An improved type of proton conductor sensor sensitive to H2 and CO at room temperature
The use of an Ag reference electrode inert to H2 in air made it possible to fabricate a miniaturized proton conductor sensor element which did not necessitate separation of the sample gas from the reference gas (air). The sensor element was as small as 4 mm (diameter) × 8 mm (length) and showed both high sensitivity and fast response to small amounts of H2 or CO in air, with satisfactory stability for a period of about one month.