Raman characterization of pseudocapacitive behavior of polypyrrole on nanoporous gold

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

doi:10.1039/c3cp54497d

Raman characterization of pseudocapacitive behavior of polypyrrole on nanoporous gold

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

50 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 language	English
Pages (from-to)	3523-3528
Number of pages	6
Journal	Physical Chemistry Chemical Physics
Volume	16
Issue number	8
DOIs	https://doi.org/10.1039/c3cp54497d
Publication status	Published - 2014 Feb 28
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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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.",

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AU - Hou, Y.

AU - Zhang, L.

AU - Chen, L. Y.

AU - Liu, P.

AU - Hirata, A.

AU - Chen, M. W.

PY - 2014/2/28

Y1 - 2014/2/28

N2 - 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.

AB - 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.

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Raman characterization of pseudocapacitive behavior of polypyrrole on nanoporous gold

Abstract

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