Solid oxide amperometric CO sensor for monitoring exhaust gas from water heater

Tatsumi Ishihara, Phawachalotorn Armonat, Rie Kadowaki, Oravan Sanguanruang

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)183-192
    Number of pages10
    JournalSensors and Materials
    Issue number4
    Publication statusPublished - 2010

    All Science Journal Classification (ASJC) codes

    • Instrumentation
    • General Materials Science


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