Microporous zeolite modified yttria stabilized zirconia (YSZ) sensors for nitric oxide (NO) determination in harsh environments

This study is focused on development of a nitrogen monoxide (NO) sensor capable of operation in harsh environments, as exemplified by automotive exhaust streams. The basis of the sensor is a mixed potential response generated by exposure of gases to a platinum–yttria stabilized zirconia (Pt–YSZ) int...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 82; no. 2; pp. 142 - 149
Main Authors Szabo, Nicholas F, Du, Hongbin, Akbar, Sheikh A, Soliman, Ahmed, Dutta, Prabir K
Format Journal Article
LanguageEnglish
Published Elsevier B.V 28.02.2002
Subjects
Automotive sensor
Sensor design
Zeolite Y
Zeolite Y
Automotive sensor
Sensor design
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Summary:This study is focused on development of a nitrogen monoxide (NO) sensor capable of operation in harsh environments, as exemplified by automotive exhaust streams. The basis of the sensor is a mixed potential response generated by exposure of gases to a platinum–yttria stabilized zirconia (Pt–YSZ) interface. The asymmetry between the two Pt electrodes on YSZ is generated by covering one of the electrodes with a zeolite, which helps promote the NO/NO 2 equilibrium prior to the gases reaching the electrochemically active interface. The mixed potential generated is logarithmically related to NO concentration (0–1000 ppm) at temperatures between 500 and 700 °C, the optimum temperature being 500 °C. The microporosity of the zeolite makes it permeable to oxygen, thus, minimizing the interference to O 2. The sensor shows interference from CO and NO 2. Three sensor designs have been examined, including a planar design that can be packaged appropriately for surviving automotive exhaust streams. Automotive tests indicate that the sensor is capable of detecting NO x in engine exhausts.
ISSN:0925-4005
1873-3077
DOI:10.1016/S0925-4005(01)00999-6