Planar, impedance-metric NOx-sensor with spinel-type SE for high temperature applications

[摘要] This study displays the results obtained with planar, impedance-metric sensors having a NiCr2O4-sensing electrode (SE) and FYSZ or PYSZ (fully or partially yttria stabilised zirconia) electrolytes. The sensing electrodes of planar design sensors are fabricated by magnetron sputter technique. The evaluation of the microstructure and phase sequence of the sensing electrode is analysed. The sensing characteristics towards NO and O-2/NO-gas mixtures of the sensor samples are analysed at temperatures up to 700 degrees C by varying the NO concentration between 0 and 1000 ppm and by adding 5 vol.% of O-2. The cross-selectivity of the sensor samples to other flue-gases, such as CO2, CO and CH4 and the mixtures of those with 0, are also analysed. These analyses showed that the total impedance is a new and capable type of sensing parameter for the characterisation of NO-gas sensors. Thus, this study demonstrates the principal applicability of the impedance-metric sensor concept for the detection of NO, in lean atmospheres by applying the total impedance. The tested sensor samples are able to monitor NO up to 1000 ppm at 650 degrees C. (c) 2007 Elsevier B.V All rights reserved.

[发布日期] 2007-10-20

[效力级别]  Proceedings Paper

[关键词] mixed oxide-sensing electrode;high temperature flue-gas sensor;impedance-metric sensors;total impedance