Solid electrolyte NOx sensor using pyrochlore-type oxide electrode 1 Devoted to the late Dr Tetsuro

Abstract Solid electrolyte electrochemical devices based on sodium super-ionic conductor (NASICON: Na 1+ x Zr 2 Si x P 3− x O 12 ) and pyrochlore-type oxide (Pb 2 M 2 O 7− y : M=Ir, Ru 1− x Pb x ; x =0–0.75) electrodes were found to exhibit good performance for the potentiometric sensing of NO as well as NO 2 at 400°C. The EMF responses were almost linear to the logarithm of NO or NO 2 concentration. Among the elements tested, the device attached with Pb 2 Ru 1.5 Pb 0.5 O 7−y electrode gave excellent NO sensing properties, and the EMF changed with changing gas concentration of NO diluted in N 2 or NO diluted in an O 2 and N 2 mixture with negative or positive slope, respectively, while it kept almost constant to the concentration change of NO 2 and CO 2 diluted in air.

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