Glassy carbon modified electrode: Polymer and supramolecular assembly of Co(II)-[Tetra(O-Aminophenyl) Porphyrin] new material for electrocatalytic assays

M. A. Riquelme, M. A. Lucero, M. Villagrán, M. C. Arévalo, A. Hernández-Creus, J. H. Velez, M. J. Aguirre, R. Arce, G. Ramírez

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)9738-9747
Number of pages10
JournalInternational Journal of Electrochemical Science
Volume7
Issue number10
Publication statusPublished - 1 Dec 2012

Keywords

  • Cobalt
  • Modified electrode
  • O2
  • Porphyrin
  • Supramolecular

ASJC Scopus subject areas

  • Electrochemistry

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