PREPARATION AND CHARACTERIZATION OF OXIDE FILM ELECTRODES

In this paper are presented data on the preparation and characterizati on of different oxide electrodes. RuO2-TiO2, IrO2-TiO2, and SnO2-Sb2O5 mixed-oxide films have been taken as model systems. For the first, th e traditional preparation method based on the pyrolysis of precursor s alt deposits was adopted. For the SnO2-based films, the spray pyrolysi s preparation has been used. The characterization of RuO2-TiO2 films c onfirms the existence of a solid solution between the two component ox ides over a wide composition range. Rutherford backscattering spectrom etry confirms the occurrence of segregation of titanium oxide species in the outermost part of the films. Nuclear reaction analysis indicate s that large amounts of carbon and hydrogen impurities are trapped in the oxide films. SnO2-based films were found to be less porous and che mically more simple. The differences between the two systems have been discussed in terms of the preparation method and the differences in c hemical properties of the precursors.