeration,lamella,will,reduce,contact,area,generate,tortuous,transportation,pathway,ions,thereby,reducing,capability,In,this,work,engineered,adjusting,size,inserting,nanosheets,into,interlayer,flakes,developed,can,not,only,avoid,but,also,result,small,supercapacitor,prominently,ameliorated,By,content,exhibits,excellent,gravimetric,capacitance,symmetric,provides,impressive,energy,density,Wh,cyclic,stability,retention,after,cycles,This,demonstration,engineering,shows,potential,two,dimensional

0.455728