Journal
ACS NANO
Volume 7, Issue 7, Pages 5940-5947Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4016345
Keywords
supercapacitors; textile electronics; carbon nanotubes; carbon fibers
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Funding
- Institute for Basic Science (IBS) in Korea
- WCU (World Class University) program through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [R31-2008-10029]
- Basic Science Research Program through the NRF
- MEST [2010-0015035]
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS EM1304] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report a coaxial fiber supercapacitor, which consists of carbon microfiber bundles coated with multiwalled carbon nanotubes as a core electrode and carbon nanofiber paper as an outer electrode. The ratio of electrode volumes was determined by a half-cell test of each electrode. The capacitance reached 6.3 mF cm(-1) (86.8 mF cm(-2)) at a core electrode diameter of 230 mu m and the measured energy density was 0.7 mu Wh cm(-1) (9.8 mu Wh cm(-2)) at a power density of 13.7 mu W cm(-1) (189.4 mu W cm(-2)), which were much higher than the previous reports. The change in the cyclic voltammetry characteristics was negligible at 180 degrees bending, with excellent cycling performance. The high capacitance, high energy density, and power density of the coaxial fiber supercapacitor are attributed to not only high effective surface area due to its coaxial structure and bundle of the core electrode, but also all-carbon materials electrodes which have high conductivity. Our coaxial fiber supercapacitor can promote the development of textile electronics in near future.
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