石墨烯/多孔碳气凝胶复合材料的制备及在超级电容器中的应用
首发时间:2017-05-12
摘要:通过溶胶凝胶法制备了三聚氰胺甲醛树脂,然后经过碳化、活化得到高比表面积多孔碳,之后将这种大比表面积多孔碳与氧化石墨溶液、无水乙醇通过溶剂热法得到石墨烯/多孔碳液凝胶,经冷冻干燥得到最终产物石墨烯/多孔碳气凝胶。多孔碳的存在有效阻止了石墨烯的团聚,提高了复合材料的有效比较面积。把该材料用于超级电容器,复合材料兼备多孔碳的高比容量和石墨烯的高倍率性能。复合气凝胶无论在KOH电解液中还是PVA/KOH凝胶电解质中均表现出较高比容量和极好的循环稳定性。
关键词: 材料物理与化学 超级电容器 石墨烯/多孔碳气凝胶 复合材料
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Preparation of graphene/porous carbon aerogel composites for supercapacitors
Abstract:To obtain large surface area porous barbon (LPC), firstly the melamine formaldehyde resin was preapred by a sol-gel method, then it was carbonized and activated. Graphene/LPCaerogel was prepared by freeze-drying the hydrogel of LPC, graphite oxide, ethylene glycol, which was obtained by hydrothermal method. The re-stacking of graphene was highly blocked by the presence of porous caron and high specific surface area was obtained. The supercapacitive properties of composites are higly enhanced by the high specific capacitance of porous carbon and the high conductities of graphene. They exibit high specific capacitance and cycling stabilities not only in the KOH aqueous solution, but also PVA/KOH solid state capacitors.
Keywords: material physics and chemistry supercapacitors graphene/porous carbon aerogel composite
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