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Titolo:
Multi-technique study of the anodic degradation of polyaniline films
Autore:
Dinh, HN; Ding, JF; Xia, SJ; Birss, VI;
Indirizzi:
Univ Calgary, Dept Chem, Calgary, AB T2N 1N4, Canada Univ Calgary CalgaryAB Canada T2N 1N4 Chem, Calgary, AB T2N 1N4, Canada
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1, volume: 459, anno: 1998,
pagine: 45 - 56
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUARTZ-CRYSTAL MICROBALANCE; CONDUCTIVE POLYMERS; ELECTROCHEMICAL DEGRADATION; SPECTROSCOPIC ELLIPSOMETRY; COATED ELECTRODES; FE SHEETS; MORPHOLOGY; MECHANISM; CORROSION; KINETICS;
Keywords:
polyaniline; ellipsometry; quartz crystal microbalance; transmission electron microscopy; degradation; stability;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Birss, VI Univ Calgary, Dept Chem, Calgary, AB T2N 1N4, Canada Univ Calgary Calgary AB Canada T2N 1N4 gary, AB T2N 1N4, Canada
Citazione:
H.N. Dinh et al., "Multi-technique study of the anodic degradation of polyaniline films", J ELEC CHEM, 459(1), 1998, pp. 45-56

Abstract

Polyaniline (PANI) films, formed by potential cycling methods on Au electrodes in sulfuric acid solutions, were anodically degraded with time at ca. 1 V versus RHE. Ellipsometric and cyclic voltammetric data suggest that colored species are formed within the film, perhaps containing quinone endgroups, and the bulk of the film dissolves uniformly creating greater porosity. This model of film degradation has been supported by transmission electronmicroscopy (TEM) studies of cross-sectional samples of PANI films. Both TEM and ellipsometry also showed that the PANI film is not delaminated, and is very resistant to anodic dissolution/degradation. Concurrent in situ massmeasurements suggest that, in the early stages of film degradation, some regions of the film become electrochemically inactive, although the nature of the charge compensation mechanism of the PANI redox reaction remains unaltered. When no further him degradation can be accomplished, the mass data show that a substantial quantity of largely inactive film material is still present on the electrode surface. Furthermore, the change in the redox potential and the invariant charge compensation stoichiometry suggests that, although the final degraded him is a different material from the newly formedPANI film, only those portions of the him that have PANI characteristics are electrochemically active. (C) 1998 Elsevier Science S.A. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/10/20 alle ore 02:52:57