Abstract: Glassy carbon electrode modified by cellulose-acetate-covered Prussian blue was fabricated as a novel hydrogen peroxide sensor. The modified electrode showed an excellent electrocatalytic activity for H2O2 reduction in neutral solutions. H2O2 was thus detected amperometrically in pH 70 phosphate buffer solutions at an applied potential of -0.2 V (vs SCE). The response current was proportional to the concentration of H2O2 in the range of 1.0×10-5~2.5×10-4 mol/L with the detection limit of 22×10-6 mol/L at a signal to noise ratio of 3, RSD=0999 4. The sensitivity was estimated to be 190 mA·L·cm-2·mol-1. In addition, the modified electrode exhibited an excellent operational stability.

Key words: hydrogen peroxide, Prussian blue, GCE, cellulose acetate