Outstanding capacitive performance of reticular porous carbon/graphene sheets with superhigh surface area
Outstanding capacitive performance of reticular porous carbon/graphene sheets with superhigh surface area
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超高表面积网状多孔碳/石墨烯片具有出色的电容性能
DOI：
10.1016/j.electacta.2016.01.002
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发表时间：
2016-02
影响因子：
6.6
通讯作者：
Yan Zifeng
中科院分区：
文献类型：
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作者：
Li Xuejin;Zhou Jin;Xing Wei;Subhan Fazle;Zhang Yu;Bai Peng;Xu Benjing;Zhuo Shuping;Xue Qingzhong;Yan Zifeng
以间苯三酚和甲醛为原料，在氧化石墨烯表面进行聚合反应，然后用氢氧化钾活化处理，成功地合成了网状多孔炭/石墨烯薄膜。采用扫描电子显微镜、透射电子显微镜、氮气吸附、X射线光电子能谱、拉曼光谱和傅立叶变换红外光谱等技术对样品的化学结构、物理性能和形貌进行了系统的表征。结果表明，石墨烯纳米片引导酚醛树脂形成层次化的层状结构，具有良好的离子传输通道和较高的电导率(10 2 0 S·m−1)。所制得的片状复合材料在水溶液和离子液体电解液中均被用作超级电容器的电极材料。在电流密度为1A·g−1时，该复合材料在30wt%KOH电解液中的比容为270F·g−1。即使在50A·g−1的极高速率下，该复合材料的比容仍保持在237F·g−1(保留率的87.8%)。在离子液体电解液中，在1500 mA·g−1下，复合材料的比电容达到202F·g−1，能量密度达到63.2WH·kg−1。这些数据表明，这种网状多孔碳/石墨烯薄膜具有显著的电化学性能，在电化学储能方面具有广阔的应用前景。
Reticular porous carbon/graphene sheets have been successfully synthesized via polymerization of phloroglucinol and formaldehyde on the surface of graphene oxide, followed by activation process using KOH. The chemical structure, physical properties and morphology of samples are characterized systematically by means of scanning electron microscopy, transmission electron microscopy, N2adsorption, X-ray photoelectron spectroscopy, Raman spectroscopy and Fourier transform infrared spectroscopy techniques. The results reveal that graphene nanosheet directs the cross-linkage of phenolic novolac resin to form a hierarchical lamellar structure, resulting in its perfect ions transmission channels and high conductivity (1020 S·m−1). The obtained lamellar composite has been exploited as electrode material for supercapacitors in both aqueous electrolyte and ionic liquid electrolyte. This composite exhibits excellent specific capacitance of 270 F·g−1in 30 wt% KOH electrolyte at the current density of 1 A·g−1. The specific capacitance of this composite can still be maintained to a remarkably high value of 237 F·g−1(87.8% of retention ratio) even at a very high rate of 50 A·g−1. In an ionic liquid electrolyte, the highest specific capacitance is evaluated to be 202 F·g−1at 1500 mA·g−1and the energy density of the composite reaches up to a value of 63.2 Wh·Kg−1. These figures indicate that such reticular porous carbon/graphene sheets possess a significantly improved electrochemical performance, suggesting their prosperous application in electrochemical energy storage.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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