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Impedance Analysis of Charge Transport and Redox Reactions of Polypyrrole at Polypyrrole‐coated Electrodes
Author(s) -
Chang CmurMin,
Song ChiShyang,
Huang HsuanJung
Publication year - 1994
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199400098
Subject(s) - polypyrrole , chemistry , redox , electrode , conductive polymer , capacitance , electrolyte , electrochemistry , analytical chemistry (journal) , chemical engineering , inorganic chemistry , organic chemistry , engineering
Charge transport accompanying the redox reactions of polypyrrole at a polypyrrole‐coated electrode was investigated with systems containing selected electrolytes. From cyclic voltammeiric and impedance data, we found transport of anions into and from the polymer film to be responsible for the charge‐transfer process accompanying the oxidation and reduction of polypyrrole. With parameters such as charge‐transfer resistance, R el , low‐frequency polymer resistance, R l limiting capacitance, C l and diffusion coefficient, D el estimated, the electrochemical behaviour of polypyrrole as an electronic insulator and conductor is explicitly identified.