1. Zirconia-Based Gas Sensors Using Oxide Sensing Electrode for Monitoring Nox in Car Exhaust

  1. Sheng Yao,
  2. Bruce Tuttle,
  3. Clive Randall and
  4. Dwight Viehland
  1. N. Miura1,
  2. J. Wang1,
  3. M. Nakatou1,
  4. P. Elumalai1,
  5. S. Zhuiykov1,
  6. D. Terada1 and
  7. T. Ono2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291252.ch1

Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5

Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5

How to Cite

Miura, N., Wang, J., Nakatou, M., Elumalai, P., Zhuiykov, S., Terada, D. and Ono, T. (2005) Zirconia-Based Gas Sensors Using Oxide Sensing Electrode for Monitoring Nox in Car Exhaust, in Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5 (eds S. Yao, B. Tuttle, C. Randall and D. Viehland), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291252.ch1

Author Information

  1. 1

    Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga-shi, Fukuoka 816-8580, JAPAN

  2. 2

    R&D Division, Riken Corporation, Kumagaya-shi, Saitama 360-8522, JAPAN

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982350

Online ISBN: 9780470291252

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Keywords:

  • sensitivity;
  • mechanism;
  • characteristics;
  • concentration;
  • sensitivity

Summary

Solid-state electrochemical sensors using yttria-stabilized zirconia (YSZ) and oxide sensing electrode (SE) were fabricated and examined for NOx detection at high temperatures. Among various single-oxide SEs examined, NiO-SE for the mixed-potential-type NOx sensor was found to exhibit rather high sensitivity to NO2 even in the high temperature range of 800–900°C. This sensor showed quicker response and recovery transients in the presence of water vapor, compared with that in the dry sample gas. The sensing mechanism of this type of sensor was discussed on the basis of the catalytic activities to the electrochemical and nonelectrochemical reactions. It was also shown that the new-type complex-impedance-based (impedancemetric) NOx sensor attached with ZnCr2O4-SE exhibit good sensing characteristics to NOx at 700°C. Furthermore, the sensitivity to NO was almost equal to that to NO2 in the concentration range from 0 to ca. 200 ppm at 700°C. A linear dependence was observed between the sensitivity of the impedancemetric sensor and the concentration of NOx even in the presence of 8 vol. % H2O and 15 vol.% CO2. The planar laminated-type structure for the impedancemeteric NOx sensor was proposed for protecting NOx sensitivity from the influences of the co-existing combustible gases as well as the change in oxygen concentration in exhaust gas.