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Electrochemical deposition of polyaniline–polypyrrole composite coatings on aluminum
Author(s) -
Akundy Gouri Smitha,
Rajagopalan Ramakrishnan,
Iroh Jude O.
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10123
Subject(s) - polypyrrole , polyaniline , cyclic voltammetry , materials science , composite number , saturated calomel electrode , conductive polymer , horizontal scan rate , electrochemistry , supporting electrolyte , electrolyte , chemical engineering , anode , electrode , composite material , analytical chemistry (journal) , polymer , polymerization , chemistry , working electrode , organic chemistry , engineering
The electrodeposition of polyaniline–polypyrrole composite coatings on aluminum was successfully performed by using cyclic voltammetry. Oxalic acid was used as the electrolyte. Electrodeposition was carried out at a scan rate of 20 mV/s by varying the number of cycles. An anodic peak current at around −0.1 V versus saturated calomel electrode (SCE) was observed in the cyclic voltammograms. This peak is due to the oxidation and adsorption of hydrogen. The cyclic voltammograms also show another anodic peak current at around 1.0 V versus SCE, which is the characteristic peak of the polyaniline–polypyrrole composite. The behavior of this peak with respect to the number of cycles is discussed in detail. A corresponding cathodic peak current at around −0.7 V versus SCE was also observed in the cyclic voltammograms. The infrared spectra of the composite coatings revealed the infrared peaks of both polypyrrole and polyaniline. The scanning electron micrographs of the coatings indicate a morphology completely different from its homopolymers. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1970–1977, 2002