关键词: 偶氮腺嘌呤；表面吸附量；循环伏安法；金电极, 电极动力学

Abstract: In this paper, we studied the electrochemical behaviors of azopurine on polished gold electrodes with cyclic voltammetry (CV). On the basis of analyzing scan rate and peak current, it was supposed that the redox process belonged to a reversible process controlled by adsorption in 0.2 mol·L^-1 PBS (pH = 4.0 ~ 10.0) solutions. The potentials of redox peaks moved more negatively with increasing pH value. This proved that the H⁺ proton has participcted in the electrochemical reaction. The further data analysis and the calculation of surface adsorption excess demonstrated that the reaction was a two-proton and two-electron process. Finally, the apparent transfer coefficient α and the apparent rate constant ks were determined by the fast-scan cyclic voltammetry method.

Key words: azopuine, surface adsorption excess, cyclic voltammetry, gold electrode, electrode kinetics