Mesoporous carbon decorated graphene as an efficient electrode material for supercapacitors
Mesoporous carbon decorated graphene as an efficient electrode material for supercapacitors
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DOI：
10.1039/c3ta10890b
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发表时间：
2013-06
影响因子：
--
通讯作者：
M. Li;J. Ding;J. Xue
中科院分区：
文献类型：
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作者：
M. Li;J. Ding;J. Xue
通过纳米结构的合理设计，制备了一种新型介孔碳装饰石墨烯（MCG）材料作为超级电容器的有效电极材料。介孔碳层充当石墨烯片聚集的有效抑制剂和电荷积累的场所，而石墨烯片则充当高导电碳框架。与纯石墨烯相比，所获得的MCG电极材料表现出更高的表面积和更有利的孔径分布。使用CV、恒电流充放电和阻抗谱的电化学测量来研究所制造的MCG电极的电化学性能。特别是，结果表明MCG-20电极在0.5 A g−1的电流密度下可以提供高达213.3 F g−1的比电容。其他电化学观察表明，所制造的电极具有降低的 ESR 和出色的循环稳定性。这些结果表明，这种石墨烯基复合材料是高性能超级电容器电极材料的有希望的候选者。
A novel mesoporous carbon decorated graphene (MCG) material was fabricated as an effective electrode material for supercapacitors through the rational design of the nanostructure. The mesoporous carbon layer served as an effective inhibitor of the aggregation of the graphene sheets and a place of charge accumulation, while the graphene sheets acted as a highly conductive carbon frame. Compared to the pure graphene, the as-obtained MCG electrode materials exhibited higher surface area and more favorable pore size distribution. The electrochemical measurements of CV, galvanostatic charge–discharge and the impedance spectrum were used to investigate the electrochemical performance of the as-fabricated MCG electrodes. In particular, the results showed that the MCG-20 electrode could deliver a specific capacitance as high as 213.3 F g−1 at a current density of 0.5 A g−1. The other electrochemical observations revealed that the as-fabricated electrodes offered reduced ESR and excellent cycling stability. Such results demonstrate that this graphene based composite material is a promising candidate for the electrode material for high-performance supercapacitors.