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VACUUM DEPOSITED FILMS OF COBALT OXIDES AS ELECTROCATALYSTS FOR OXYGEN REACTIONS

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. Central Laboratory for Electrochemical Power Sources, BAS Acad. G. Bonchev str., bl.10, Sofia 1113, Bulgaria

Abstract

Cobalt oxides, obtained by vacuum co-evaporation of Co and TeO2 are investigated as electrocatalysts for oxygen reactions in alkaline media. Bifunctional gas-diffusion oxygen electrodes (GDE) are prepared by direct deposition of catalyst films on gas-diffusion membranes (GDM). The influence of thermal annealing on the surface morphology, the composition and the electrochemical behaviour of the films on GDM are followed by scanning and transmission electron microscopy and cyclic voltammetry. It is found that thermal annealing of GDEs at 100 oC leads to an abrupt increase in the concentration of the active sites participating in the surface redox reactions..

Keywords

Thin films, Vacuum deposition, Cobalt oxides, Electrocatalysts.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

V. Rashkova, S. Kitova, T. Vitanov, VACUUM DEPOSITED FILMS OF COBALT OXIDES AS ELECTROCATALYSTS FOR OXYGEN REACTIONS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 451-455 (2005)