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Electrooxidation of phenol at exfoliated graphite electrode in alkaline solution

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Abstract

The present paper reports on exfoliated graphite (EG) used for the cyclic electrochemical process of phenol oxidation in alkaline solution. It is shown that the electrochemical activity of anode-produced EG decreases considerably in the second cycle due to the deposition of an oligomer film, composed of the products of phenol oxidation, on the EG surface. Thermal treatment of the inactive graphite anode in air at 500 °C provided a regenerated material of activity three times higher for the first cycle and 2.6 times higher for three cycles as compared to the original anode. The reason for such a behavior is assigned to a carbon film formed on the EG surface during the carbonization/oxidation processes involving the products of phenol oxidation. Comparative studies showed that electroactivity of the original EG can also be enhanced if before the process of phenol oxidation the original EG is activated by heat treatment. Unfortunately, the electrochemical activity of the product of such a treatment is higher only for the first cycle of phenol oxidation and drops dramatically in the following cycles.

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Acknowledgements

This work was financially supported from the grant TB 31-048/03 DS.

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Authors and Affiliations

  1. Institute of Chemistry and Technical Electrochemistry, Poznań University of Technology, ul. Piotrowo 3, 60-965, Poznań, Poland

    J. M. Skowroński & P. Krawczyk

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  1. J. M. Skowroński
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  2. P. Krawczyk
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Correspondence to J. M. Skowroński.

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Dedicated to the memory of Harry B. Mark, Jr. (28 February 1934–3 March 2003)

Contribution to the 3rd Baltic Conference on Electrochemistry, Gdańsk-Sobieszewo, 23–26 April 2003.

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Skowroński, J.M., Krawczyk, P. Electrooxidation of phenol at exfoliated graphite electrode in alkaline solution. J Solid State Electrochem 8, 442–447 (2004). https://doi.org/10.1007/s10008-003-0483-8

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  • DOI: https://doi.org/10.1007/s10008-003-0483-8

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