Electrocatalytic oxidation of catechol at gold-nanoparticle-modified glassy carbon electrodes

The electrochemical behaviors of catechol at glassy carbon electrodes modified by electrodepositing gold nanoparticles were studied in this paper. The modified electrode was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The resulting electrode showed excellent electrocatalytic activity toward the oxidation of catechol, making oxidation peak potential shife more negatively. The catalytic oxidation current of catechol vs its concentration has a good linear relation in the range of 2.0×10~(-6)～1.2×10~(-2) mol/L with a detection limit of 3.2×10~(-7) mol/L under the optimal operations. Moreover, the studied electrode exhibited high sensitivity and good reproducibility.