期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 8, 页码 3523-3528出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp54497d
关键词
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资金
- JST-CREST Phase Interface Science for Highly Efficient Energy Utilization'' project
- World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials, MEXT, Japan
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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