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The effects of sulfuric acid concentration, reaction temperature, potential-scanning rate and surfactants on electrochemical behavior of V~(5+) ion on platinum electrodes were investigated. In voltammetric curves of V~(5+) ion there are two reduction peaks corresponding to reductions of V~(5+) to V~(4+) (R2) and V~(5+) to V~(3+) (R1), which are irreversible and quasi-reversible processes respectively. Oxidation peak of V~(3+) to V~(5+) is intensively affected by pH values on the electrode surface and scanning-potential rates. Only stronger acidity on the electrode surface and faster scanning-potential rates can lead to appearance of this oxidation peak. The neutral surfactant(PCBE) and cationic surfactant(CTAB) retard the V~(5+) electroreduction. The anionic surfactant(SDS), even at a very low concentration, increases the currents of both the reduction peaks R1 and R2, and the oxidation peak involves with the oxidation of H_2 to H~+.
The effects of sulfuric acid concentration, reaction temperature, potential-scanning rate and surfactants on electrochemical behavior of V ~ (5+) ion on platinum electrodes were investigated. In voltammetric curves of V ~ (5+) to V ~ (4+) (R2) and V ~ (5+) to V ~ (3+) (R1), which are irreversible and quasi-reversible processes respectively. Oxidation peak of V 3+ to V 5+ is intensively affected by pH values on the electrode surface and scanning-potential rates. Only stronger acidity on the electrode surface and faster scanning-potential rates can lead to appearance of this oxidation peak The anionic surfactant (PCBE) and cationic surfactant (CTAB) retard the V ~ (5+) electroreduction. The anionic surfactant (SDS), even at a very low concentration, increases the currents of both the reduction peaks R1 and R2, and the oxidation peak involves with the oxidation of H_2 to H ~ +.