Abstract
The galvanic cell technique involving the stabilized zirconia solid electrolyte was applied to studying the oxidation of cobalt. The cell was the stacked pellet type and was operated in argon and in air. The results obtained were as follows:(1) The equilibrium values of electromotive force (emf) were measured in argon for the cell: Pt, Co-CoO or CoO-Co3O4|ZrO2(+CaO)|Ni-NiO, Pt. The standard free energies of formation of CoO and Co3O4 were represented by the equations(This article is not displayable. Please see full text pdf.) (2) The emf’s of the cell: Pt, CoO or Co3O4|ZrO2(+CaO)|air, Pt were measured in air on heating and cooling at a constant rate. The emf’s changed with temperature corresponding to the formation of CoO and Co3O4 on the thermogravimetric curves.(3) The changes of emf with time were measured in air at various temperatures for the cell: Pt, Co|ZrO2(+CaO)|air, Pt. At temperatures below 900°C, it was confirmed that CoO and Co3O4 were successively formed on Co. At temperatures above 900°C, CoO was only the oxide formed on Co. The emf decay curves after the cathodic polarization of the oxidized sample indicated that the oxidation process seemed to be more complicated. Further, it was found that the emf oscillated after Co was completely consumed at the metal-electrolyte interface.
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