Abstract
Zirconia electrochemical oxygen sensor is widely used today in different industrial power and chemicals production applications (O2-Analyzer) and transportation (lambda sensor). Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA) was invented in 80th and shown high efficiency in the catalytic activity and selectivity increase of the gas exposed electrodes. For the first time NEMCA was investigated for the activation and re-activation of the industrial potentiometric oxygen sensor based on stabilized zirconia solid electrolyte. Electrochemical promotion of O2-sensors with Pt-cermet electrodes aged in the field was significant with up to 5 times in the sensor’s impedance reduction. Stability tests on the NEMCA activated O2-sensors were showing just a minor impedance increase after 2 weeks. Sensor response time was also reduced using NEMCA by ~5–10 % with up to 3 times the sensor’s signal noise reduction on the aged zirconia oxygen electrochemical cells.
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Acknowledgment
The authors would like to thank Rosemount Analytical Inc. for the research program support and Professor Costantinos G. Vayenas as well as Dr. Susanne Brosda for the sharing numerous NEMCA publications and NEMCA/EPOC/ICP knowledge.
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Shuk, P., Jantz, R. (2016). Aged Zirconia Electrochemical Oxygen Sensor Activation and Re-activation Using NEMCA. In: Mukhopadhyay, S. (eds) Next Generation Sensors and Systems. Smart Sensors, Measurement and Instrumentation, vol 16. Springer, Cham. https://doi.org/10.1007/978-3-319-21671-3_6
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DOI: https://doi.org/10.1007/978-3-319-21671-3_6
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