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Impedancemetric Technique for NOx Sensing Using a YSZ-Based Electrochemical Cell

Published online by Cambridge University Press:  26 February 2011

L. Peter Martin ,
Leta Y. Woo  and
Robert S. Glass
L. Peter Martin
Affiliation:
[email protected], Lawrence Livermore National Lab., Engineering Technologies Division, P.O. Box 808, L - 353, Livermore, CA, 94551, United States, 925-423-9831
Leta Y. Woo
Affiliation:
[email protected], Lawrence Livermore National Laboratory, Livermore, CA, 94551, United States
Robert S. Glass
Affiliation:
[email protected], Lawrence Livermore National Laboratory, Livermore, CA, 94551, United States
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Abstract

An impedancemetric technique for NOx sensing using a yttria-stabilized zirconia (YSZ) electrochemical cell is reported. The cell consists of a dense YSZ substrate disk with two YSZ/metal-oxide electrodes deposited on the same side. The cell is completely exposed to the test gas (no air reference). The NOx and O2 response of the cell were evaluated during constant-frequency operation at frequencies in the range from 1 to 1000 Hz. At 10 Hz, the NOx response (as measured by phase angle shift) is shown to be linear with concentration over the range from 8-50 ppm, with comparable response to both NO and NO2. A method of operation is described which enables compensation for the O2 response at oxygen concentrations greater than approximately 4%. This mode of operation allows the sensor to provide sub-10 ppm detection of NOx irrespective of the O2 concentration. The sensor exhibits good stability during continuous operation for more than 150 hr. It was observed that the O2 response of the cell may be too slow to be of practical use, taking several minutes to equilibrate after changing the concentration by a few percent. However, data will be presented which demonstrate that this response is related to the metal oxide used for the electrode, and that more rapid response times can be achieved by modification of the electrode material.

Keywords

sensorionic conductoroxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA12-04
Copyright
Copyright © Materials Research Society 2007

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References

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