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Titolo:
Electrochemical investigation of 1,5-pentanediol adsorption on the Ag(111)and Ag(110) faces
Autore:
Foresti, ML; Innocenti, M; Guidelli, R; Hamelin, A;
Indirizzi:
Univ Florence, Dipartimento Chim, I-50121 Florence, Italy Univ Florence Florence Italy I-50121 mento Chim, I-50121 Florence, Italy CNRS, Electrochim Interfaciale Lab, F-92195 Meudon, France CNRS Meudon France F-92195 chim Interfaciale Lab, F-92195 Meudon, France
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 467, anno: 1999,
pagine: 217 - 229
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRYSTAL-PLANE ELECTRODES; INTERFACIAL-TENSION MEASUREMENTS; ELECTROSORPTION VALENCY GAMMA; MERCURY WATER INTERFACE; DIFFERENTIAL CAPACITY; ALIPHATIC-ALCOHOLS; DOUBLE-LAYER; N-HEXANOL; BISMUTH; BEHAVIOR;
Keywords:
electrosorption; 1,5-pentanediol; chronocoulometry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Guidelli, R Univ Florence, Dipartimento Chim, Via G Capponi 9, I-50121 Florence, Italy Univ Florence Via G Capponi 9 Florence Italy I-50121 e, Italy
Citazione:
M.L. Foresti et al., "Electrochemical investigation of 1,5-pentanediol adsorption on the Ag(111)and Ag(110) faces", J ELEC CHEM, 467(1-2), 1999, pp. 217-229

Abstract

The electrosorption of 1,5-pentanediol (PD) on a Ag(111) single-crystal electrode surface was investigated from aqueous 0.05 M KClO4 on the basis of chronocoulometric measurements of the capacitive charge sigma(M) and of differential capacity measurements. The sluggishness of the PD adsorption/desorption step prevented differential capacity measurements under conditions of adsorption equilibrium, other than in the neighbourhood of the potential of maximum adsorption. Chronocoulometric measurements do not suffer from this limitation. Adsorption isotherms at constant potential E and at constantsigma(M) were therefore determined on the basis of a thermodynamic analysis of chronocoulometric sigma(M) versus E plots at different PD concentrations. The potential dependence of the electrosorption valency was found to bedetermined mainly by the reorientation of the water dipoles under the interfacial electric field. The adsorption isotherm at the potential of maximumadsorption. E-m, obtained by the thermodynamic procedure, was compared with that obtained from differential capacity data via an extra-thermodynamic procedure based on the Frumkin two-parallel capacitors model. The latter procedure was also adopted to estimate the adsorption isotherm of PD on Ag(110) at the potential of maximum adsorption. The absolute value of the standard Gibbs energy of adsorption at E-m decreases in passing from Ag(111) to Ag(110), namely with an increase in the hydrophilicity of the face. (C) 1999Elsevier Science S.A. All rights reserved.

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Documento generato il 02/04/20 alle ore 12:18:48