三维多孔石墨烯在高倍率超级电容器中的应用

Three-dimensional porous graphene enabled high rate performance supercapacitors

以商业化活性炭(AC)、活性炭-石墨烯复合材料(AC-GR)以及活性炭-三维多孔石墨烯复合材料(AC-3DGR)作为超级电容器电极材料,分别组装成扣式器件并进行性能对比测试,着重研究了3DGR对超级电容器倍率性能提升的影响。结果显示,在低倍率条件下(0.1 A/g),AC-3DGR扣式器件的比容量(19.98 C/g)与AC(20.68 C/g)接近,高于AC-GR的比容量(16.88 C/g);而在高倍率条件下(15 A/g),AC-3DGR扣式器件的比容量可达8.01 C/g,而AC器件的比容量仅为4.19 C/g,这归因于3DGR良好的孔道结构。AC-3DGR器件在不牺牲容量性能的前提下,提升了超级电容器的倍率性能,这为进一步优化三维多孔石墨烯基超级电容器提供了实验基础。

In this paper,activated carbon(AC)、activated carbon/graphene composite(AC-GR)and activated carbon/three-dimensional porous graphene composite(AC-3 DGR)were used as electrode materials of supercapacitor,respectively.The role of 3 DGR in the rate performance improvement of supercapacitor was studied.At low current density(0.1 A/g),there is no significant difference on specific capacity between AC-3 DGR(19.98 C/g)and AC(20.68 C/g),which is higher than that of AC-GR(16.88 C/g).Nevertheless,the AC-3 DGR(8.01 C/g)show higher rate performance than that of AC(4.19 C/g)at high current density(15 A/g)due to the pore structure of 3 DGR.AC-3 DGR can greatly improve the rate performance of supercapacitor devices while maintaining the specific capacity of AC.This lays a good experimental basis for further optimizing the design and construction of 3 DGR-based supercapacitors.