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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。
La0.8Sr0.2Co0.8Fe0.2O3-δ (LSCF) mixed conductor dense diffusion barrier material was prepared by glycine-nitrate method. Ce0.8Sm0.2O1.9 (SDC) solid electrolyte material and electron blocking material Ba Zr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) were prepared by sol-gel-low temperature combustion method. LSCF ceramic and SDC-BZCYYb ceramic were bonded with Pt paste to prepare a dense diffusion barrier current limiting oxygen sensor, and the oxygen sensor was tested for oxygen sensitivity. The test results show that the oxygen diffusion rate limit of Oxygen sensor with LSCF as the dense diffusion barrier layer and SDC as the solid electrolyte is 0 ~ 21% at 700 ℃ after introducing the electron blocking material BZCYYb. , The maximum current limit is 25 m A, the limit current is 0.5 V ~ 1.7 V, the limit current has a good linear relationship with the oxygen volume fraction, and the response time is about 5 s ~ 10 s; measurement error is about ± 1%. The results provide the theoretical and experimental basis for the practical application of the sensor.