Highly sensitive mixed-potential-type NO₂ sensor using porous double-layer YSZ substrate

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• 作者：Chengguo YinAuthor Vitae ; Yingzhou GuanAuthor Vitae ; Zhe ZhuAuthor Vitae ; Xishuang Liang ; ^{liangxs@jlu.edu.cn}Author Vitae ; Biao WangAuthor Vitae ; Quan DiaoAuthor Vitae ; Han ZhangAuthor Vitae ; Jian MaAuthor Vitae ; Fengmin LiuAuthor Vitae ; Yanfeng SunAuthor Vitae ; Jie ZhengAuthor Vitae ; Geyu Lu ; ^{lugy@jlu.edu.cn}Author Vitae
• 关键词：YSZ ; Mixed-potential ; NO2 sensor ; Three-phase boundary ; Tape-casting ; Pore-forming
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：5 July, 2013
• 年：2013
• 卷：183
• 期：Complete
• 页码：474-477
• 全文大小：1321 K

文摘

In this article, the NO₂ sensing performance of the mixed-potential-type yttria stabilized zirconia (YSZ)-based sensor was improved by modifying the three-phase boundary (TPB). The double-tape casting and the pore-forming method were simultaneously used to obtain the porous YSZ-substrate. Furthermore, a group of tape-casting slurries with different starch concentrations (0 wt % , 5 wt % , 10 wt % and 15 wt % ) were applied to form the different contact areas of the three-phase boundary (TPB). The scanning electron microscope (SEM) images showed that YSZ-substrate prepared by using the slurry with 15 wt % starch had the largest contact area. The sensor based on the YSZ-substrate with the largest contact areas and the MnCr₂O₄ sensing electrode (SE) showed the largest response compared with the other sensors when they were exposed to 10-500 ppm NO₂ at 800 ¡ãC. The measured polarization (I-V) curves indicated that the present sensors operated under the mixed-potential mechanism. In addition, the sensor showed a good selectivity and repeatability to NO₂.