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Titolo:
A multi-technique study of compact and hydrous Au oxide growth in 0.1 M sulfuric acid solutions
Autore:
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: 1-2, volume: 500, anno: 2001,
pagine: 562 - 573
Fonte:
ISI
Lingua:
ENG
Soggetto:
POTENTIAL CYCLING CONDITIONS; SURFACE INTERMEDIATE STATES; SINGLE-CRYSTAL PLANES; GOLD ELECTRODES; ELECTROCHEMICAL OXIDATION; PLATINUM-ELECTRODE; ELEMENTARY STEPS; FILMS; REDUCTION; BEHAVIOR;
Keywords:
Au oxide films; hydrous oxide; compact oxide; ellipsometry; hydration; quartz crystal microbalance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Birss, VI Univ Calgary, Dept Chem, 2500 Univ Dr, Calgary, AB T2N 1N4, Canada Univ Calgary 2500 Univ Dr Calgary AB Canada T2N 1N4 1N4, Canada
Citazione:
S.J. Xia e V.I. Birss, "A multi-technique study of compact and hydrous Au oxide growth in 0.1 M sulfuric acid solutions", J ELEC CHEM, 500(1-2), 2001, pp. 562-573

Abstract

The growth and reduction of compact (alpha-) and overlying hydrous (beta-)oxide films on polycrystalline Au electrodes in aqueous 0.1 M H2SO4 solutions have been investigated using potentiostatic, cyclic voltammetry, ellipsometric and quartz crystal microbalance (QCMB) techniques. All alpha -oxidefilms, formed with time at constant potentials up to 2.6 V, or by multicycling of the potential, are non-hydrated in nature, even when covered by a thick beta -oxide film. The alpha -oxide him composition is suggested to be AuO below 1.5 V, and a mixture of AuO + Au2O3 at potentials above this, becoming predominantly Au2O3 at very high potentials. Up to three monolayers of Au2O3 can be formed. When formed at constant potential, the beta -oxide film becomes increasingly hydrated as it thickens with time of growth, with a mass to charge ratio and refractive index consistent with Au2O3.H2O and later with Au2O3. 2H(2)O. In contrast, the beta -oxide film formed by multicycling has a higher mass overall, and becomes less hydrated as it thickens with time, with a mass and refractive index consistent with Au2O3. 10H(2)O at short times, ranging to Au2O3. 2H(2)O as the film thickens. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 14/08/20 alle ore 17:08:15