Ammonia sensor based on NASICON and Cr₂O₃ electrode

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• 作者：Xishuang Liang ; Tiegang Zhong ; Hesong Guan ; Fengmin Liu ; Geyu Lu ; Baofu Quan
• 关键词：NH₃ ; NASICON ; Cr₂O₃ ; Gas sensor
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2009
• 出版时间：2 March 2009
• 年：2009
• 卷：136
• 期：2
• 页码：479-483
• 全文大小：1091 K

文摘

A compact tubular sensor based on NASICON (sodium super ionic conductor) and porous Cr₂O₃ sensing electrode was designed for the detection of ammonia. The sensor gave excellent sensing properties to 50–500 ppm ammonia in air at 250–450 °C. The EMF value of the sensor was almost proportional to the logarithm of ammonia concentration, the sensitivity (slope) was −89 mV/decade at 350 °C. It was also seen that the sensor showed a good selectivity to ammonia, and an excellent resistance to water vapor. The sensor had speedy response kinetics to ammonia, the 90 % response time to 50 ppm ammonia was 30 s, and the recovery time was 60 s.