title: Coaxial fiber supercapacitor using all-carbon material electrodes.
abstract: 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 μm and the measured energy density was 0.7 μWh cm(-1) (9.8 μWh cm(-2)) at a power density of 13.7 μW cm(-1) (189.4 μW cm(-2)), which were much higher than the previous reports. The change in the cyclic voltammetry characteristics was negligible at 180° 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.
authors.affiliation: IBS Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Daejon 305-701, Republic of Korea.
authors.forename: Viet Thong
authors.initials: VT
authors.lastname: Le
authors.forename: Heetae
authors.initials: H
authors.lastname: Kim
authors.forename: Arunabha
authors.initials: A
authors.lastname: Ghosh
authors.forename: Jaesu
authors.initials: J
authors.lastname: Kim
authors.forename: Jian
authors.initials: J
authors.lastname: Chang
authors.forename: Quoc An
authors.initials: QA
authors.lastname: Vu
authors.forename: Duy Tho
authors.initials: DT
authors.lastname: Pham
authors.forename: Ju-Hyuck
authors.initials: JH
authors.lastname: Lee
authors.forename: Sang-Woo
authors.initials: SW
authors.lastname: Kim
authors.forename: Young Hee
authors.initials: YH
authors.lastname: Lee
mesh_terms: D025802:Electric Capacitance; D004553:Electric Conductivity; D004566:Electrodes; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D013499:Surface Properties
chemical_list: D037742:Nanotubes, Carbon