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Titolo:
Electrochemical quartz crystal microgravimetry of gold in perchloric and sulfuric acid solutions
Autore:
Jusys, Z; Bruckenstein, S;
Indirizzi:
Inst Chem, LT-2600 Vilnius, Lithuania Inst Chem Vilnius Lithuania LT-2600 nst Chem, LT-2600 Vilnius, Lithuania SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA SUNY Buffalo Buffalo NY USA 14260 ffalo, Dept Chem, Buffalo, NY 14260 USA
Titolo Testata:
ELECTROCHEMICAL AND SOLID STATE LETTERS
fascicolo: 2, volume: 1, anno: 1998,
pagine: 74 - 76
SICI:
1099-0062(199808)1:2<74:EQCMOG>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCANNING-TUNNELING-MICROSCOPY; RING-DISK ELECTRODE; UNDERPOTENTIAL DEPOSITION; SULFATE ADSORPTION; AU(111) ELECTRODE; MICROBALANCE; SPECTROSCOPY; OXIDATION; MONOLAYER; REDUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Jusys, Z Inst Chem, LT-2600 Vilnius, Lithuania Inst Chem Vilnius Lithuania LT-2600 LT-2600 Vilnius, Lithuania
Citazione:
Z. Jusys e S. Bruckenstein, "Electrochemical quartz crystal microgravimetry of gold in perchloric and sulfuric acid solutions", EL SOLID ST, 1(2), 1998, pp. 74-76

Abstract

Formation of oxidized surface films at a gold electrode in sulfuric acid medium during anodization was studied using the electrochemical quartz crystal microbalance (EQCM) technique. The oxidation process consists of two single-electron steps. Forming a surface OH species from adsorbed water is thefirst step. Generating a surface O species from the OH species is the second step. The second step is accompanied by a concerted place exchange reaction involving the surface O species and gold atoms below the surface, and rehydration of the gold surface. The reduction of the surface retraces the oxidation processes. During the faradaic processes, sulfate species are adsorbing on (or desorbing from) the gold surface, but produce no detectible mass change. They have C-3v symmetry on the surface in the relevant potentialregion and compete for five surface gold atoms with five adsorbed water, OH and/or O moieties. In the double-layer region, mass changes are caused bythe adsorption/desorption of sulfate species. Changing frequency-potentialresponses accompany cyclic potential scans because of roughening of the gold electrode's surface caused by sulfate-induced gold dissolution and redeposition processes. (C) 1998 The Electrochemical Society. S1099-0062(98)02-035-5. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 13:39:54