Mixed potential NH3 sensor with LaCoO3 reference electrode

Mixed potential NH3 sensor with LaCoO3 reference electrode

Mixed potential NH3 sensors using an yttria stabilized zirconia (YSZ, 8mol% Y2O3) electrolyte were prepared and evaluated at 700°C. Various oxide materials were tested as a sensing electrode, among which In2O3 sensing electrode showed the highest sensitivity to NH3 with good stability. However, the...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Vol. 176; pp. 966 - 970
Main Authors: Lee, Ingun, Jung, Byounghyo, Park, Jinsu, Lee, Chunbum, Hwang, Jeongsug, Park, C.O.
Format: Journal Article
Language:English
Published: Elsevier B.V 01-01-2013
Subjects:
Actuators
ammonia
Detection
Electrodes
electrolytes
EMF
In2O3
LaCoO3
NH3 sensor
nitric oxide
Nitrogen dioxide
Oxides
Reference electrode
Sensors
Yttria stabilized zirconia
NH3 sensor
LaCoO3
In2O3
Reference electrode
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Summary:Mixed potential NH3 sensors using an yttria stabilized zirconia (YSZ, 8mol% Y2O3) electrolyte were prepared and evaluated at 700°C. Various oxide materials were tested as a sensing electrode, among which In2O3 sensing electrode showed the highest sensitivity to NH3 with good stability. However, the EMF of the sensor decreased to 50% of its original value when 150ppm NO2 was added to gas containing NH3. In an effort to eliminate interference from NO2, a new concept of a mixed potential sensor using an oxide reference electrode of LaCoO3 instead of a noble metal is introduced. It was found that the interfering effect of the new sensor to 150ppm NO2 was reduced from 50% to 10%. The EMF showed little change upon exposure to 1000ppm CO and 150ppm NO with a logarithmic dependence of the EMF on the NH3 concentration.
Bibliography:http://dx.doi.org/10.1016/j.snb.2012.09.009
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2012.09.009