NO_x Sensing Performances of Mixed-Potential-Type Gas Sensor Based on Stabilized-Zirconia and La_5/3Sr_1/3NiO₄ Sensing Electrode

Abstract:

Abstract. This article attempts to use a new sensing electrode material _{La5/3Sr1/3NiO4} for mixed-potential-type NOx sensors as they are high ionic conductivity, close thermal expansion coefficients to electrolytes (YSZ), low-cost and stable even at above 1000 °C. The nanostructured La_5/3Sr_1/3NiO₄ was synthesized as a sensing electrode (SE) for the mixed-potential-type yttria stabilized zirconia (YSZ)-based NO sensor by a sol-gel method. The synthesized La_5/3Sr_1/3NiO₄ powders were characterized using XRD, BET and FESEM. The sensing characteristics were examined in the temperature range of 400-700 °C. At 450 °C, the sensor exhibited the biggest response (about 20.3 mV for 1000 ppm NO). Moreover, the sensor response and recovery were generally rapid at all the temperatures. This work demonstrated that the La_5/3Sr_1/3NiO₄ can be an effective sensing electrode candidate of mixed-potential-type NO sensors.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 841-844
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.841
• Online since: March 2014
• Authors: Ying Chen, Xiang Dong Li, Feng Xia, Jian Zhong Xiao*
• Keywords: La_5⁄3Sr_1⁄3NiO₄, Mixed-Potential-Type Gas Sensor, NO, Sol-Gel Method

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