Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Limit-current type zirconia oxygen sensor with porous diffusion layer

다공성 확산층을 이용한 한계전류형 지르코니아 산소센서

  • Oh, Young-Jei (Thin Film Materials Research Center, Korea Institute of Science and Technology) ;
  • Lee, Chil-Hyoung (Thin Film Materials Research Center, Korea Institute of Science and Technology)
  • 오영제 (한국과학기술연구원, 박막재료연구센터) ;
  • 이칠형 (한국과학기술연구원, 박막재료연구센터)
  • Published : 2008.09.30
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Abstract

Simple, small and portable oxygen sensors were fabricated by tape casting technique. Yttria stabilized zirconia containing cordierite ceramics (YSZC) were used as a porous diffused layer of oxygen in pumping cell. Yttria stabilized zirconia (YSZ) solid electrolyte, YSZC porous diffusion layer and heater-patterned ceramic sheets were prepared by co- firing method. Limit current characteristics and the linear relationship of current to oxygen concentration were observed. Viscosity variation of the slurries both YSZ and YSZC showed a similar behavior, but micro pores in the fired sheet were increased with increasing of the cordierite amount. Molecular diffusion was dominated due to the formation of large pores in porous diffusion layer. The plateau range of limit current in porous-type oxygen sensor was narrow than the one of aperture-type oxygen sensor. However limit current curve was appeared in porous-type oxygen sensor even at the lower applied voltage. The plateau range of limit-current was widen as increasing the thickness of porous diffusion layer of the YSZ containing cordierite. Measuring temperature of $600{\sim}650^{\circ}C$ was recommended for limit-current oxygen sensor. Porous diffusion layer-type oxygen sensor showed faster response than the aperture-type one and was stable up to 30 days running without any crack at interface between the layers.

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References

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