Highly sp2 hybridized and nitrogen, oxygen dual-doped nanoporous carbon network: Synthesis and application for ionic liquid supercapacitors

作者: Xiao-Ling Dong , Si-Qiong Wang , Bin He , Wen-Cui Li

DOI: 10.1016/J.MICROMESO.2017.06.011

关键词: ElectrolyteInorganic chemistryCarbonConductivitySupercapacitorMaterials scienceSurface modificationIonic liquidGrapheneOxide

摘要: Abstract The utilization of ionic liquids as electrolyte is beneficial for realization high energy density supercapacitors due to their operation voltage. Nevertheless, electrolytes suffer from sluggish ion diffusion and poor wetting behavior on porous electrodes a result large sizes viscosity, which has severely hindered practical use. Herein, highly sp 2 hybridized nitrogen-, oxygen dual-doped nanoporous carbon networks were prepared based charge-induced self-assembly strategy using chitosan precursor with reduced graphene oxide (GO) in between conductive scaffolds. optimized material supercapacitor exhibits an outstanding specific capacitance 201 F g −1 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ) at 0.5 A g maximum 111 Wh kg , superior numerous reported values, are attributed multiple synergistic effects several characteristics, that is, excellent conductivity deduced originated carbonized scaffolds being favor rate performance cyclic stability, nitrogen functionalization improving the surface wettability well contributing capacitance, areas providing abundant active sites boost charge capacity, sheet-like structures effectively shortening pathways improve transports.

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