Raman characterization of pseudocapacitive behavior of polypyrrole on nanoporous gold

Y. Hou, L. Zhang, L. Y. Chen, P. Liu, A. Hirata, M. W. Chen

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The practical applications of high-capacitance polypyrrole (PPy) as an active material for electrochemical supercapacitors are mainly limited by their poor cycling stability. By utilizing nanoporous gold enhanced Raman scattering of PPy, we investigated ex situ and in situ the structural origins of the low electrochemical stability of PPy. This study provided direct evidence that the stability degradation of PPy is caused by the irreversible transition between oxidation and reduction states of PPy, which is associated with the permanent deformation of PPy molecular chains subjected to applied potentials.

Original languageEnglish
Pages (from-to)3523-3528
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number8
DOIs
Publication statusPublished - 2014 Feb 28

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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