Journal of Applied Electrochemistry

, Volume 33, Issue 3, pp 319-323

First online:

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

  • V. DevadossAffiliated withCentral Electrochemical Research Institute
  • , M. NoelAffiliated withCentral Electrochemical Research Institute
  • , K. JayaramanAffiliated withCentral Electrochemical Research Institute
  • , C. Ahmed BashaAffiliated withCentral Electrochemical Research Institute

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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/ceric cobaltous/cobaltic cyclic voltammetry manganous/manganic methane sulfonic acid