NO2 sensing properties of YSZ-based sensor using NiO and Cr-doped NiO sensing electrodes at high temperature
NO2 sensing properties of YSZ-based sensor using NiO and Cr-doped NiO sensing electrodes at high temperature
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DOI：
10.1007/s11581-009-0354-0
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发表时间：
2009-08-01
期刊：
影响因子：
2.8
通讯作者：
Miura, Norio
中科院分区：
文献类型：
--
作者：
Elumalai, Perumal;Zosel, Jens;Miura, Norio
通过硝酸盐热分解制备了氧化镍和掺铬氧化镍（Ni0.95Cr0.03O1-delta）。将获得的NiO和Ni0.95Cr0.03O1-δ样品用作基于氧化钇稳定的氧化锆（YSZ）的传感器中的感测电极（SE），用于在800 A ℃下在湿条件（5体积%）下检测NO2 H2O）。而与NiO-SE连接的混合电位型平面传感器给出了相当大的NO2灵敏度，与Ni 0.95Cr 0.03O1-delta -SE连接的传感器表现出快速的恢复速率，具有可接受的灵敏度。传感器的Δ电动势（电动势）在对数尺度上在50-400 ppm的检查范围内随NO2浓度线性变化。根据极化曲线、复阻抗曲线和气相催化曲线的测量结果，快速恢复是由于O-2在Ni 0.95Cr 0.03O1-delta /YSZ界面上的高阳极反应速率，而较低的NO2灵敏度则是由于O-2的高阳极反应速率和NO2向NO的气相转化程度。
Nickel oxide and chromium-doped nickel oxide (Ni0.95Cr0.03O1-delta ) were prepared by thermal decomposition of nitrates. The obtained NiO and Ni0.95Cr0.03O1-delta samples were utilized as sensing electrodes (SEs) in yttria-stabilized zirconia (YSZ)-based sensors for detection of NO2 at 800 A degrees C under wet condition (5 vol.% H2O). While the mixed-potential-type planar sensor attached with NiO-SE gave rather large NO2 sensitivity, the sensor attached with Ni0.95Cr0.03O1-delta -SE exhibited fast recovery rate with an acceptable sensitivity. The Delta emf (electromotive force) of the sensors varied linearly with NO2 concentration in the examined range of 50-400 ppm on a logarithmic scale. Based on the results of measurements for polarization, complex impedance and gas phase catalysis, the fast recovery was attributable to the high rate for the anodic reaction of O-2 at the Ni0.95Cr0.03O1-delta /YSZ interface, and the lower NO2 sensitivity was caused by both the high rate for the anodic reaction of O-2 and the high degree for the gas phase conversion of NO2 to NO.