Hybrid Nanomembranes for High Power and High Energy Density Supercapacitors and Their Yarn Application
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- 作者：Jae Ah Lee ; Min Kyoon Shin ; Shi Hyeong Kim ; Seon Jeong Kim ; Geoffrey M. Spinks ; Gordon G. Wallace ; Raquel Ovalle-Robles ; M谩rcio D. Lima ; Mikhail E. Kozlov ; Ray H. Baughman
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：January 24, 2012
- 年：2012
- 卷：6
- 期：1
- 页码：327-334
- 全文大小：503K
- 年卷期：v.6,no.1(January 24, 2012)
- ISSN：1936-086X
文摘
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 渭g/cm<sup>2sup>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<sup>3sup> at 100 V s<sup>鈥?sup> (40 and 80 times larger than that of onion-like carbon measured at 100 V s<sup>鈥?sup> and activated carbon measured at 20 V s<sup>鈥?sup>, respectively), and it showed rectangular shapes of cyclic voltammograms up to 5 V s<sup>鈥?sup>. High mechanical strength and flexibility of the hybrid nanomembrane enabled twisting it into microsupercapacitor yarns with diameters of 30 渭m. 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<sup>鈥?sup> and 7910 W cm<sup>鈥?sup>, and the yarn possessed the energy and power density of 47 mWh cm<sup>鈥?sup> and 538 W cm<sup>鈥?sup>.