Abstract

DREYSE, PAULINA; RAMIREZ, GALO; RIQUELME, ANDREA  and  ISAACS, MAURICIO. SPECTROELECTROCHEMICAL STUDIES ON ITO MODIFIED ELECTRODES WITH A CONDUCTING COBALT (II) MACROCYCLE FILM IN THE ELECTROCHEMICAL REDUCTION OF CO₂. J. Chil. Chem. Soc. [online]. 2006, vol.51, n.2, pp.923-926. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072006000200017.

The spectroelectrochemical properties of a conducting polymer derived from Co(II) tetra-3-amino-phenyl-porphyrin,(poly-Co(II)-TAPP) were studied towards the electrochemical reduction of CO₂ on ITO surface. Under inert atmosphere, the results show that the polymer present a stable Co(I) oxidation state only in basic pH while in more acidic solution this Co(I) does not stabilize. Under CO₂ atmosphere the reduced polymer forms a stable adduct with no clear electronic localization. The formation and the stability of this adduct could explain the wide distribution of reaction products

Keywords : electrochemical reduction of carbon dioxide; porphyrins; conducting polymers.