Voltammetric behaviour of platinum in aqueous solutions containing sodium hypophosphite |
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Authors: | J. J. Podestá R. C. V. Piatti A. J. Arvia |
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Affiliation: | (1) Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina |
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Abstract: | The anodic and cathodic behaviour of polycrystalline Pt in sodium hypophosphite solutions has been investigated by cyclic voltammetry. In acid solutions the voltammograms show that, owing to the presence of the reducing agent, electrooxidation of species related to H3PO3 occurs in the potential range 0.6 to 1.4 V with respect to NHE. In alkaline solutins the presence of NaH2PO2 partially inhibits the HER and displaces the formation of the oxygen monolayer on platinum to higher potentials. The voltammetric peaks are attributed to the electrooxidation of the products resulting from the chemical decomposition of NaH2PO2 in contact with the Pt surface. |
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