title: A GdAlO3Perovskite Oxide Electrolyte-Based NOxSolid-State Sensor.
abstract: NOxis a notorious emission from motor vehicles and chemical factories as the precursor of acid rain and photochemical smog. Although zirconia-based NOxsensors 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 NOxdetector or sensor. Herein, a novel amperometric solid-state NOxsensor was developed using perovskite-type oxide Gd1-xCaxAlO3-δ(GCA) as the electrolyte and NiO as the sensing electrode. NOxsensing 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 NOxconcentration between 300 and 500 ppm at 500 °C. At such a temperature, the optimal sensor gave the highest NO2sensitivity 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 NO2were about 119 and 92 s, respectively. The excellent selectivity and stability towards NOxsensing showed the potential application of the sensor in motor vehicles.
authors.affiliation: National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou 350002, Fujian, P. R. China.
authors.forename: Yihong
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou 350002, Fujian, P. R. China.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Wang
authors.affiliation: National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou 350002, Fujian, P. R. China.
authors.forename: Guohui
authors.initials: G
authors.lastname: Cai
authors.affiliation: National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou 350002, Fujian, P. R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou 350002, Fujian, P. R. China.
authors.forename: Fulan
authors.initials: F
authors.lastname: Zhong