摘要
The effects of sulfuric acid concentration, reaction temperature, potential-scanning rate and surfactants on electrochemical behavior of V5+ ion on platinum electrodes were investigated. In voltammetric curves of V5+ ion there are two reduction peaks corresponding to reductions of V5+ to V4+ （R2） and V5+ to V3+ （R1）, which are irreversible and quasi-reversible processes respectively. Oxidation peak of V3+ to V5+ 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 V5+ 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 H2 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+) 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^+.
出处
《中国有色金属学会会刊：英文版》
CSCD
2003年第6期1465-1471,共7页
Transactions of Nonferrous Metals Society of China
基金
Project(B3 9910 )supportedbytheResearchFoundationoftheEducationDepartmentofHunanProvince,China
