Comparative Evaluation of Dimethylsulfoxide and Dimethylsulfone Adsorption on a Smooth Platinum Electrode in Acidic Environment


a comparative assessment of dimethylsulfoxide and dimethylsulfone adsorption on a smooth platinum electrode in acidic medium in the region of anode potentials is presented. The adsorption isotherms in the “hydrogen” potential range, depending on the dimethylsulfoxide and dimethylsulfone concentration, are S-shaped. At the adsorbate concentrations in the solution exceeding 0.1 M, the surface coverage with dimethylsulfoxide and dimethylsulfone is nearly the same and changes but slightly. A significant difference in the adsorption characteristics of dimethylsulfoxide and dimethylsulfone in the potential region of oxygen adsorption is found. According to the Pt-electrode surface coverage with oxygen in the presence of the test substances, it was concluded that the value of the dimethylsulfoxide and dimethylsulfone adsorption is maximal only when their bulk concentration is higher than 0.1 M, here the oxygen surface coverage in the presence of dimethylsulfone exceeds that in the background solution.

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This study is carried out using high-technology equipment of the Centers for Collective Use, the Dagestan Federal Research Center RAS and Dagestan State University.


This work is financially supported by the Innovation Foundation, the Programs UMNIK-14-1G 3326GU1/2014 (code 0003751) and UMNIK 2-15-10 № 8809GU2/2015 (code 0016996).

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Akhmedov M.A., Ibragimova K.O. and Khidirov Sh. invented and developed an experiment, participated in writing the text of the article. The author Akhmedov M.A. assembled an experimental setup with a three-electrode cell with a reversible hydrogen reference electrode and conducted an electrochemical study of dimethyl sulfone on a smooth platinum electrode in an acidic medium, and obtained, isolated, purified, and prepared samples of compounds for preparative electrochemical analysis of dimethyl sulfone for their physicochemical analysis. The author Ibragimova K.O. also conducted an electrochemical study and preparative electrolysis of dimethyl sulfoxide on a smooth platinum electrode in an acidic medium, and also processed experimental data to study the adsorption of dimethyl sulfoxide on smooth platinum. The author Akhmedov conducted research using Raman spectroscopy, scanning microscopy, energy dispersive and X-ray analysis, and also processed experimental data on the adsorption of dimethyl sulfone on a smooth platinum electrode in an acidic medium, participated in the writing of the text of the article and prepared all the graphic drawings related to the manuscript of the article . All authors participated in the discussion of the results.

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Correspondence to M. A. Akhmedov or Sh. Sh. Khidirov.

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Translated by Yu. Pleskov

Published on the basis of materials of the XIX All-Russian Conference “Electrochemistry of Organic Compounds” (EKHOS-2018) (with international participation), Novocherkassk, 2018.

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Akhmedov, M.A., Ibragimova, K.O. & Khidirov, S.S. Comparative Evaluation of Dimethylsulfoxide and Dimethylsulfone Adsorption on a Smooth Platinum Electrode in Acidic Environment. Russ J Electrochem 56, 396–404 (2020).

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  • adsorption
  • smooth platinum
  • voltammetry
  • dimethylsulfoxide
  • dimethylsulfone
  • surface coverage
  • electrode processes
  • molecular spectroscopy