Abstract
An amperometric proton-conductor CO sensor operative at room temperature was developed by using a couple of Pt-loaded oxide (SnO 2 and WO 3) electrodes. The CO sensitivity of this sensor was about 7 times higher than the H 2 sensitivity and the 90% response time about 3 min. On the other hand, the sensor became H 2-selective when a Pt-black electrode was combined with a Pt-loaded WO 3 electrode. The sensing mechanisms of the CO- and H 2-selective proton-conductor sensors are proposed.
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