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Oxidation of a PPy‐modified tantalum electrode
Author(s) -
Park YoungSeo,
Yamamoto Kimihisa,
Takeoka Shinji,
Ohta Tomoyuki,
Tsuchida Eishun
Publication year - 1993
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1993.220040502
Subject(s) - polypyrrole , tantalum , materials science , electrolysis , electrode , aqueous solution , dopant , phosphoric acid , inorganic chemistry , nuclear chemistry , chemical engineering , polymer chemistry , doping , polymerization , composite material , organic chemistry , chemistry , electrolyte , metallurgy , polymer , optoelectronics , engineering
Abstract A tantalum electrode on which polypyrrole (PPy) had been previously formed by electropolymerization was galvanostatically electrolyzed in an aqueous solution of 0.01 wt% phosphoric acid. This process contains the irreversible oxidation of a PPy film, the decomposition of solvent, and the formation of Ta 2 O 5 by the reaction of OH − coming through the PPy film, with Ta electrodes. A three layer‐structure (PPy/Ta 2 O 5 /Ta) was confirmed by electron spectroscopy for chemical analysis (ESCA). A PPy film containing CIO 4 − as dopant [PPy(CIO 4 − )] was significantly deteriorated in comparison with PPy(TsO − ) at the electrolysis. Therefore, the (PPy(TsO − )/Ta 2 O 5 /Ta) system showed better electrical characteristics as a capacitor than the (PPy(CIO 4 − )/Ta 2 O 5 /Ta) system showed better electrical characteristics as a capacitor than the (PPy(ClO 4 − )/Ta 2 O 5 /Ta) system.