Suppression of Humidity Interference with the Amperometric Response of PbSnF4-Based Oxygen Sensors Operating at Ambient Temperature.

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Solid-state oxygen sensors based on two superionic conductors, of the type, Ag_??_Ag6I4WO4_??_PbSnF4-Ca(OH)2_??_ sensing electrode, O2, sensing electrode: a mixture of a carbon material, iron(II) phthalocyanine (FePc) and PbSnF4 were constructed The hydroxide Ca(OH)2 was incorporated in PbSnF4 at different compositions of 0-23 mass% to suppress humidity interference with the response of the short circuit current. Similar linear relations were found between the short circuit current and the square root of oxygen partial pressure regardless of incorporation of Ca(OH)2. On the other hand, the incorporation suppressed an increase in short circuit current caused by humidity, without undesirable effects on response time and sensitivity. The optimized content of Ca(OH)2 was in a range of 13-15 mass%. The mechanism of the suppression was also discussed.
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