Potentiometric oxygen sensor operable in low temperature by applying LaGaO3-based oxide for electrolyte
Potentiometric oxygen sensor operable in low temperature by applying LaGaO3-based oxide for electrolyte
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DOI：
10.1149/1.1837632
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发表时间：
1997-05-01
影响因子：
3.9
通讯作者：
Takita, Y
中科院分区：
文献类型：
--
作者：
Ishihara, T;Higuchi, M;Takita, Y
钙钛矿型掺杂Sr和Mg的LaGaO3氧化物在较宽的氧分压范围内表现出较高的氧化物离子电导率。本文研究了lagao3基氧化物作为电位式氧传感器电解质的应用。结果表明，银是降低操作温度最有效的电极。虽然使用传统的y2o3稳定的ZrO2电解质需要高于800 K的温度，但当使用X = 0.1和0.2的La1-xSrxGa0.8Mg0.2O3时，工作温度低至600 K就足够了。开路电位略小于用能斯特方程估计的电势。当使用掺钕lagao3基氧化物时，在673 K范围内与能斯特方程一致；此外，在673 K下，掺钕lagao3基氧化物的传感器在15 s内达到90%的响应。
A perovskite-type oxide of LaGaO3 doped with Sr and Mg exhibits a high oxide ion conductivity over a wide range of oxygen partial pressures. In this study, the application of LaGaO3-based oxide as the electrolyte of a potentiometric oxygen sensor was investigated. It became clear that silver is the most effective electrode for decreasing the operating temperature. Although a temperature higher than 800 K is required when a conventional Y2O3-stabilized ZrO2 electrolyte is used, an operating temperature as low as 600 K is adequate when La1-xSrxGa0.8Mg0.2O3 at X = 0.1 and 0.2 is used. The open-circuit potential was slightly smaller than that estimated with the Nernst equation. There was agreement with the Nernst equation down to 673 K when Nd-doped LaGaO3-based oxide was used; Moreover, 90% of the response was attained within 15 s at 673 K for the sensor with Nd-doped LaGaO3-based oxide.