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Authors: LÁSZLÓ KISS, SÁNDOR KUNSÁGI-MÁTÉ.
DOI: 10.24193/subbchem.2020.3.06
Published Online: 2020-09-30
Published Print: 2020-09-30
pp.81-88
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ABSTRACT: In this paper suitability of glassy carbon electrode in numerous non-aqueous solvents used widely in electrochemistry (methanol, acetone, dichloromethane, nitrobenzene, nitromethane, 1-butanol, dimethyl sulfoxide, dimethyl formamide, tetrahydrofuran) was studied by changing the potential of preanodisation. The potential range studied in viewpoint of preanodisation effect was between 1 and 3 V. At higher potentials, glassy carbon electrode deactivated in many solvents which was clearly demonstrated using the aqueous solution of a redox probe 1,4-dihydroxybenzene. Due to the low permittivity some solvents (ethyl acetate, chloroform) were investigated using a preanodisation at 3 V because of the significant ohmic drop and the surface state also changed. Results highlight the importance of this limitation caused by polarizing above 2 V and it must be considered when glassy carbon electrode is selected for the investigations carried out in these conditions.
Key words: Glassy carbon; Preanodisation; Permittivity; Deactivation; Non-aqueous solvents
