基于LSCF/SDC-BZCYYb极限电流氧传感器的研究

Research of Limiting Current Oxygen Sensor Based on LSCF/SDC-BZCYYb

采用甘氨酸—硝酸盐法制备La0.8Sr0.2Co0.8Fe0.2O3-δ(LSCF)混合导体致密扩散障碍层材料。采用溶胶凝胶-低温燃烧法制备Ce0.8Sm0.2O1.9(SDC)固体电解质材料和电子阻碍材料Ba Zr0.1Ce0.7Y0.1Yb0.1O3-δ(BZCYYb)。用Pt浆粘合LSCF陶瓷与SDC-BZCYYb陶瓷,来制备致密扩散障碍层极限电流型氧传感器,对该氧传感器进行氧敏性能测试。测试结果表明:以LSCF做为致密扩散障碍层、SDC做为固体电解质的致密扩散障碍层极限电流型氧传感器在引入电子阻碍材料BZCYYb后,在700℃温度下,氧体积分数为0~21%范围内,均获得良好的极限电流平台,极限电流最大值达25 m A,出现极限电流平台的电压为0.5 V^1.7 V,极限电流与氧体积分数呈良好的线性关系,响应时间约5 s^10 s;测量误差约为±1%。研究结果为该传感器的实际应用提供了理论与实验依据。

A dense diffusion barrier limiting current oxygen sensor with Ce0.8 Sm0.2O1.9 （SDC） solid electrolyte and La0. 8 Sr0.2 Co0. 8 Fe0.2O3 （LSCF） dense diffusion barrier and BaZr0.1Ce0. 7 Y0.1 Yb0. 1O3 - δ （BZCYYb） electronic block material was developed. Effects of oxygen concentration and temperature on the limiting current were investigated and the response time of the oxygen sensor was measured. The limiting current oxygen sensor exhibited a good limiting current platform when the oxygen volume fraction is between 0 and 0.21. The limiting current linearly increased with the oxygen volume fraction. At 700℃, it improved from 5mA to 25mA as the oxygen volume fraction increased from O. 038 to 0.21. In addition, the limiting current ox- ygen sensor showed a wide voltage platform interval, which is from O. 5 V to 1.4 V. The response time of the sensors was a- bout 5 s - 10 s. The measurement error was about ± 1%. These results provided a potential approach to improvement in the limiting current oxv,,en sensor for practice use.