Abstract
Stabilized zirconia-based devices using oxide electrode (CdCr 2O 4) were fabricated and examined for selective amperometric detection of NO at high temperature. The CdCr 2O 4-attached tubular device showed quick and selective response to NO over NO 2 at 500 and 550°C, if the potential of sensing electrode was polarized properly at +100 mV vs the reference Pt electrode. The 90% response time of the device to 100 ppm NO was as short as ≈20 s at 500°C. The current response was well correlated to the NO concentration in the range of 0–200 ppm. Furthermore, the current response was hardly affected by the presence of the other gases, such as NO 2, H 2, CO, CH 4, CO 2, and water vapor. A compact, plate-type device which required no reference gas was also fabricated and its sensing properties were confirmed to be also rather good. A plausible NO sensing mechanism of the present devices was proposed on the basis of the sensing characteristics obtained.
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