Journal
JOURNAL OF POWER SOURCES
Volume 241, Issue -, Pages 423-428Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.04.105
Keywords
Supercapacitor; Graphene; Carbon nanotube; PANI
Funding
- JSPS [19310081, 22310074]
- JST ALCA Program
- Nanotechnology Network Project of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Grants-in-Aid for Scientific Research [19310081, 22310074] Funding Source: KAKEN
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Graphene and single-walled carbon nanotube (CNT) composites are explored as the electrodes for supercapacitors by coating polyaniline (PANI) nano-cones onto the graphene/CNT composite to obtain graphene/CNT-PANI composite electrode. The graphene/CNT-PANI electrode is assembled with a graphene/CNT electrode into an asymmetric pseudocapacitor and a highest energy density of 188 Wh kg(-1) and maximum power density of 200 kW kg(-1) are achieved. The structure and morphology of the graphene/CNT composite and the PANI nano-cone coatings are characterized by both scanning electron microscopy and transmission electron microscopy. The excellent performance of the assembled supercapacitors is also discussed and it is attributed to (i) effective utilization of the large surface area of the three-dimensional network structure of graphene-based composite, (ii) the presence of CNT in the composite preventing graphene from re-stacking, and (ii) uniform and vertically aligned PANI coating on graphene offering increased electrical conductivity. (C) 2013 Elsevier B.V. All rights reserved.
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