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Sensors and Materials, Volume 22, Number 4 (2010)
Copyright(C) MYU K.K.

pp. 183-192
S&M800 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2010.642
Published: June 10, 2010

Solid Oxide Amperometric CO Sensor for Monitoring Exhaust Gas from Water Heater [PDF]

Tatsumi Ishihara, Phawachalotorn Armonat, Rie Kadowaki and Oravan Sanguanruang

(Received October 16, 2009; Accepted April 13, 2010)

Keywords: amperometric sensor, CO sensor, LaGaO3 electrolyte

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%)/In1.9Sn0.1O3 and RuO2(10 wt%)/La0.6Sr0.4CoO3 as the electrode catalysts and La0.9Sr0.1Ga0.8Mg0.2O3 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 LaGaO3 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.

Corresponding author: Tatsumi Ishihara

Cite this article
Tatsumi Ishihara, Phawachalotorn Armonat, Rie Kadowaki and Oravan Sanguanruang, Solid Oxide Amperometric CO Sensor for Monitoring Exhaust Gas from Water Heater, Sens. Mater., Vol. 22, No. 4, 2010, p. 183-192.