Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 136, Issue 2, Pages 530-535Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.12.024
Keywords
Thermopower; Ion-conductor; Solid electrolyte; YSZ
Funding
- German Research Foundation [Mo1060/7-1, Ja648/14-1]
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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(O-2). 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. (C) 2009 Elsevier B.V. All rights reserved.
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