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Titolo:
IMPEDANCE STUDIES OF RECONSTRUCTED AND NON-RECONSTRUCTED GOLD SINGLE-CRYSTAL SURFACES
Autore:
EBERHARDT D; SANTOS E; SCHMICKLER W;
Indirizzi:
UNIV ULM,ABT ELEKTROCHEM D-89069 ULM GERMANY UNIV ULM,ABT ELEKTROCHEM D-89069 ULM GERMANY
Titolo Testata:
Journal of electroanalytical chemistry [1992]
fascicolo: 1, volume: 419, anno: 1996,
pagine: 23 - 31
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCANNING-TUNNELING-MICROSCOPY; 2ND HARMONIC-GENERATION; FLAME-ANNEALED AU(100); AQUEOUS-SOLUTION; DOUBLE-LAYER; ZERO CHARGE; ELECTRODE SURFACES; AU(111) ELECTRODE; ADSORPTION; SILVER;
Keywords:
IMPEDANCE SPECTROSCOPY; GOLD; SINGLE-CRYSTAL SURFACES; ANION ADSORPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
D. Eberhardt et al., "IMPEDANCE STUDIES OF RECONSTRUCTED AND NON-RECONSTRUCTED GOLD SINGLE-CRYSTAL SURFACES", Journal of electroanalytical chemistry [1992], 419(1), 1996, pp. 23-31

Abstract

The (100), (111) and (210) surfaces of single crystal gold electrodeswere investigated by impedance spectroscopy over the frequency range from I Hz to 10 kHz. In solutions containing weakly adsorbed anions, such as ClO4-, F- and PF6-, the data could be fitted to a simple equivalent circuit consisting of the double layer capacitance and the electrolyte resistance connected in series. Probably, the adsorption of these anions is so fast that it cannot be detected in the frequency range employed. In contrast, the anions Cl- and Br- adsorb more strongly andwith a measurable rate; in this case an adsorption branch had to be added to the equivalent circuit. On Au(100) and Au(III) the well-known reconstruction phenomena were observed. Both the potentials at which they occur and the rate depend on the type and the concentration of theanion. The double layer capacity was measured on the reconstructed and on the ideal surfaces, and for a series of concentrations. In all cases considered, Parsons-Zobel plots are linear, but the slopes are much smaller than unity.

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Documento generato il 29/03/20 alle ore 11:11:07