Potentiometric electrochemical sensor based on doped cubic stabilized zirconia is one of the most successful applications on measuring oxygen content in steel making and in the exhaust of the automobiles. However its usage is generally limited to high temperature, normally at above 700℃.Sometimes it is needed to measure the oxygen content at low temperature where zirconia sensor does not work. The present work concerns on the new concept of oxygen sensor operating at low temperature with the structure of
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where β - β'alumina is adopted as an electrolyte on both side of which yttria stabilized zirconia layer is attached. Zirconia layers are thought to maintain their oxygen ion activities in equilibrium with ambient oxygen partial pressure. The measured electromotive force shows a well-defined Nernstian relation with oxygen partial pressure at 500℃.
