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Titolo:
Weak adsorption of anions on gold: measurement of partial charge transfer using Fast Fourier Transform electrochemical impedance spectroscopy
Autore:
Walters, MJ; Garland, JE; Pettit, CM; Zimmerman, DS; Marr, DR; Roy, D;
Indirizzi:
Clarkson Univ, Dept Phys, Potsdam, NY 13699 USA Clarkson Univ Potsdam NY USA 13699 Univ, Dept Phys, Potsdam, NY 13699 USA
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1, volume: 499, anno: 2001,
pagine: 48 - 60
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGLE-CRYSTAL SURFACES; 2ND-HARMONIC GENERATION; LEAST-SQUARES; POLYCRYSTALLINE GOLD; ERROR STRUCTURE; AC-IMPEDANCE; ELECTRODE; SYSTEMS; VOLTAMMETRY; CAPACITANCE;
Keywords:
Ac impedance; adsorption; Au electrode; capacitance; charge transfer resistance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Roy, D Clarkson Univ, Dept Phys, Potsdam, NY 13699 USA Clarkson Univ Potsdam NY USA 13699 ept Phys, Potsdam, NY 13699 USA
Citazione:
M.J. Walters et al., "Weak adsorption of anions on gold: measurement of partial charge transfer using Fast Fourier Transform electrochemical impedance spectroscopy", J ELEC CHEM, 499(1), 2001, pp. 48-60

Abstract

Using electrochemical impedance spectroscopy (EIS) based on the Fast Fourier Transform (FFT) method, we have investigated the adsorption properties of F-, NO3- and CH3COO- on Au in aqueous electrolytes. The results show thatthese anions adsorb on Au in considerably small amounts. The adsorption reactions are associated with partial charge transfer across the interface. We present a theoretical framework to analyze these data. Certain previouslyreported impedance features of simple adsorption reactions are found as special cases of the present analysis. By combining theory and experiment, wedetermine the double layer capacitance, adsorption capacitance, and the amount of partial charge transfer as functions of the applied voltage. The theoretical framework of the present work can be applied to both cases of weak and strong adsorption, and can be extended to describe coadsorption of different anions. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 08/07/20 alle ore 07:41:05