Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Oxygen sensor for the low temperature-measurement using yttria stabilized zirconia(YSZ) electrolyte and Ag electrode

YSZ 전해질과 은 전극을 이용한 저온 산소센서에 대한 연구

  • Yang, Young-Chang (Department of Material Science & Engineering, Korea Advanced Institute of Science & Technology (KAIST)) ;
  • Park, Chong-Ook (Department of Material Science & Engineering, Korea Advanced Institute of Science & Technology (KAIST))
  • Published : 2006.03.31
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Abstract

Silver electrode having a high Electrocatalytic activity is oxygen-permeable electrode, in which oxygen ad-atoms are adsorbed and moved toward YSZ electrolyte by bulk diffusion. It is the different point in comparison to usual porous electrodes, especially platinum, which react with oxygen only in TPBs(Three Phase Boundaries). Also ad-atoms at TPBs of Pt are diffused to YSZ electrolyte by interfacial diffusion mechanism. These properties were used for turning down the operating temperature of YSZ from over $600^{\circ}C$ to below $450^{\circ}C$. The different heat-treatment temperature between a working electrode and a reference electrode suppresses the formation of silver oxides and reduces a volatility of Ag as well. Above all, these own characteristics and special processes of Ag improved a long-term stability of a oxygen sensor.

Keywords

References

  1. R. Radhakrishnan, A. V. Virkar, S. C. Singhal, G. C. Dunham, and O. A. Marina, 'Desingn, fabrication and characterization of a miniaturized series-connected potentiometric oxygen sensor', Sensors and Actuators B, 2004
  2. 이재현, 이덕동, '$CaF_2$를 이용한 고체전해질 산소센서의 제조및 그 특성', 센서학회지, 제3권, 제2호, pp. 40-49, 1994
  3. 손정덕, 최시영, '$Al_2O_3$가 첨가된 지르코니아 산소센서의 제조 및 그 특성', 센서학회지, 제1권, 제1호, pp. 93-100, 1992
  4. T. Kenjo and H. Takiyarna, 'Oxygen permeation in Ag/YSZ air cathodes', Electrochemica Acta, vol. 39, no. 18, pp. 2685-2692, 1994 https://doi.org/10.1016/0013-4686(94)00307-6
  5. A. G. Motimer and G. P. Reed, 'Development of a robust electrochemical oxygen sensor', Sensors and Actuators B, vol. 24/25, pp. 328, 1995
  6. H. Kaneko, T. Okamura, and H. Taimatsu, 'Charac-terization of zirconia oxygen sensors with a molten internal reference for low-temperature operation', Sensors and Actuators B, vol. 93, pp. 205-208, 2003 https://doi.org/10.1016/S0925-4005(03)00214-4
  7. T. Arakawa, A. Saito, and J. Shiokawa, 'Surface study if a Ag electrode in a solid electrolyte used as oxygen sensor', Applications of Surface Science, vol. 16, pp. 365-372, 1983 https://doi.org/10.1016/0378-5963(83)90080-6
  8. T. Arakawa, A. Saito, and J. Shiokawa, 'XPS for in situ observation of an Ag electrode on a solid electrolyte used as oxygen sensor', Chemical Physics Letters, vol. 194, no. 3, pp. 250-252, 1983
  9. M. Rosch, G. Reinhardt, and W. Gopel, 'In-situ spectroscopic investigations if silver electrodes in stabilized zirconia', Solid State Ionics, vol. 136-137, pp. 791-799, 2000

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