In this research, we reported a novel modified carbon ceramic electrode using CuI
as modifier was fabricated by sol-gel technique. The electrocatalytic activity of the copper
iodide modified sol-gel derived carbon ceramic (CIM-SGD-CC) electrode was examined for
the oxidation of ascorbic acid (AA). Results showed that the CIM-SGD-CC electrode has
high catalytic ability for electrooxidation of ascorbic acid. The response current exhibited
good linear relationship for the concentration of ascorbic acid in the range from 5×10-4 to
5×10-3 mol L-1, with the correlation coefficient of 0.9902 and the detection limit of 1.66 μmol
L–1. The kinetic parameter such as the electron transfer coefficient (α) and exchange current
density (j0) for the modified electrode were calculated. The advantages of the modified CCE
are its good stability and reproducibility of surface renewal by simple polishing, excellent
catalytic activity and simplicity of preparation
