title: Hybrid nanomembranes for high power and high energy density supercapacitors and their yarn application.
abstract: We report mechanically robust, electrically conductive, free-standing, and transparent hybrid nanomembranes made of densified carbon nanotube sheets that were coated with poly(3,4-ethylenedioxythiophene) using vapor phase polymerization and their performance as supercapacitors. The hybrid nanomembranes with thickness of ~66 nm and low areal density of ~15 μg/cm(2)exhibited high mechanical strength and modulus of 135 MPa and 12.6 GPa, respectively. They also had remarkable shape recovery ability in liquid and at the liquid/air interface unlike previous carbon nanotube sheets. The hybrid nanomembrane attached on a current collector had volumetric capacitance of ~40 F/cm(3) at 100 V s(-1) (~40 and ~80 times larger than that of onion-like carbon measured at 100 V s(-1) and activated carbon measured at 20 V s(-1), respectively), and it showed rectangular shapes of cyclic voltammograms up to ~5 V s(-1). High mechanical strength and flexibility of the hybrid nanomembrane enabled twisting it into microsupercapacitor yarns with diameters of ~30 μm. The yarn supercapacitor showed stable cycling performance without a metal current collector, and its capacitance decrease was only ~6% after 5000 cycles. Volumetric energy and power density of the hybrid nanomembrane was ~70 mWh cm(-3) and ~7910 W cm(-3), and the yarn possessed the energy and power density of ~47 mWh cm(-3) and ~538 W cm(-3).
authors.affiliation: Center for Bio-Artificial Muscle and Department of Biomedical Engineering, Hanyang University, Seoul 133-791, South Korea.
authors.forename: Jae Ah
authors.initials: JA
authors.lastname: Lee
authors.forename: Min Kyoon
authors.initials: MK
authors.lastname: Shin
authors.forename: Shi Hyeong
authors.initials: SH
authors.lastname: Kim
authors.forename: Seon Jeong
authors.initials: SJ
authors.lastname: Kim
authors.forename: Geoffrey M
authors.initials: GM
authors.lastname: Spinks
authors.forename: Gordon G
authors.initials: GG
authors.lastname: Wallace
authors.forename: Raquel
authors.initials: R
authors.lastname: Ovalle-Robles
authors.forename: Márcio D
authors.initials: MD
authors.lastname: Lima
authors.forename: Mikhail E
authors.initials: ME
authors.lastname: Kozlov
authors.forename: Ray H
authors.initials: RH
authors.lastname: Baughman
mesh_terms: D025802:Electric Capacitance; D011211:Electric Power Supplies; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013784:Textiles
chemical_list: D008567:Membranes, Artificial