Abstract
The electrochemical properties of a polypyrrole-polyimide composite are studied from the point of view of its prospective use as a material in polymer-based charge-storage devices, that is, rechargeable batteries and supercapacitors. The content of polypyrrole and the polarization potential of the composite are varied in the experiments. The charge behavior of the composite is characterized via potential step amperometry and electrochemical impedance spectroscopy. The results are discussed in terms of various physical models that take into account the formation of charge-transfer complexes and the storage of electric energy in the double electric layer. A relationship is found between the type of doping (cationic or anionic) of the matrix and the filler and the origin of the charge-storage ability: the capacity due to doping or energy storage in the double electric layer.
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