A self-contained, miniaturized, electrochemical-type solid-reference oxygen sensor is described which uses yttria-doped ceria (YDC) as an oxygen ion conducting solid electrolyte. Unlike conventional oxygen sensors, in which one side of the sensor needs to be directly exposed to the air reference, the oxygen sensor presented in this paper exploits a solid solution of 25mol% zirconia in ceria as the reference. Designing a combination structure, the sensing capability of this sensor is compared with a YSZ electrolyte oxygen sensor under the same conditions. This novel oxygen sensor exhibits an anomalous behavior in transition from rich-to-lean regimes where the polarity of the created voltage changes from a positive value of +500mV to a negative value of -150mV at λ = 1.01.
Bibliographical noteFunding Information:
The work of the first four authors was supported by the Research Council of the University of Tehran. The authors would like to thank Dr. M. Sereshti from Department of Chemistry of the University of Tehran for his help in promoting this work, and to Mr. S. Kiani for assistance in performing the SEM analysis.
- Oxygen sensor
- Solid-state reference