Colloque

Kinetics of the cathodic hydrogen evolution reaction: the distribution of rate determining mechanisms amongst various metals

B. E. Conway

Membre a labase

B. E. Conway

Résumé du colloque

The overall electrolytic hydrogen evolution reaction 2 H3O+ + 2 e -> H2 + 2 H2O can proceed by several possible rate determining steps. Methods for distinguishing these at a given metal under various experimental conditions are discussed and the relationship between exchange currents for the reaction at various groups of metals and the heat of absorption of H at these metals is examined. Metals at which an absorbed H atom is formed in the rate determining step fall in a series where the exchange currents appear to increase with increasing heat of absorption of H at the metal, whereas those metals at which a desorption reaction is rate determining have exchange currents which decrease as the heat of absorption of H increases. This is discussed with regard to the mechanism of rate determining steps and to the d-band character and electronic work function of the metals.

Contexte

Section :

Chimie

Thème du colloque :

Chimie

Responsables :

Ludovic Ouellet C. Berse

Hôte : Université de Montréal

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