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INFLUENCE OF THE SUPORT TYPE ON THE ELECTROCATALYTIC PROPERTIES OF THIN VACUUM DEPOSITED FILMS OF COBALT OXIDES

V. Rashkova1,* , S. Kitova1, T.Vitanov2

Affiliation

  1. Central Laboratory of Photoprocesses “Acad. J .Malinowski”, BAS, Acad. G. Bonchev str., bl.109, Sofia 1113, Bulgaria
  2. Institute of Electrochemistry and Energy Systems, BAS, Acad. G. Bonchev str., bl.10, Sofia 1113, Bulgaria

Abstract

Cobalt oxides, obtain by vacuum co-evaporation of Co and TeO2 has been investigated as electrocatalysts for oxygen evolution and reduction reactions in alkaline media. Two types of bifunctional gas-diffusion oxygen electrodes (GDE) are prepared by direct deposition of catalytic oxide films on supports of teflonized carbon blacks or Ebonex (titanium sub oxides). The influence of the nature of the support on the surface morphology and electrochemical behavior of the films are followed by scanning electron microscopy (SEM) and cyclic voltammetry. It has been found, that the films on Ebonex electrodes have significantly higher number of active sites participating in the surface redox reactions, than those on the carbon electrodes..

Keywords

Thin films, Vacuum deposition, Cobalt oxides, Electrocatalysts, Gas diffusion electrodes.

Submitted at: April 19, 2005
Accepted at: May 26, 2005

Citation

V. Rashkova, S. Kitova, T.Vitanov, INFLUENCE OF THE SUPORT TYPE ON THE ELECTROCATALYTIC PROPERTIES OF THIN VACUUM DEPOSITED FILMS OF COBALT OXIDES, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 3, pp. 1341-1346 (2005)