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Titolo:
Separation of transport, charge storage and reaction processes of porous electrocatalytic IrO2 and IrO2/Nb2O5 electrodes
Autore:
Terezo, AJ; Bisquert, J; Pereira, EC; Garcia-Belmonte, G;
Indirizzi:
Univ Fed Sao Carlos, Dept Quim, BR-13560905 Sao Carlos, SP, Brazil Univ Fed Sao Carlos Sao Carlos SP Brazil BR-13560905 BCCarlos, SP, Brazil Univ Jaume 1, Dept Ciencies Expt, Castello 12080, Spain Univ Jaume 1 Castello Spain 12080 t Ciencies Expt, Castello 12080, Spain
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 508, anno: 2001,
pagine: 59 - 69
Fonte:
ISI
Lingua:
ENG
Soggetto:
IRIDIUM OXIDE-FILMS; OXYGEN EVOLUTION; ELECTROCHEMICAL IMPEDANCE; ALKALINE-SOLUTION; AC-IMPEDANCE; MODEL; COATINGS; SEM;
Keywords:
ac impedance; electrocatalysis; DSA; iridium dioxide; porous electrode; Transmission Line Model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Bisquert, J Univ Fed Sao Carlos, Dept Quim, POB 676, BR-13560905 Sao Carlos, SP, Brazil Univ Fed Sao Carlos POB 676 Sao Carlos SP Brazil BR-13560905 BC
Citazione:
A.J. Terezo et al., "Separation of transport, charge storage and reaction processes of porous electrocatalytic IrO2 and IrO2/Nb2O5 electrodes", J ELEC CHEM, 508(1-2), 2001, pp. 59-69

Abstract

The small signal ac response of IrO2-based electrodes was investigated using a general impedance model for porous electrodes. This model consists in a distributed equivalent circuit that describes the transport and charge storage of electroactive species coupled with the reaction throughout the internal surface. The evolution of the impedance spectra with the variation inthe dc-applied voltage was predicted, and the measurements obtained showeda very good agreement with the theory. The model allows the evolution of parameters related to transport, charge storage, and reaction, to be followed under widely varying conditions, from the capacitive domain to the regionof heavy current flow by intense surface reaction. The active surface sites play a dominant role both in the capacitive charging process and in the transport component of the impedance. (C) 2001 Elsevier Science BN. All rights reserved.

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Documento generato il 03/04/20 alle ore 02:44:37