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Titolo:
ELECTROCHEMICAL DEGRADATION OF POLYANILINE IN HCLO4 AND H2SO4
Autore:
ZHANG AQ; CUI CQ; LEE JY;
Indirizzi:
NATL UNIV SINGAPORE,DEPT CHEM ENGN,10 KENT RIDGE CRESCENT SINGAPORE 0511 SINGAPORE NATL UNIV SINGAPORE,DEPT CHEM ENGN SINGAPORE 0511 SINGAPORE
Titolo Testata:
Synthetic metals
fascicolo: 3, volume: 72, anno: 1995,
pagine: 217 - 223
SICI:
0379-6779(1995)72:3<217:EDOPIH>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
CYCLIC POTENTIAL SWEEP; CONDUCTIVE POLYMERS; FILMS; ELECTRODES; POLYPYRROLE; BATTERIES; BEHAVIOR; DISPLAY; DEVICES;
Keywords:
ELECTROCHEMICAL DEGRADATION; POLYANILINE; PERCHLORIC ACID; SULFURIC ACID;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
A.Q. Zhang et al., "ELECTROCHEMICAL DEGRADATION OF POLYANILINE IN HCLO4 AND H2SO4", Synthetic metals, 72(3), 1995, pp. 217-223

Abstract

The ratio of the sum of the second and third anodic current peaks to the first anodic current peak, (I-p,I-B1+1(p,B2))/I-p,I-A, in the cyclic voltammogram of polyaniline in H2SO4, was used to measure the extent of polymer degradation that occurs during electropolymerization. Structural determination by UV-Vis spectroscopy and morphology examination by scanning electron microscopy verified that a large ratio is indicative of a more extensive degradation. The ratio was found to vary with the number of deposition cycles. It decreased initially to a minimumand then increased to a steady state value. It is postulated that theinitial decline was caused by a transition in the reaction mechanism for radical-cation generation, whereas the increase after the minimum was caused by ion-pair formation between sulfate anions and the polymer chains. Mass transfer limitations eventually set in, leading to the saturation of the ratio at the steady state value.

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Documento generato il 29/11/20 alle ore 06:17:54