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Titre du document / Document title

The electrochemical formation and reduction of a thick AgCl deposition layer on a silver substrate

Auteur(s) / Author(s)

XIANBO JIN (1) ; JUNTAO LU (1) ; PEIFANG LIU (1) ; HUA TONG (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Chemistry, Wuhan University, Wuhan 430072, CHINE

Résumé / Abstract

Systematic electrochemical studies and scanning electron microscopy (SEM) observations were carried out on the anodic formation and cathodic reduction of dense AgCl (about 20 μm thick) on a planar silver substrate in 0.1 mol dm-3 HCl at room temperature. Special attention was given to the ionic conductivity of the AgCl deposit layer. In the major period of anodic growth of AgCl, partially solvated Ag ions in inter-grain microchannels were thought to be the main charge carrier. A model featuring periodical changes in the accessibility of microchannels to electrolyte solution was proposed to explain various phenomena, including overpotential fluctuation and complex changes of surface morphology. The initial stage of AgCl reduction was thought to be essentially the reverse process of AgCl growth. But the microchannels were soon broadened so that the electrolyte solution in channels became the main support of ionic conduction. The porous silver layer resulting from reduction of the dense AgCl had a porosity of 60%, which was determined by the difference in molar volume between AgCl and Ag. The average diameter d (μm) of Ag particles and the current density j (mA cm -2) of reduction were found to follow approximately a linear equation in the j range studied (0.2-3.2 mA cm-2): d = 0.19 -0.24 logj.

Revue / Journal Title

Journal of electroanalytical chemistry    ISSN  1572-6657 

Source / Source

2003, vol. 542, pp. 85-96 [12 page(s) (article)] (22 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1992) (Revue)

Mots-clés anglais / English Keywords

Transition metal Compounds

;

Energy dispersion

;

Dispersive spectrometry

;

X ray spectrometry

;

Particle size

;

Ionic conduction

;

Kinetic control

;

Hydrochloric acid

;

Aqueous solution

;

Silver

;

Sheet electrode

;

Porous electrode

;

Silver chloride

;

Chemical reduction

;

Electrode reaction

;

Electrochemical reaction

;

Experimental study

;

Mots-clés français / French Keywords

Métal transition Composé

;

Dispersion énergie

;

Spectrométrie dispersive

;

Spectrométrie RX

;

Dimension particule

;

Conduction ionique

;

Contrôle cinétique

;

Chlorhydrique acide

;

Solution aqueuse

;

Argent

;

Electrode feuillard

;

Electrode poreuse

;

Argent chlorure

;

Réduction chimique

;

Réaction électrode

;

Réaction électrochimique

;

Etude expérimentale

;

Mots-clés espagnols / Spanish Keywords

Metal transición Compuesto

;

Dispersión energía

;

Espectrometría dispersiva

;

Espectrometría RX

;

Dimensión partícula

;

Conducción iónica

;

Control cinético

;

Ácido chlorhídrico

;

Solución acuosa

;

Plata

;

Electrodo lámina

;

Electrodo poroso

;

Plata cloruro

;

Reducción química

;

Reacción electrodo

;

Reacción electroquímica

;

Estudio experimental

;

Mots-clés d'auteur / Author Keywords

Silver chloride

;

Silver

;

Porous electrodes

;

Ionic conduction

;

Particle size

;

Localisation / Location

INIST-CNRS, Cote INIST : 1150, 35400010750447.0110

Nº notice refdoc (ud4) : 14484003



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