Potentiometric Oxygen Sensor Operable in Low Temperature by Applying LaGaO3‐Based Oxide for Electrolyte
| Autor: | Hiroyasu Nishiguchi, Tatsumi Ishihara, Yusaku Takita, Masakazu Higuchi, Tomokatsu Fukushima, Haruyoshi Furutani |
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| Rok vydání: | 1997 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Inorganic chemistry Analytical chemistry Oxide Partial pressure Electrolyte Conductivity Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion selective electrode symbols.namesake chemistry.chemical_compound chemistry Materials Chemistry Electrochemistry symbols Fast ion conductor Nernst equation Oxygen sensor |
| Zdroj: | Journal of The Electrochemical Society. 144:L122-L125 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.1837632 |
| Popis: | Oxygen sensors are important for combustion control, in particular, for vehicles. A perovskite-type oxide of LaGaO{sub 3} 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 LaGaO{sub 3}-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 Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} electrolyte is used, an operating temperature as low as 600 K is adequate when La{sub 1{minus}x}Sr{sub x}Ga{sub 0.8}Mg{sub 0.2}O{sub 3} 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 LaGaO{sub 3}-based oxide was used. Moreover, 90% of the response was attained within 15 s at 673 K for the sensor with Nd-doped LaGaO{sub 3}-based oxide. |
| Databáze: | OpenAIRE |
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