二维介孔氮掺杂炭/石墨烯纳米片的可控合成及其高性能微型超级电容器

Controllable synthesis of 2D mesoporous nitrogen-doped carbon/graphene nanosheets for high-performance micro-supercapacitors

  • 摘要: 石墨烯基二维介孔材料能够有效耦合石墨烯基底、功能化材料和介孔结构的优势,被认为是一种理想的微型超级电容器电极材料。基于此,本文以苯胺为前驱体,氧化石墨烯为二维导向剂,二氧化硅纳米球为介孔模板,采用双模板界面诱导自组装法制备介孔氮掺杂炭/石墨烯(mNC/G)纳米片,并实现了其介孔孔径的精确调控和电化学性能的优化。研究表明,7 nm孔径的介孔氮掺杂炭/石墨烯(mNC/G-7)展现出267 F g−1的高比电容,且应用于准固态平面微型超级电容器表现出21.0 F cm−3的体积比电容和1.9 mWh cm−3的体积能量密度,证明了该二维介孔氮掺杂炭/石墨烯纳米片在微型超级电容器应用方面具有良好的前景。

     

    Abstract: Graphene-based 2D mesoporous materials have been considered ideal electrode materials for micro-supercapacitors (MSCs). 2D mesoporous nitrogen-doped carbon/graphene (mNC/G) nanosheets were prepared by the solution polymerization of aniline as the carbon and nitrogen precursor, in mixtures of graphene oxide as a guide for the 2D structure and silica nanospheres as a mesopore template. This was followed by leaching with dilute NaOH to remove the silica, freeze drying and carbonization. The nanosheets were formed from the templated mesoporous nitrogen-doped carbon decorating both sides of the graphene sheets. Precise regulation of the mesopore size and optimization of the electrochemical performance of the material were achieved. mNC/G with a pore size of 7 nm (mNC/G-7) had a specific capacitance of 267 F g−1, and quasi-solid-state planar MSCs based on it had a high volumetric capacitance of 21.0 F cm−3 and an energy density of 1.9 mWh cm−3, indicating the tremendous potential of 2D mNC/G for MSCs.

     

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