Abstract
The oxidation of methanol at poly(Ni II-tetramethyldibenzotetraaza[14] annulene) [Ni II-(tmdbta)]-modified glassy carbon electrodes prepared by cyclic voltammetry are investigated by thin-film-electrode poly([Ni II-(tmdbta)]) measurements. The poly([Ni II-(tmdbta)])-modified electrode shows higher activity towards methanol oxidation in the Ni III(tmdbta) state. The poly([Ni II-(tmdbta)])-modified electrode is measured by cyclic voltammetry polarization curves and 8.5 h polarizations. The mechanisms of methanol oxidation are studied by cyclic voltammetry and polarization curves, and a reaction mechanism is proposed. The rate-determining steps are experimentally identified and the rate equation of methanol oxidation is obtained. The poly([Ni II-(tmdbta)])-modified electrode remains stable during anodic polarization at 0.45 V for 8.5 h in 0.1 M NaOH solution with or without 0.1 M methanol.
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