Abstract
The lowest limit of operation temperature for the solid electrolyte oxygen sensor was significantly reduced by using perovskite-type oxide electrodes and a ceria-based electrolyte. In particular, the sensor with the La 0.6Sr 0.4Co 0.98Ni 0.02O 3 electrode and (CeO 2) 0.8(SmO 1.5) 0.2 electrolyte exhibited theoretical e.m.f. even at 200 °C. The lowest limit of operation temperature of the oxygen sensor was closely related to the cathodic overpotential, the electrode conductivity and the rate of oxygen isotopic exchange reaction.
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