亚硫酸根在化学修饰电极上催化氧化的动力学表征

本文采用Saveant-Andrieux电催化反应动力学理论,表征了SO₃^2-在经Nation-Os(bpy)₃^2+/3+修饰后的玻碳电极上的电催化体系的动力学行为,用动力学区域图确定体系的动力学类型.当反应物浓度从8×10^-5变至1.28×10^-3(mol/L)时,体系始终遵循"SR"的动力学行为。

Kinetic Characterization of Electrocatalytic Oxidation of Sulfite at Chemically Modified Electrodes

The oxidation of sulfite at glassy carbon electrodes is sluggish, but the reaction can be catalyzed by Nafion-Os(bpy)₃^2+/3+modified electrode. Saveant-Andrieux theory is used as the diagnostic tool to characterize the dynamics of the catalysis. The substrate concentration and the rotation rate of electrodes are varied systematically in order to evaluate four characteristic currents quantitatively. The kinetic zone diagram is used to assign the kinetic type of the system. As the concentration of the reac-tant varies form 8× 10^-5to 1. 28 ×10^-3(mol/L), the "SR" dynamic behavior remains. An experimental verification for the theoretical model is also provided.