YSZ-based NO₂ sensor utilizing hierarchical In₂O₃ electrode

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• 作者：Fangmeng Liu^aAuthor Vitae ; Yehui Guan^aAuthor Vitae ; Hongbin Sun^aAuthor Vitae ; Xiumei Xu^bAuthor Vitae ; Ruize Sun^aAuthor Vitae ; Xishuang Liang^a ; ^{liangxs@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Peng Sun^aAuthor Vitae ; Yuan Gao^aAuthor Vitae ; Geyu Lu^a ; ^{lugy@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：NO2 sensor ; YSZ ; Mixed-potential ; Hierarchical-In2O3
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：222
• 期：Complete
• 页码：698-706
• 全文大小：2929 K

文摘

Mixed-potential type YSZ-based sensor utilizing In₂O₃ as sensing electrode (SE) was fabricated and examined for detection of NO₂ at 700 °C. The hierarchical In₂O₃ oxide material was synthesized via a facile hydrothermal process, and In₂O₃ sintered at different temperatures were characterized using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The present study mainly focused on the effect of sintering temperature of SE materials (800 °C, 1000 °C, 1200 °C) on NO₂ sensing characteristics. As a result, the sensor attached with In₂O₃-SE calcined at 1000 °C exhibited the largest sensitivity to NO₂, which the response to 100 ppm NO₂ was as large as126 mV and excellent long-term stability for 30 days tested at 700 °C. It is noteworthy that the NO₂ sensitivities for present device showed a small influence by the change of relative humidity at 700 °C. Additionally, the present devices also displayed good repeatability, the excellent sensitivity and relatively good selectivity in conjunction with various interfering gases before and after 30 days high-temperature-aging of 700 °C. It was speculated that the largest sensing performance for the sensor attached with In₂O₃-SE sintered at 1000 °C was contributed to the special micro-structure of the SE and the highest electrochemical catalytic activity for cathodic reaction of NO₂ at the triple phase boundary (TPB).