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制备以Y2O3稳定的ZrO2(yttria stabilized zirconia,YSZ)为固体电解质、NiO为敏感电极的混合电势型NO传感器。用X射线衍射仪和扫描电镜对该传感器进行理化分析,测量其在不同高温和不同NO体积(下同)浓度的气氛中的响应电势,通过电化学阻抗谱分析法研究该传感器的高温阻抗谱特性。结果显示:在500～750℃,该传感器响应表现为与NO浓度的对数呈明显线性关系的负电势,电势幅值和灵敏度均随工作温度的升高而减小。在600℃,阻抗谱形成的半圆弧随NO浓度的增加呈规律性缩小。
A mixed potential NO sensor with Y2O3 stabilized zirconia (Yttria stabilized zirconia, YSZ) as the solid electrolyte and NiO as the sensitive electrode was prepared. The physical and chemical properties of the sensor were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The response potentials of the sensor in different high temperature and different NO concentrations were measured. The electrochemical impedance spectroscopy characteristic. The results show that at 500-750 ℃, the sensor response shows a negative linear relationship with the logarithm of NO concentration. The amplitude and the sensitivity of the sensor decrease with the increase of working temperature. At 600 ℃, the semicircular arc formed by impedance spectroscopy decreases regularly with the increase of NO concentration.