A GdAlO(3) Perovskite Oxide Electrolyte-Based NO(x) Solid-State Sensor.
A GdAlO(3) Perovskite Oxide Electrolyte-Based NO(x) Solid-State Sensor.
复制标题
基于 GdAlO3 钙钛矿氧化物电解质的 NOx 固态传感器
DOI：
10.1038/srep37795
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发表时间：
2016-11-25
影响因子：
4.6
通讯作者：
Zhong F
中科院分区：
文献类型：
--
作者：
Xiao Y;Wang D;Cai G;Zheng Y;Zhong F
氮氧化物是机动车和化工厂排放的一种臭名昭著的排放物，是酸雨和光化学烟雾的前身。虽然目前已经开发出基于氧化锆的NOx传感器，并在800℃以上的高温下表现出较高的灵敏度和选择性，但其性能表现不佳，甚至不能在汽车发动机的典型工作温度窗（500℃）下工作。发展温控型氮氧化物探测器或传感器仍然是一个艰巨的挑战。本文以钙钛矿型氧化物Gd1−xCaxAlO3−δ(GCA)为电解液，NiO为传感电极，研制了一种新型的安培型固态NOx传感器。研究了该器件在400 ~ 500℃温度范围内的NOx传感性能。- 300 mV时的响应电流值与500℃下300 ~ 500 ppm的NOx浓度几乎成线性关系。在此温度下，优化后的传感器NO2灵敏度最高，为20.15 nA/ppm，最大响应电流值达到5.57 μA。对500ppm NO2的90%响应时间约为119 s， 90%恢复时间约为92 s。优异的选择性和稳定性显示了该传感器在汽车上的潜在应用。
NOx is a notorious emission from motor vehicles and chemical factories as the precursor of acid rain and photochemical smog. Although zirconia-based NOx sensors have been developed and showed high sensitivity and selectivity at a high temperature of above 800 °C, they fail to show good performance, and even don’t work at the typical work temperature window of the automotive engine (500 °C). It still is a formidable challenge for development of mild-temperature NOx detector or sensor. Herein, a novel amperometric solid-state NOx sensor was developed using perovskite-type oxide Gd1−xCaxAlO3−δ(GCA) as the electrolyte and NiO as the sensing electrode. NOx sensing properties of the device were investigated at the temperature region of 400–500 °C. The response current value at −300 mV was almost linearly proportional to the NOx concentration between 300 and 500 ppm at 500 °C. At such a temperature, the optimal sensor gave the highest NO2 sensitivity of 20.15 nA/ppm, and the maximum response current value reached 5.57 μA. Furthermore, a 90% response and 90% recover time to 500 ppm NO2 were about 119 and 92 s, respectively. The excellent selectivity and stability towards NOx sensing showed the potential application of the sensor in motor vehicles.
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