Journal of Electroceramics

, Volume 13, Issue 1–3, pp 771–774 | Cite as

Praseodymium-Cerium Oxide as a Surface-Effect Gas Sensor

  • Todd S. Stefanik
  • Harry L. Tuller


The gas sensing behavior of praseodymium doped cerium oxide (Pr x Ce1 − xO2 or PCO) has been examined for 0–1000 ppm CO or H2 in a 10% O2 atmosphere at temperatures ranging from 250–350_∘C. Total conductivity as a function of temperature suggests that oxygen diffusion kinetics are slow below approximately 350_∘C. Devices with x = 0.05 and 0.10 show stable, n-type gas sensing response, while those with x = 0.20 exhibit significant drift in sensor output, presumably due to bulk oxygen migration. The response to CO is significantly stronger than that to H2 at 300_∘C, and at 350_∘C the response to H2 is nearly zero, resulting in a CO-selective gas sensing element. Suggestions for the source of selectivity in PCO are presented.


selectivity sensitivity CO sensing 


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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Todd S. Stefanik
    • 1
  • Harry L. Tuller
    • 1
  1. 1.Massachusetts Institute of Technology, Department of Materials Science and EngineeringCrystal Physics and Electroceramics LaboratoryCambridgeUSA

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