Publications논문

Hybrid nanomembranes for high power and high energy density supercapacitors and their yarn application.
2012-01-24 11:20:31 조회수742
Jae Ah Lee †, Min Kyoon Shin †, Shi Hyeong Kim †, Seon Jeong Kim †*, Geoffrey M. Spinks ‡, Gordon G. Wallace ‡, Raquel Ovalle-Robles §, Márcio D. Lima §, Mikhail E. Kozlov §, and Ray H. Baughman §* † Center for Bio-Artificial Muscle and Department of Biomedical Engineering, Hanyang University, Seoul 133-791, South Korea ‡ ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia § The Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75083, United States 원문 링크 : http://pubs.acs.org/doi/full/10.1021/nn203640a

Abstract

 

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/cm2exhibited 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/cm3 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.

 
사이트맵 닫기