Current transients for the hydrogen evolution reaction at high overpotentials on silver electrodes in acid solutions: Experiments and modelling

The hydrogen evolution reaction has been investigated on Ag(100) by potentiostatic current transients at high overpotentials (η>0.7V) in acidic solutions. The reaction proceeds via the Volmer–Heyrovsky mechanism, simultaneously coupled with desorption of sulphate/disulphate anions. Volmer is the...

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Published inElectrochimica acta Vol. 109; pp. 403 - 410
Main Authors Ruderman, A., Juarez, M.F., Soldano, G., Avalle, L.B., Beltramo, G., Giesen, M., Santos, E.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 30.10.2013
Subjects
Anions
Catalysis
Desorption
Electrodes
Heyrovsky
Hydrogen
Hydrogen evolution
Joining
Mathematical models
Silver
Sulfates
Volmer
Volmer
Silver
Anions
Hydrogen
Heyrovsky
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Summary:The hydrogen evolution reaction has been investigated on Ag(100) by potentiostatic current transients at high overpotentials (η>0.7V) in acidic solutions. The reaction proceeds via the Volmer–Heyrovsky mechanism, simultaneously coupled with desorption of sulphate/disulphate anions. Volmer is the rate determined step, although the Heyrovsky reaction is only slightly faster. The kinetic parameters have been obtained under various conditions of pH and concentration of anions. A catalytic effect due to the presence of anions has been observed.
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ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2013.07.112