Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Potentiometric NOx sensors for automotive exhaust using YSZ(yittria stabilized zirconia) electrolyte

YSZ 전해질을 이용한 농담전지식 자동차용 NOx센서

  • 박진수 (한국과학기술원 신소재공학과) ;
  • 박광철 (한국과학기술원 신소재공학과) ;
  • 박종욱 (한국과학기술원 신소재공학과)
  • Published : 2007.11.30
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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.

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References

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