title: Polyaniline nanowire array encapsulated in titania nanotubes as a superior electrode for supercapacitors.
abstract: Conducting polymer with 1D nanostructure exhibits excellent electrochemical performances but a poor cyclability that limits its use in supercapacitors. In this work, a novel composite electrode made of polyaniline nanowire-titania nanotube array was synthesized via a simple and inexpensive electrochemical route by electropolymerizing aniline onto an anodized titania nanotube array. The specific capacitance was as high as 732 F g(-1) at 1 A g(-1), which remained at 543 F g(-1) when the current density was increased by 20 times. 74% of the maximum energy density (36.6 Wh kg(-1)) was maintained even at a high power density of 6000 W kg(-1). An excellent long cycle life of the electrode was observed with a retention of ∼86% of the initial specific capacitance after 2000 cycles. The good electrochemical performance was attributed to the unique microstructure of the electrode with disordered PANI nanowire arrays encapsulated inside the TiO(2) nanotubes, providing high surface area, fast diffusion path for ions and long-term cycle stability. Such a nanocomposite electrode is attractive for supercapacitor applications.
authors: School of Metallurgical Science and Engineering, Central South University, Changsha, Hunan, 410083, China.
authors: Keyu
authors: K
authors: Xie
authors: Jie
authors: J
authors: Li
authors: Yanqing
authors: Y
authors: Lai
authors: Zhi'an
authors: Z
authors: Zhang
authors: Yexiang
authors: Y
authors: Liu
authors: Guoge
authors: G
authors: Zhang
authors: Haitao
authors: H
authors: Huang
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D025802:Electric Capacitance; D004566:Electrodes; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D000814:Aniline Compounds; D046911:Macromolecular Substances; C416807:polyaniline