溴离子在PbO2电极上电氧化的研究

通过溴离子在PbO2电极上阳极极化曲线及电流效率的测定,探讨了溴离子氧化的反应机理和电解条件.研究发现,溴离子的电氧化为一级反应;在电极电势1.16～1.26V范围内,其表观活化能为8.53～8.81kJ/mol.在pH=2.0～10.2范围内,溴离子在PbO2电极上氧化的电流效率变化较小,但电流效率随温度的升高略有下降,随溴离子浓度的升高电流效率先升高,达到一定浓度后趋于不变.

Electrooxidation of Bromide Anion at a PbO2 Electrode

By determination of the polarization curves and the current efficiency, the electrolytic conditions and the reaction mechanism of the anodic oxidation of Br- at a PbO2 electrode were explored. It is indicated that the electrooxidation of Br- is a first order reaction and the apparent activation energy is 8.53—8.81 kJ/mol in the potential range of 1.16—1.26 V. The current efficiency of Br- oxidation at a PbO2 electrode does not change basically with the change of pH values in the pH range of 2.0—10.2, decreases slightly with increasing temperature, and increases with increasing the concentration of bromide anion, but when the concentration of bromide anion increases up to a certain extent, the current efficiency keeps fixed.