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Facile synthesis of colloidal nitrogen-doped titanium carbide sheets with enhanced electrochemical performance

查看全文 作　　者：Tianlun [1]Qiu;Guohui [1]Li;Yuanlong [2]Shao;Kun [1]Jiang;Fangfang [1]Zhao;Fengxia [1,2]Geng 高影响力作者 机构地区：[1]College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou,China;[2]College of Energy,Soochow Institute for Energy and Materials Innovations,Soochow University,Suzhou,China高影响力机构 出　　处：《Carbon Energy》索引2020年第2卷第4期,共11页高影响力期刊 基　　金：The authors acknowledge the financial support from the National Natural Science Foundation of China(Grant no.51772201);Jiangsu Specially-Appointed Professor Program;a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions. 摘　　要：Heteroatom nitrogen doping in two-dimensional transition metal carbides,known as MXenes,has been considered as a promising strategy for modulating their electronic structure and electrochemical reactivity.While hightemperature annealing in the presence of a nitrogen source has been one popular method to introduce nitrogen,annealing exfoliated multilayered MXenes typically brings about incomplete delamination and the treatment of delaminated monolayer MXenes often leads to irreversible restacking.Here,starting from the typical carbide precursor,we developed an aqueous colloid containing monolayered nitrogen-doped titanium carbide sheets with excellent dispersity and stability.This achievement is critically dependent on the retaining of the hydrophilic surface of host layers during annealing treatment.The successful realization of nitrogen doping into individual MXene monolayers resulted in enhanced electrical conductivity and redox reactivity,for which the sample exhibited excellent capacitive electrochemical performance(586 F/g at a scan rate of 5mV/s)and cycling stability(capacitance retention of 96.2%after 104 cycles at 5 A/g).This paper presents a feasible and simple strategy for designing nitrogen-doped MXenes colloid,the realization of which promises its facile uses in liquid phase engineering techniques toward versatile applications. 关 键 词：asymmetric supercapacitor MXenes nitrogen doping two-dimensional materials
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