Journal of Applied Electrochemistry

, Volume 33, Issue 3, pp 319–323

Electrochemical behaviour of Mn3+/Mn2+, Co3+/Co2+ and Ce4+/Ce4+ redox mediators in methanesulfonic acid


  • V. Devadoss
    • Central Electrochemical Research Institute
  • M. Noel
    • Central Electrochemical Research Institute
  • K. Jayaraman
    • Central Electrochemical Research Institute
  • C. Ahmed Basha
    • Central Electrochemical Research Institute

DOI: 10.1023/A:1024136500644

Cite this article as:
Devadoss, V., Noel, M., Jayaraman, K. et al. Journal of Applied Electrochemistry (2003) 33: 319. doi:10.1023/A:1024136500644


The redox behaviour of Mn3+/Mn2+, Co3+/Co2+ and Ce4+/Ce3+ mediators commonly used in indirect oxidation of organic compounds were evaluated in methane sulfonic acid on a glassy carbon working electrode employing cyclic voltammetry. Manganic methanesulfonate exhibits higher instability in dilute methanesulfonic acid. The solid MnO2 formed during disproportionation on the glassy carbon electrode further affects the reproducibility. Cobaltic methanesulfonate formation occurs only at oxygen evolution region rendering the overall oxidation process less efficient. Ceric methane sulfonate formation is highly efficient over a wide acid concentration range. Ceric methanesulfonate can also be employed over a wide temperature range to oxidize different aromatic compounds.

cerous/cericcobaltous/cobalticcyclic voltammetrymanganous/manganicmethane sulfonic acid

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© Kluwer Academic Publishers 2003