Abstract
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.
Original language | English |
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Pages (from-to) | L122-L125 |
Journal | Journal of the Electrochemical Society |
Volume | 144 |
Issue number | 5 |
DOIs | |
Publication status | Published - May 1997 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Electrochemistry
- Materials Chemistry