Sandwich-like nitrogen-enriched porous carbon/graphene composites as electrodes for aqueous symmetric supercapacitors with high energy density
Sandwich-like nitrogen-enriched porous carbon/graphene composites as electrodes for aqueous symmetric supercapacitors with high energy density
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三明治状富氮多孔碳/石墨烯复合材料作为高能量密度水对称超级电容器的电极
DOI:
10.1016/j.electacta.2015.12.087
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发表时间:
2016-01
影响因子:
6.6
通讯作者:
吴世华
中科院分区:
文献类型:
--
作者:
吴世华
Sandwich-like nitrogen-enriched porous carbon/graphene composites were prepared by carbonization of polyacrylonitrile (PAN) nanofiber paper with bulk-doped and/or surface-coated graphene oxide (GO), and followed by activation with KOH at high temperatures. The composites exhibit high specific surface areas in a range of 1957.2–2631.8 m2g−1, as well as superior energy storage capability as electrodes for supercapacitors. A very high specific capacitance of 381.6 F g−1at a current density of 0.1 A g−1was achieved in 6 M KOH aqueous electrolyte for N-ACGrF@Gr1 that contains two types of graphene. According to the investigation results, the surface-coated graphene plays a more positive effect on improved supercapacitance than the bulk-doped graphene in the composites. Additionally, the assembled aqueous symmetric supercapacitors deliver a high energy density of 13.2 W h kg−1at a power density of 25.0 W kg−1, and 8.3 W h kg−1at 4.7 kW kg−1with a retention rate of 62.9%.
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