Electrochemiluminescence in the S2O82- system: Pt–Cd electrodes

The electrochemiluminescence (ECL) in the S2O82- system occurs under conventional cyclic voltammetry, when the Pt working electrode was coated with Cd elementary substance. The ECL mechanism was proposed, due to the reaction between the strongly oxidizing intermediate SO4- and the transitory production, CdO, generated by oxidation of Cd with SO4-. Moreover the ECL behavior was studied in different pHs and concentrations of S2O82-solution. It was showed that the ECL signal was strongest at pH 8.0, and its intensity increased with S2O82-. The experimental results verified well with the proposed ECL mechanism.