Abstract:

Poly(para-hydroxybenzoic acid) (poly-PHB) modified glassy carbon electrode was prepared by cyclic voltammetry. The electrocatalytic activity of ascorbic acid(AA) was explored at the poly-PHB GCE. The results showed a good electrocatalytic ability for AA and current increased on the film modified GCE. The peak potential was shift negatively from 0. 2383 V to 0.0496 V. A linear relationship existed between the catalytic current and the AA concentration in the range of 2.6 ×10-5 to 3.68 ×10-4 mol/L with a correlation coefficient of 0.9984 (n = 11). The detection limit (S/N = 3) was 5×10- 6 mol/L. The poly-PHB GCE exhibited an effective and fast catalytic response to the oxidation of AA with good reproducibility and stability.

Key words: para-hydroxybenzoic acid, ascorbic acid, electrocatalysis, voltammetry