Galvanostatic desorption of hydrogen from Pd layers—III. The anodic volmer reaction

✍ Scribed by R.V. Bucur; Felicia Bota

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 481 KB
• Volume: 28
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(83)85191-3

✦ Synopsis

The anodic Volmer reaction on equilibrated a-(Pd-H) electrodes has been studied using the galvanostatic technique within the anodic current range of 0. J-20 mA. The influence of the concentration of electrolyte solution (H2S0, and Na2S04 solutions), surface structureand temperatureon theanodic transfer coefficient, cz and the formal rate constant, /3kz have been reported. Generally a-values diminish, while ,Ykzvalues increase with the anodic current density. This effect is stronger in so far as the electrode surface is more activated by electrodeposition of Pd-black. The apparent activation energy of the overall oxidation reaction depends on the surface structure: it is high on an unactivated surface (-11 kcal/g-atom H), and practically negligible on an activated surface. This is interpreted on the basis of complex structure of surface region on a (W-H) electrode.