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The hydrogen pressure equivalent to the overpotential: observation on Pd hydrogen electrode and interpretation on the basis of a mixed-controlled mechanism

✍ Scribed by M. Enyo

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
716 KB
Volume
39
Category
Article
ISSN
0013-4686

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✦ Synopsis

A quantitative analysis is presented of the hydrogen pressure that is in equilibrium with adsorbed hydrogen at a Pd cathode and discussed on the basis of a mixed-controlled Volmer-Tafel mechanism of the hydrogen electrode reaction. Experimental evidence which supports this, but not the Volmer-Heyrovsky mechanism on a smooth Pd electrode, are discussed. The effective pressure can be evaluated from the slowly decaying overpotential component appearing in overpotential decay transients.

Evidence is given which indicates that the overpotential component is indeed caused by adsorbed hydrogen on the electrode surface. The effects of some catalytic poisons, which augment the equivalent pressure under otherwise the same conditions, are investigated.

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## Ahabnet -Electrochemical aspects of the hydrogen embrittlement are discussed in terms of a possible mechanism change of the hydrogen-electrode reaction occurring at the surface of the metal. Hydrogen pressure equivalent to hydrogen over-potential is formulated for the dischargmmbination and the