Abstract
All solid‐state sulfur oxides (SOx) sensor devices combined with a sodium ionic conductor (Na5DySi4O12) disk and metal sulfide‐sensing electrodes synthesized via solution routes have been systematically investigated for the detection of SO2 in the range of 20–200 ppm at 150–400°C. Among the various sulfide‐sensing electrodes tested, the metal monosulfide‐based electrodes gave good SO2 sensitivity at 400°C. The Pb1−xCdxS (x=0.1, 0.2)‐based solid electrolyte sensor element showed the best sensing characteristics, i.e., the EMF response was almost linear to the logarithm of SO2 concentration in the range between 40 and 400 ppm, with a 90% response time to 100 ppm SO2 of about 3–15 min, and also showed high selectivity to SO2 at 400°C.
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