title: High-power supercapacitor electrodes from single-walled carbon nanohorn/nanotube composite.
abstract: A novel composite is presented as a supercapacitor electrode with a high maximum power rating (990 kW/kg; 396 kW/l) exceeding power performances of other electrodes. The high-power capability of the electrode stemmed from its unique meso-macro pore structure engineered through the utilization of single-walled carbon nanotubes (20 wt %) as scaffolding for single-walled carbon nanohorns (80 wt %). The novel composite electrode also exhibited durable operation (6.5% decline in capacitance over 100 000 cycles) as a result of its monolithic chemical composition and mechanical stability. The novel composite electrode was benchmarked against another high-power electrode made from single-walled carbon nanotubes (Bucky paper electrode). While the composite electrode had a lower surface area compared to the Bucky paper electrode (280 vs 470 m(2)/g from nitrogen adsorption), it had a higher meso-macro pore volume (2.6 vs 1.6 mL/g from mercury porosimetry) which enabled the composite electrode to retain more electrolyte, ensuring facile ion transport, hence achieving a higher maximum power rating (970 vs 400 kW/kg).
authors.affiliation: Nanotube Research Center, Tsukuba, National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8565, Japan.
authors.forename: Ali
authors.initials: A
authors.lastname: Izadi-Najafabadi
authors.forename: Takeo
authors.initials: T
authors.lastname: Yamada
authors.forename: Don N
authors.initials: DN
authors.lastname: Futaba
authors.forename: Masako
authors.initials: M
authors.lastname: Yudasaka
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Takagi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Hatori
authors.forename: Sumio
authors.initials: S
authors.lastname: Iijima
authors.forename: Kenji
authors.initials: K
authors.lastname: Hata