Mixed potential NH₃ sensor with LaCoO₃ reference electrode

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• 作者：Ingun Lee^a ; ^{iklee@kaist.ac.kr}Author Vitae ; Byounghyo Jung^a ; ^{Thirdeye00@kaist.ac.kr}Author Vitae ; Jinsu Park^a ; ^{eau4@kaist.ac.kr}Author Vitae ; Chunbum Lee^b ; ^{cblee@katech.re.kr}Author Vitae ; Jeongsug Hwang^c ; ^{hjs422@dragon.taejon.ac.kr}Author Vitae ; C.O. Park^a ; ^{cops@kaist.ac.kr}Author Vitae
• 关键词：NH3 sensor ; In2O3 ; LaCoO3 ; Reference electrode
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：176
• 期：Complete
• 页码：966-970
• 全文大小：631 K

文摘

Mixed potential NH₃ sensors using an yttria stabilized zirconia (YSZ, 8 mol % Y₂O₃) electrolyte were prepared and evaluated at 700 ¡ãC. 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 150 ppm 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 150 ppm NO₂ was reduced from 50 % to 10 % . The EMF showed little change upon exposure to 1000 ppm CO and 150 ppm NO with a logarithmic dependence of the EMF on the NH₃ concentration.