PREPARATION AND ELECTROCHEMICAL-BEHAVIOR OF SB2O5 FILMS

Sb2O5 films of various thicknesses were prepared on glass or glassy carbon using a chemical vapour deposition-spraying technique. A 0.5 M SbCl5-ethyl acetate solution was used as a spray. This evaporated in front of the heated substrate and the hydrolysis reaction {A figure is presented} took place, leaving a homogeneous antimony oxide film adherent to the substrate surface. The effect of the thickness of the prepared film on its physical properties was studied. The electrochemical behaviour of electrodes of the oxide film in three different redox couples was investigated. The results reveal that the charge transfer reaction occurring at the electrode-electrolyte interface takes place via tunnelling of the electrons through the barrier formed by the space charge layer into the Sb2O5 conduction band. © 1990.