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Titolo:
Experimental study and modeling of impedance of the her on porous Ni electrodes
Autore:
Hitz, C; Lasia, A;
Indirizzi:
Univ Sherbrooke, Dept Chim, Sherbrooke, PQ J1K 2R1, Canada Univ Sherbrooke Sherbrooke PQ Canada J1K 2R1 erbrooke, PQ J1K 2R1, Canada
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 500, anno: 2001,
pagine: 213 - 222
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROGEN EVOLUTION REACTION; NICKEL ELECTRODES; POWDER ELECTRODES; ALLOY ELECTRODES; KINETICS;
Keywords:
impedance; porous electrodes; hydrogen evolution; digital simulations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Lasia, A Univ Sherbrooke, Dept Chim, Sherbrooke, PQ J1K 2R1, Canada Univ Sherbrooke Sherbrooke PQ Canada J1K 2R1 PQ J1K 2R1, Canada
Citazione:
C. Hitz e A. Lasia, "Experimental study and modeling of impedance of the her on porous Ni electrodes", J ELEC CHEM, 500(1-2), 2001, pp. 213-222

Abstract

The electrochemical activity towards the hydrogen evolution reaction of pressed powder electrodes (Ni-Zn and Ni-Al) was studied in alkaline solutionsafter leaching out the more active element. These electrodes displayed porous character, and electrochemical impedance spectroscopy was used to characterize surface porosity. The influence of overpotential, temperature, poisons, electrode composition and electrolyte concentration was studied and distinction criteria between faradaic and geometrical effects were formulated. Digital simulations of impedance values in different pore geometries werealso carried out. The kinetic parameters of hydrogen evolution were determined. The main factor influencing the electrode activity seems to be the real surface area. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 19:15:12