Nasicon sensor for NO detection in the automotive exhaust |
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Authors: | V P Kotzeva R V Kumar |
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Institution: | (1) University of Cambridge, Cambridge, UK |
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Abstract: | Development of a sensor where both electrodes are exposed to the same gas offers simple design with no need for a separate
reference gas with a complicated sealing system. Such sensors are still in research stage. The NASICON electrolyte, which
has high ionic conductivity at the temperature of the exhaust gas mixture, allows such sensors to work without a heater, making
a simple and miniaturised construction technique. Using two asymmetric electrodes, where each electrode has a different catalytic
activity at a given temperature, can result in anemf, which is a function of partial pressure of NO.
A NASICON sensor with SmFeO3 as a sensing electrode and Au as an oxygen electrode was calibrated as a NO sensor and tested in oxidising atmosphere in
simulated exhaust gases. The sensor responded quickly with reproducibleemf values.
Paper presented at the 9th EuroConference on Ionics, Ixia, Rhodes, Greece, Sept. 15 – 21, 2002. |
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