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Titolo:
ELECTROCATALYTIC REDUCTION OF PEROXODISULFATE ANION ON AU(111) IN ACIDIC AQUEOUS-SOLUTIONS
Autore:
SAMEC Z; BITTNER AM; DOBLHOFER K;
Indirizzi:
MAX PLANCK GESELL,FRITZ HABER INST,FARADAYWEG 4-6 D-14195 BERLIN GERMANY INST CHEM PHYS PRAGUE 18224 8 CZECH REPUBLIC
Titolo Testata:
Journal of electroanalytical chemistry [1992]
fascicolo: 1-2, volume: 409, anno: 1996,
pagine: 165 - 173
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCANNING-TUNNELING-MICROSCOPY; SINGLE-CRYSTAL PLANES; ELECTROCHEMICAL OXIDATION; ELEMENTARY STEPS; ELECTRODE; SURFACES; RECONSTRUCTION; SPECTROSCOPY; ADSORPTION; GOLD(111);
Keywords:
ELECTROCATALYSIS; PEROXODISULFATE REDUCTION; AU(111) ELECTRODE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
Z. Samec et al., "ELECTROCATALYTIC REDUCTION OF PEROXODISULFATE ANION ON AU(111) IN ACIDIC AQUEOUS-SOLUTIONS", Journal of electroanalytical chemistry [1992], 409(1-2), 1996, pp. 165-173

Abstract

Cyclic and rotating disc electrode voltammetry were used to examine the electrochemical reduction of peroxodisulfate at an Au(111) electrode in acidic aqueous solutions. As for a polycrystalline gold electrode, two well-distinguished parallel pathways were observed, i.e. an electrocatalytic reduction prevailing at more positive potentials, and a direct reduction of the solution species at more negative potentials. However, the rate of the former pathway at Au(111) is about two orders of magnitude higher than at Au(poly). This enhancement is likely to belinked to an increased adsorption and/or the rate of the electron transfer to adsorbed species due to a better matching of the anion structure with the trigonal structure of the Au(111) surface. Two novel features were revealed, namely the catalytic effect of protons, and the inhibition of the reduction by other adsorbable species, e.g. the perchlorate anion. Both effects can be treated within the framework of a simple electrocatalytic kinetic model. In contrast, the direct reduction at Au(111) proceeds with approximately the same rate as at Au(poly). The rate of this pathway depends strongly on the factors that influencethe ion distribution on the solution side of the interface, such as the excess charge on the metal or the specific ion adsorption and its hysteresis with respect to the electrode potential.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 16:28:47