title: Graphene Carbon Nanotube Carpets Grown Using Binary Catalysts for High-Performance Lithium-Ion Capacitors.
abstract: Here we show that a versatile binary catalyst solution of Fe3O4/AlOxnanoparticles enables homogeneous growth of single to few-walled carbon nanotube (CNT) carpets from three-dimensional carbon-based substrates, moving past existing two-dimensional limited growth methods. The binary catalyst is composed of amorphous AlOxnanoclusters over Fe3O4crystalline nanoparticles, facilitating the creation of seamless junctions between the CNTs and the underlying carbon platform. The resulting graphene-CNT (GCNT) structure is a high-density CNT carpet ohmically connected to the carbon substrate, an important feature for advanced carbon electronics. As a demonstration of the utility of this approach, we use GCNTs as anodes and cathodes in binder-free lithium-ion capacitors, producing stable devices with high-energy densities (∼120 Wh kg-1), high-power density capabilities (∼20,500 W kg-1at 29 Wh kg-1), and a large operating voltage window (4.3 to 0.01 V).
authors.forename: Rodrigo Villegas
authors.initials: RV
authors.lastname: Salvatierra
authors.forename: Dante
authors.initials: D
authors.lastname: Zakhidov
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University , Tianjin 300350, China.|Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300350, China.
authors.forename: Junwei
authors.identifier: 0000-0002-5211-8663
authors.initials: J
authors.lastname: Sha
authors.forename: Nam Dong
authors.initials: ND
authors.lastname: Kim
authors.forename: Seoung-Ki
authors.initials: SK
authors.lastname: Lee
authors.forename: Abdul-Rahman O
authors.initials: AO
authors.lastname: Raji
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University , Tianjin 300350, China.|Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300350, China.
authors.forename: Naiqin
authors.initials: N
authors.lastname: Zhao
authors.forename: James M
authors.identifier: 0000-0002-8479-9328
authors.initials: JM
authors.lastname: Tour
keywords: aluminum oxide; graphene-carbon nanotube junctions; iron oxide; lithium-ion capacitor; nanoparticles