采用循环伏安法和线性扫描法研究了硫酸和甲磺酸介质中Ce³⁺/Ce⁴⁺在Pt旋转圆盘电极（RDE）上的电化学性能，初步探索了Ce³⁺/Ce⁴⁺的络合行为，考察了Ce³⁺反应的交换电流密度、扩散系数以及反应速率常数，比较了两种酸介质中Ce³⁺在Pt电极氧化的活化能. 结果表明，硫酸介质中以Ce⁴⁺的络合为主，其平衡电位负移；甲磺酸介质中以Ce³⁺的络合为主，其平衡电位正移. 硫酸介质中Pt电极上Ce³⁺更容易氧化为Ce⁴⁺, 硫酸铈(III)的电氧化对温度更为敏感.

The electrochemical oxidations of Ce³⁺ to Ce⁴⁺ on Pt rotating disk electrode (RDE) in both sulfuric acid and methanesulfonic acid (MSA) solutions were studied by using cyclic voltammetry and linear sweep voltammetry. The complexing behaviors of Ce³⁺/Ce⁴⁺ were preliminarily probed and the exchange current density, diffusion coefficient, as well as reaction rate constant were obtained from Butler-Volmer equation. The activation energies of Ce³⁺ oxidation on Pt electrode in two types of acidic media, obtained from Arrhenius equation, were also compared. The results indicate that Ce³⁺ can be oxidized to Ce4+ much easier in sulfuric acid than in MSA solutions. The equilibrium potential in sulfuric acid solutions moves negatively due to the predominant complexation of Ce⁴⁺, while that in MSA solutions positively because of the predominant complexation of Ce³⁺, The larger values of activation energy for the oxidation of Ce³⁺ to Ce⁴⁺ on Pt electrode in sulfuric acid solutions suggest that the oxidation of Ce³⁺ occurs more readily and the electro-oxidation of cerous sulfate is more susceptible to temperature.