Electrochemical Oxidation of Mn[sup 2+] on Boron-Doped Diamond Electrodes with Bi[sup 3+] Used as an Electron Transfer Mediator

Electrochemical oxidation of with and without the presence of was studied using voltammetric and in situ spectroelectrochemical techniques at boron-doped diamond (BDD) electrodes in 1.0 M Electrochemical oxidation of only resulted in the formation of mostly with produced as a minor product. The film formed on the electrode surface, which is an inevitable part of oxidation, shows a blocking effect on the formation of and reduces the overall current efficiency of production. Higher concentrations result in less production due to the formation of more The addition of increased the current efficiency of production. The is oxidized to Bi(V), which acts as an electrocatalyst in production. The Bi(V) oxidizes formed on the electrode surface, to This increases the production of by removing the blocking film to provide an active electrode (bare BDD) surface, which is available for further oxidation.