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http://dx.doi.org/10.5369/JSST.2007.16.6.434

Potentiometric NOx sensors for automotive exhaust using YSZ(yittria stabilized zirconia) electrolyte  

Park, Jin-Su (Dept. of Materials Sci. and Eng., KAIST)
Park, Kwang-Chol (Dept. of Materials Sci. and Eng., KAIST)
Park, C.O. (Dept. of Materials Sci. and Eng., KAIST)
Publication Information
Journal of Sensor Science and Technology / v.16, no.6, 2007 , pp. 434-440 More about this Journal
Abstract
Two kinds of new NOx sensing mechanism was proposed and examined. One of those was potentiomtric sensor based on the measurement of decomposed oxygen from NO using YSZ porous diffusion barrier and Pd catalytic electrode. The sensor based on decomposed oxygen measurement responded to the range of 300 - 1000 ppm NO in $N_{2}$ environment and the sensitivities were coincident with theoretical values at 700 and $800^{\circ}C$ but the decomposition rate depended on gas flow rate. The other sensor was equilibrium potentiometric type using $Gd_{2}O_{3}$-nitrates solid solution as sensing material. The sensor using $Gd_{2}O_{3}$-nitrates solid solution was suitable for NOxxsensing at $700^{\circ}C$ in 5 % oxygen and the sensitivity was 19.3 mV/decade. However, long term stability of the sensing material at high temperature was not sufficient.
Keywords
NOx sensor; exhaust gas; YSZ; diffusion barrier;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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