Polyaniline nanowire array encapsulated in titania nanotubes as a superior electrode for supercapacitors

Keyu Xie, Jie Li, Yanqing Lai, Zhi'An Zhang, Yexiang Liu, Guoge Zhang, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

134 Citations (Scopus)

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 TiO2 nanotubes, providing high surface area, fast diffusion path for ions and long-term cycle stability. Such a nanocomposite electrode is attractive for supercapacitor applications.
Original languageEnglish
Pages (from-to)2202-2207
Number of pages6
JournalNanoscale
Volume3
Issue number5
DOIs
Publication statusPublished - 1 May 2011

ASJC Scopus subject areas

  • Materials Science(all)

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