Electrochemical reactions of catechol, methylcatechol and dopamine at tetrahedral amorphous carbon (ta-C) thin film electrodes

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Title: Electrochemical reactions of catechol, methylcatechol and dopamine at tetrahedral amorphous carbon (ta-C) thin film electrodes
Authors: Palomäki, Tommi | Chumillas, Sara | Sainio, Sami | Protopopova, Vera | Kauppila, Minna | Koskinen, Jari | Climent, Victor | Feliu, Juan M. | Laurila, Tomi
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Tetrahedral amorphous carbon | Glassy carbon | Dopamine | Catechol | Polydopamine | Cyclic voltammetry
Knowledge Area: Química Física
Issue Date: Oct-2015
Publisher: Elsevier
Citation: Diamond and Related Materials. 2015, 59: 30-39. doi:10.1016/j.diamond.2015.09.003
Abstract: The electrochemical reactions of dopamine, catechol and methylcatechol were investigated at tetrahedral amorphous carbon (ta-C) thin film electrodes. In order to better understand the reaction mechanisms of these molecules, cyclic voltammetry with varying scan rates was carried out at different pH values in H2SO4 and PBS solutions. The results were compared to the same redox reactions taking place at glassy carbon (GC) electrodes. All three catechols exhibited quasi-reversible behavior with sluggish electron transfer kinetics at the ta-C electrode. At neutral and alkaline pH, rapid coupled homogeneous reactions followed the oxidation of the catechols to the corresponding o-quinones and led to significant deterioration of the electrode response. At acidic pH, the extent of deterioration was considerably lower. All the redox reactions showed significantly faster electron transfer kinetics at the GC electrode and it was less susceptible toward surface passivation. An EC mechanism was observed for the oxidation of dopamine at both ta-C and GC electrodes and the formation of polydopamine was suspected to cause the passivation of the electrodes.
Sponsor: Authors wish to acknowledge the financial support by the Finnish Parkinson Foundation (T.P.), the Finnish Funding Agency for Innovation (grant number 211488) (T.P., S.S. and T.L.), the Academy of Finland (grant number 285015) (T.L.) and MINECO project CTQ2013-44083-P (J.F.M.).
URI: http://hdl.handle.net/10045/49555
ISSN: 0925-9635 (Print) | 1879-0062 (Online)
DOI: 10.1016/j.diamond.2015.09.003
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.diamond.2015.09.003
Appears in Collections:INV - EQSUP - Artículos de Revistas

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