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Electromotive Force of the Hydrogen Concentration Cell based on SrCe<SUB>0.95</SUB>Yb<SUB>0.05</SUB>O<SUB>3&minus;&delta;</SUB> Solid Electrolyte
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1987
Year
Materials ScienceOxygen VacancyChemical EngineeringSolid ElectrolyteEngineeringBattery Electrode MaterialsElectrode-electrolyte InterfaceElectrolyzer CellFundamental ElectrochemistryHydrogen Concentration CellEmf ValuesElectromotive ForceChemistryHydrogenOxygen Concentration CellElectrochemical ProcessElectrochemical InterfaceElectrochemistry
To clarify the conduction mechanism of a new type proton conductive solid electrolyte SrCe0.95Yb0.05O3−δ, emf’s of a gas concentration cell based on this material were measured for various electrode potentials in the temperature range 973-1373 K. It was found that the emf is settled at a unique value only when both the oxygen and the hydrogen potentials of the electrodes were specified. The model of the conduction mechanism to restrict the charge carriers to only interstitial proton and positive hall could not account for all the observed potential dependances of emf values. From the results on the cells operated as an oxygen concentration cell, it is strongly suggested that oxygen vacancy acts as one of the charge carriers of this electrolyte.