Hostname: page-component-8448b6f56d-c47g7 Total loading time: 0 Render date: 2024-04-18T11:10:21.250Z Has data issue: false hasContentIssue false
  • English
  • Français

Electrochemical NOx Sensors for Automotive Diesel Exhaust

Published online by Cambridge University Press:  11 February 2011

Louis P. Martin ,
Ai-Q. Pham  and
Robert S. Glass
Louis P. Martin
Affiliation:
Lawrence Livermore National Laboratory P.O. Box 808, L-353 Livermore, CA, 94551–0808, U.S.A.
Ai-Q. Pham
Affiliation:
Lawrence Livermore National Laboratory P.O. Box 808, L-353 Livermore, CA, 94551–0808, U.S.A.
Robert S. Glass
Affiliation:
Lawrence Livermore National Laboratory P.O. Box 808, L-353 Livermore, CA, 94551–0808, U.S.A.
Get access

Abstract

New emissions regulations will increase the need for compact, inexpensive sensors for monitoring and control of automotive exhaust gas pollutants. Species of interest include hydrocarbons, carbon monoxide, and oxides of nitrogen (NOx). The current work is directed towards the development of fast, high sensitivity electrochemical NOx sensors for automotive diesel applications. We have investigated potentiometric NO sensors with good sensitivity and fast response when operated in 10% O2. The sensors consist of yttria-stabilized zirconia substrates attached with NiCr2O4 sensing electrodes and Pt reference electrodes. A composite NiCr2O4:Rh sensing electrode is shown to give significantly faster response than NiCr2O4 alone. The exact role of the Rh in enhancing the response speed is not clear at present. However, the Rh appears to accumulate at the contacts between the NiCr2O4 particles and may enhance the inter-particle electronic conduction. Ongoing testing of these sensors is being performed to elucidate the sensing mechanisms and to quantify cross sensitivity to, for example, NO2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE11.3
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Menil, F., Coillard, V., and Lucat, C., Critical review of nitrogen monoxide sensors for exhaust gases of lean burn engines, Sensors Actuators B 67 (2000) 1–23.Google Scholar
2. Miura, N., Lu, G., and Yamazoe, N., Progress in mixed-potential type devices based on solid electrolyte for sensing redox gases, Solid State Ionics 136–137 (2000) 533–542.Google Scholar
3. Ono, T., Hasei, M., Kunimoto, A., Yamamoto, T., and Noda, A., Performance of the NOx sensor based on mixed potential for automobiles in exhaust gases, JSAE Review 22 (2001) 49–55.Google Scholar
4. Zhuiykov, S., Nakano, T., Kunimoto, A., Yamazoe, N., and Miura, N., Potentiometric NOx sensor based on stabilized zirconia and NiCr2O4 sensing electrode operating at high temperatures, Electrochem. Comm. 3 (2001) 97–101.Google Scholar
5. Bruser, V., Lawrenz, U., Jakobs, S., Mobius, H. -H., and Schronauer, U., NOx determination with galvanic zirconia solid electrolyte cells, Solid State Phen. 39–40 (1994) 269–272.Google Scholar
6. Grilli, M. L., Di Bartolomeo, E., and Traversa, E., Electrochemical NOx sensors based on interfacing nanosized LaFeO3 perovskite-type oxide and ionic conductors, J. Electrochem. Soc. 148 (2001) H–98–H102.Google Scholar
7. Wachsman, E. D. and Jayaweera, P., Selective detection of NOx by differential electrode equilibria, in Solid State Ionic Devices II-Ceramic Sensors, edited by Wachsman, E. D. et al. (The Electrochemical Society Proceedings Series, Pennington, NJ, 2001), pp. 298–304.Google Scholar
8. Lu, G., Miura, N., and Yamazoe, N., High-temperature sensors for NO and NO2 based on stabilized zirconia and spinel-type oxide electrodes, J. Mater. Chem. 7 (1997) 1445–1449.Google Scholar
9. Martin, L. P., Pham, A.-Q., Glass, R. S., Effect of Cr2O3 electrode morphology on the nitric oxide response of a stabilized zirconia sensor, submitted to Sensors and Actuators, B (2002).Google Scholar