A glassy carbon electrode was electrochemically coated with a Co(II)[tetra(o-aminophenyl) porphyrin] (Co(II)TAPP) polymeric layer. The poly-Co(II)TAPP modified electrode presented Z 60.26 nm and RMS 4.73 nm values. In addition, a supramolecular assembly of Co(II)TAPP physisorbed on the polymeric film of the same porphyrin modified electrode was prepared(SMA-Co(II)TAPP/poly-Co(II)TAPP/GC). This supramolecular assembly presented Z 115.55 nm and RMS 37 nm values obtained byatomic force microscopy (AFM) surface characterization. The polymer film and the φ-φ staking supramolecular assemblies were characterized by atomic force microscopy, scanning electron microscopy (SEM) and cyclic voltammetry (CV). These modified electrodes were compared as electrocatalysts for oxygen reduction reaction at pH 6.8, phosphate buffer. Oxygen electrocatalytic reduction at the supramolecular modified electrode started at 0.20 V vs. Ag/AgCl, shifting the potential ca. 0.15 V with respect to the polymer modified electrode. On the other hand, under the same experimental conditions the catalytic current increased ca. 30 %. Carbon dioxide electrocatalytic reduction assays afforded similar results at both modified electrodes. Nevertheless, within the studied potential range for the reaction, hydrogen evolution takes place decreasing thus the carbon dioxide electrocatalytic reduction.
|Número de páginas||10|
|Publicación||International Journal of Electrochemical Science|
|Estado||Publicada - 1 dic 2012|
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