A study of optimization of sensor electrodes for inproving NOx response properties

研究了一种电流型氧化锆基氮氧化物传感器的传感电极的改进。为了提高对NOx的响应，采用旋涂技术，在含有La(NO3)3、Sr(OC3H7)2、Mn(CH3COO)2.4H2O的2-甲氧基乙醇溶液中，混合乙醇胺和乙酸乙酯，在氧化锆衬底上制备了致密、薄的La0.8Sr0.2MnO3传感电极。通过对传感器电极组成和制备方法的优化，还发现在La0.8Sr0.2MnO_3中用Al取代Mn提高了传感器在高温还原气氛中的稳定性，并且具有较高的稳定性和响应性。

Improvements of sensing electrode of an amperometric-type zirconia-based NOx sensor were examined. As a result of investigation for making a thin-dense sensing electrode in order to enhance the NOx response, dense and thin electrodes of La0.8Sr0.2MnO3 on zirconia substrate were obtained by spin coating technique using 2-methoxyethanol solution containing La(NO3)3, Sr(OC3H7)2, Mn(CH3COO)2.4H2O mixed with ethanolamine and acetoine. It was also found that substitution of Mn with Al in La0.8Sr0.2MnO3 improves the stability in high-temperature reduction atmosphere, and the sensor shows high stability and response by optimization of composition and preparation method of the sensor electrode.