期刊
CHEMISTRY OF MATERIALS
卷 27, 期 6, 页码 2107-2113出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm504618r
关键词
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资金
- National Natural Science Foundation of China [21373255, 21403274]
- Hundred Talent Program of the Chinese Academy of Sciences [2013SCXQT01, 201SYCR001]
- Young Research Fund of the Institute of Coal Chemistry, Chinese Academy of Sciences [2014SCXQT01]
A high-rate graphene-based supercapacitor is very attractive for the practical application of graphene. Here, we first synthesized the films of the hybrids of biomass cellulose and large literal sheet sizes and weakly defective graphene flakes reaching high thermal conductivity and then converted them into hierarchical porous graphene carbon materials reaching superior supercapacity. The interconnected porous carbon framework, with macroporous walls sandwiched by micro/mesoporous activated carbon covering graphene flakes, was synthesized by template-free low-temperature activation of the cellulose/graphene hybrids at 650 degrees C. The graphene flakes could probably assist both the decrease in the temperature of the chemical activation of cellulose and the formation of the hierarchical carbon pores without destroying their sp(2) bonds. The porous graphene carbon-based supercapacitors exhibit a reversible specific capacitance of similar to 300 F/g and ultrahigh energy storage performance of 67 Wh/kg, 54 Wh/L, and 60 kW/kg over a 45 s discharge time.
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