Abstract
Electrolytic preparation of V2O5 was studied using VOSO4 as a starting material in acidic solution. Cyclic voltammograms for VOSO4 in the pH range of 1.3 to 2.3 showed a reversible anodic and cathodic peak at about 0.3 to 0.1V vs. Hg/Hg2SO4. Anodic and cathodic peak potentials depended on the pH of the solution. A plot of cathodic peak potentials against pH showed a linear relationship with a slope of 0.171V/pH. This was nearly equal to the theoretical value of 0.1767V/pH at 24°C, corresponding to the electrode reaction, V2O5+6H++2e=2VO2++3H2OThe oxidation products obtained by constant-potential electrolysis at or near peak potential was found by elemental analysis and X-ray diffraction patterns to be amorphous V2O5 giving one broad peak at about 2θ=26°. X-ray diffraction patterns of the oxidation product heated to above 300°C in an air and nitrogen atmosphere agreed with those of V2O5. Inspection by SEM showed that the surface of the product was spongy in structure.
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