Energy Storage Science and Technology ›› 2016, Vol. 5 ›› Issue (6): 861-868.doi: 10.12028/j.issn.2095-4239.2016.0052

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Graphene/single-walled carbon nanotube hybrids and applications in supercapacitors

XIE Qing1,2, TIAN Jiarui1, HE Gongfan2, HE Chongchong2, KANG Hui2, WEI Xiaobo2, SUN Jiuming2,#br# QIAN Weizhong1, ZHANG Qiang1, WEI Fei1   

  1. 1Department of Chemical Engineering, Tsinghua University; 2Beijing BeifangGuoneng Technology Co., Ltd.,
    Beijing 100084, China
  • Received:2016-07-20 Revised:2016-08-31 Online:2016-11-01 Published:2016-11-01

Abstract: Supercapacitor, based on electric double-layer capacitance effect, had advantages of high power density and long cycle life. Current focuses to develop new electrode material and high voltage system in order toincrease energy density of device. We reported the preparation of graphene/ single-walled carbon nanotube hybrids (GNH) by chemical vapor deposition method. The materials had huge specific surface area (1200—1800 m2/g), high purity, good dispersion and high chemical stability. It, as the electrode, exhibited high capacitance performance in electrolytes such as KOH at 1 V, Et4NBF4/PC at 2.7 V and ionic liquids at 4 V. Soft-pack capacitors with Et4NBF4/PC electrolyte were also examined by using activated carbon as main electrode and GNHs as conductive additives. All results suggested GNH was an excellent electrode material choice, paving the way for the development of capacitor with high energy density and high power density.

Key words: graphene, carbon nanotube, hybrids, supercapacitor