An impedancemetric NH sensor was prepared using Yttria-stabilized zirconia (YSZ) as the solid electrolyte and Ag nanoparticle decorated NiFeO (NiFeO/Ag) prepared by electrochemical exsolution as the sensing electrode (SE). The feasibility of electrochemical exsolution was confirmed by XRD and TEM characterization. After a voltage of −2 V was applied across the sensor based on NiFeAgO for 1000 s, a large number of Ag nanoparticles as the second phase appear on the surface of the NiFeO particles and attached to the matrix. The effects of exsolution time, temperature, and voltage on the sensing performance of the sensor were investigated. After electrochemical exsolution, the response value and sensitivity of the sensor are significantly improved compared to the sensor before exsolution and the limit of detection (LOD) of the sensor is reduced from 50 ppm to 10 ppm at 500 °C. In addition, the reproducibility of the electrochemical exsolution is good, and the sensor exhibits good stability. More importantly, the immunity of the sensor to NO is significantly improved using the electrochemical exsolution SE.

中文翻译：

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电化学溶出法制备的基于Ag纳米粒子修饰NiFe2O4传感电极的阻抗NH3传感器

以氧化钇稳定氧化锆（YSZ）为固体电解质，以电化学溶出法制备的银纳米粒子修饰的NiFeO（NiFeO/Ag）为传感电极（SE），制备了阻抗NH传感器。通过 XRD 和 TEM 表征证实了电化学溶出的可行性。在基于NiFeAgO的传感器上施加-2 V的电压1000 s后，大量Ag纳米颗粒作为第二相出现在NiFeO颗粒的表面并附着在基体上。研究了溶解时间、温度和电压对传感器传感性能的影响。电化学脱溶后，传感器的响应值和灵敏度较脱溶前显着提高，并且传感器的检测限（LOD）在500℃时从50 ppm降低到10 ppm。此外，电化学溶出的重现性良好，传感器表现出良好的稳定性。更重要的是，使用电化学 exsolution SE 显着提高了传感器对 NO 的抗扰度。