A Novel Strategy of In Situ Trimerization of Cyano Groups Between the Ti3C2Tx(MXene) Interlayers for High-Energy and High-Power Sodium-Ion Capacitors  

作　　者：Siyang Liu Fangyuan Hu Wenlong Shao Wenshu Zhang Tianpeng Zhang Ce Song Man Yao Hao Huang Xigao Jian 

机构地区：[1]School of Materials Science and Engineering,State Key Laboratory of Fine Chemicals,Key Laboratory of Energy Materials and Devices(Liaoning Province),Dalian University of Technology,Dalian 116024,People’s Republic of China [2]State Key Laboratory of Fine Chemicals,Department of Polymer Science and Engineering,Dalian University of Technology,Dalian 116024,People’s Republic of China [3]School of Mathematical Sciences,Dalian University of Technology,Dalian 116024,People’s Republic of China

出　　处：《Nano-Micro Letters》2020年第10期177-191,共15页纳微快报（英文版）

基　　金：the support from the National Key Research and Development Program(No.2018YFB1107500);the National Natural Science Foundation of China(No.51503024);the Fundamental Research Funds for the Central Universities(Nos.DUT17RC(3)003,DUT18RC(4)033);the National Natural Science Foundation of the Joint Fund Key Projects(No.U1663226)。

摘　　要：2D MXenes are attractive for energy storage applications because of their high electronic conductivity.However,it is still highly challenging for improving the sluggish sodium(Na)-ion transport kinetics within the MXenes interlayers.Herein,a novel nitrogen-doped Ti3C2Tx MXene was synthesized by introducing the in situ polymeric sodium dicyanamide(Na-dca)to tune the complex terminations and then utilized as intercalation-type pseudocapacitive anode of Na-ion capacitors(NICs).The Na-dca can intercalate into the interlayers of Ti3C2 Tx nanosheets and simultaneously form sodium tricyanomelaminate(Na3TCM)by the catalyst-free trimerization.The as-prepared Ti3C2Tx/Na3TCM exhibits a high N-doping of 5.6 at.%in the form of strong Ti-N bonding and stabilized triazine ring structure.Consequently,coupling Ti3C2Tx/Na3 TCM anode with different mass of activated carbon cathodes,the asymmetric MXene//carbon NICs are assembled.It is able to deliver high energy density(97.6 Wh kg-1),high power output(16.5 kW kg-1),and excellent cycling stability(≈82.6%capacitance retention after 8000 cycles).

关 键 词：Sodium-ion capacitors MXene Fast kinetics Triazine polymerization Nitrogen doping 

分 类 号：TM53[电气工程—电器]