Dopamine oxidation at gold electrodes: mechanism and kinetics near neutral pH | Zendy

Raphael P. Bacil | Zendy; Lifu Chen | Zendy; Sílvia Helena Pires Serrano | Zendy; Richard G. Compton | Zendy

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Dopamine oxidation at gold electrodes: mechanism and kinetics near neutral pH

Author(s) -

Raphael P. Bacil,

Lifu Chen,

Sílvia Helena Pires Serrano,

Richard G. Compton

Publication year - 2019

Publication title -

physical chemistry chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.053

H-Index - 239

eISSN - 1463-9084

pISSN - 1463-9076

DOI - 10.1039/c9cp05527d

Subject(s) - kinetics , electrode , dopamine , chemistry , mechanism (biology) , inorganic chemistry , physics , neuroscience , quantum mechanics , biology

The two-electron electrochemical oxidation of dopamine is studied voltammetrically at gold macroelectrodes around neutral pH with simulations used to give kinetic and mechanistic data. In particular, the system shows "potential inversion" in which the thermodynamic oxidation potential of dopamine to form the corresponding semi-quinone formation occurs at a more positive potential than that of the oxidation of the semi-quinone to the quinone form. The use of Tafel slopes measured from the voltammograms as a function of the voltage scan rate is show to be a particularly sensitive indicator of mechanism showing the effect of the follow-up chemistry in which the two-electron oxidation product undergoes an irreversible cyclization reaction.

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