An amperometric CO sensor using a solid oxide electrolyte was studied and it was found that the oxygen pumping current increased with increasing CO concentration when using Au(10 wt%)/In1.9Sn0.1Sn 0.1O3 and RuO2(10 wt%)/La0.6Sr 0.4CoO3 as the electrode catalysts and La 0.9Sr0.1Ga0.8Mg0.2O3 as the electrolyte. Mixed potentials are also observed on this sensor upon exposure to CO, and so changes in oxygen pumping current may be caused by the mixed potentials formed upon exposure to CO. Substitution of Ga in the LaGaO 3 electrolyte with Fe is effective for increasing the sensitivity, and this sensor is almost insensitive to CO2 and CH4. As a result, it is expected that this sensor can be used for the detection of CO in exhaust gas from a small gas water heater without a flue line.
|Number of pages
|Sensors and Materials
|Published - 2010
All Science Journal Classification (ASJC) codes
- General Materials Science