PREPARATION AND CHARACTERIZATION OF THIN CO3O4 AND MNCO2O4 FILMS PREPARED ON GLASS SNO2-F BY SPRAY-PYROLYSIS AT 150-DEGREES-C FOR THE OXYGEN-ELECTRODE

It is shown that pure Co3O4 and MnCo2O4 films can be prepared at 150 d egrees C by spray pyrolysis of the metal nitrate aqueous solutions, pr ovided that the flow rate and concentrations are lowered and optimized in comparison with classical procedures, and that undecomposed nitrat es are further eliminated by prolonged washing. High roughness factors are obtained, yielding electrodes with a higher activity for the oxyg en evolution reaction than electrodes prepared by conventional spray p yrolysis at higher temperatures.