文献类型：期刊文献

英文题名：High supercapacitance performance of nitrogen-doped Ti3C2Tx prepared by molten salt thermal treatment

作者：Xu, Cong[1];Jiang, Wei-Yan[2,3,4];Guo, Liang[1];Shen, Miao[2,3,4];Li, Bing[1];Wang, Jian-Qiang[2,3,4]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China;[3]Chinese Acad Sci, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China

年份：2022

卷号：403

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20214811252574);WOS:【SCI-EXPANDED(收录号:WOS:000784296000009)】；

语种：英文

外文关键词：Ti3C T-2(x); Mxene; Molten-salt; Nitrogen-doping; Capacitors

摘要：Ti3C2Tx with -F surface terminations were treated in LiCl-KCl-Li3N molten salt at atmospheric pressure to introduce N and simultaneously remove -F surface terminations, in which LiCl-KCl salt was used as the solvent and Li3N as the nitrogen source. By optimizing the mass ratio of Li3N:Ti3C2Tx to be 1:2, N-doped Ti3C2Tx (N-Ti3C2Tx-0.5) was obtained with 19.6 at% nitrogen element and 0.69 at% -F surface terminations, leading to the substitution of C by N atoms and the D-spacing expansion from 0.96 to 1.15 nm. Owing to its good electrical conductivity and high electrochemical activity area, the N-TTi3C2Tx- 0.5 electrode showed a higher specific capacitance (332 F g(-1) at 0.5 A g(-1) in 1 M H2SO4 solution), good rate performance (83.1% at 20 A g(-1)), and excellent capacitance retention (87.5% after 10 0 0 0 charging-discharging cycles). This paves a new way to achieve MXene electrodes with high specific capacitances and excellent retention performance. (c) 2021 Elsevier Ltd. All rights reserved.