苯在铂电极上的电化学行为

Electrochemical Behavior of Benzene on Platinum Electrode

用循环伏安法 ,在 1 mol/L硫酸水溶液和含 1 0 - 3mol/L苯的 1 mol/L硫酸水溶液中对铂电极行为进行了测试 ;分析了电极过程中产生的氧、氢和苯及其氧化产物在电极表面的吸附特征以及苯的电极反应的可逆性和氧化步骤 ;提出了在酸性介质中 ,阳极过程苯发生化学吸附 ,阴极过程发生物理吸附 ,氧化反应步骤是不可逆电化学活化为控制步 。

The behavior of platinum electrode were studied by cyclic voltammetry in 1mol/L sulfuric acid solution and 1mol/L sulfuric acid solution containing 10 -3 mol /L benzene. The absorption characters for oxygen, hydrogen, and benzene and the oxidation products on electrode surface have been discussed. The reactive reversibility and oxidation of benzene on electrode process have been investigated. In acid solutions, benzene is absorbed chemically on anode, while physical adsorption occurs on cathode. The control step is irreversible electrochemical activation for oxidation process and subsequent steps are faster. It is suggested that the reaction follows an EC mechanism.