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Röder-Roith, Ulla ; Rettig, Frank ; Röder, Timo ; Janek, Jürgen ; Moos, Ralf ; Sahner, Kathy:
Thick-film solid electrolyte oxygen sensors using the direct ionic thermoelectric effect.
In: Sensors and Actuators B: Chemical.
Bd. 136
(2009)
Heft 2
.
- S. 530-535.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2008.12.024
Volltext
Angaben zu Projekten
| Projekttitel: |
Offizieller Projekttitel Projekt-ID Ohne Angabe Mo1060/7-1 Ohne Angabe Ja648/14-1 |
|---|---|
| Projektfinanzierung: |
Deutsche Forschungsgemeinschaft |
Abstract
A screen-printed direct ionic thermoelectric oxygen sensor based on 8 mol% Y2O3 stabilized zirconia (YSZ) is presented. Within the device, a temperature gradient is applied to the YSZ film via an integrated heater, and the resulting thermovoltage is measured. Theoretical considerations on oxygen ion conductors predict a well-defined dependency of the thermopower on the oxygen partial pressure p(O2). Experimental results on the present thick-film device are shown to agree well with the theory. Besides being intrinsically geometry-independent, the present potentiometric sensor showed no cross-sensitivity to a variety of reducing and oxidizing gases that are commonly present in the exhaust. In addition, a very low temperature dependence of the thermopower was observed.