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Effect of Electrolytes on Redox Reactivity of Polypyrrole
Author(s) -
Kim D. Y.,
Kim J. K.,
Lee J. Y.,
Rhee H. W.,
Kim C. Y.
Publication year - 1997
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/(sici)1099-1581(199704)8:4<184::aid-pat632>3.0.co;2-9
Subject(s) - polypyrrole , redox , cyclic voltammetry , electrolyte , reactivity (psychology) , perchlorate , half reaction , inorganic chemistry , polymerization , dopant , materials science , supporting electrolyte , electrochemistry , conductive polymer , polymer chemistry , polymer , ion , chemistry , doping , electrode , organic chemistry , medicine , alternative medicine , optoelectronics , pathology , composite material
Doping and dedoping characteristics of polypyrrole (PPy) formed electrochemically have been examined by means of energy‐dispersive X‐ray spectroscopy (EDS). Dodecylsulfate ions (DS − ) and perchlorate ions (ClO − 4 ) were embedded simultaneously in PPy when both ions were present on the polymerization of pyrrole. Sequential formation of PPy in the single dopant system allowed PPy/ClO 4 to grow in the bulk of PPy/DS but not vice versa. DS − was embedded not to leave the polymer on reduction but ClO − 4 moved in and out of the polymer on redox reaction. Cyclic voltammetry was employed to determine the redox reactivity of PPy in different electrolyte systems. NaClO 4 was a better electrolyte for cyclic redox reaction than LiClO 4 or KClO 4 . NaCl was a good electrolyte for cyclic redox reaction but Cl − failed to penetrate in the PPy/DS bulk on reoxidation. The cyclic redox reactivity lasted longest when PPy/DS was redox‐cycled sequentially in the NaCl electrolyte system and then in the NaClO 4 system. © 1997 John Wiley & Sons, Ltd.