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Anodic oxidation mechanism of hypophosphorous and phosphorous acid on palladium

1966; Elsevier BV; Volume: 12; Issue: 3 Linguagem: Inglês

10.1016/0022-0728(66)80045-1

2590-2946

S. Trasatti, Annalisa Alberti,

Electrochemical Analysis and Applications

The mechanism of anodic oxidation of hypophosphorous and phosphorous acid on palladium has been studied. Both acids undergo a catalytic dehydrogenation followed by the ionization of the resulting atomic hydrogen. This process is characterized by a limiting value of the polarizing current. Reaction order and activation energy have been determined for the rate-determining steps. The experimental data suggest that the rate-determining step is the electrochemical hydrogen ionization in the anodic oxidation of hypophosphorous acid and the catalytic dehydrogenation, H3PO3→H2PO3 + H, for phosphorous acid. Suggestions are made for the anodic deactivation of the palladium electrode in the hypophosphorous acid anodic oxidation.