Abstract: A sensor for determination of hydrogen peroxide（H2O2） based on 4-(2-pyridylazo)-resorcinol(PAR) polymer film modified glassy carbon electrodes(GCE) was fabricated . Electrochemical properties and characteristics of the PAR polymer film modified electrode for H2O2 reduction were investigated using cyclic voltammetry and chronoamperometry methods. The results showed that the modified electrode exhibited good electrocatalytic activity towards the reduction of H2O2 at a low potential. The chronoamperometric detection of H2O2 was carried out at -0.45 V in 0.1 mol/L phosphate buffered solution(pH=8.0). The peak currents of H2O2 reduction varied linearly with the concentration in the range of 2×10-5～1.76×10-3 mol/L, with a linearly dependent coefficient r=-0.99983, the detection limit(S/N=3) was 3 μmol/L. The modified electrode showed high sensitivity, good stability, easy preparation and exhibited better anti-interference to ascorbic acid, uric acid and glucose.

Key words: (pyridylazo)-resorcinol, hydrogen peroxide, cyclic voltammetry, chronoamperometry