ELECTROCHEMICAL GAS SENSOR COMPRISING AN ANION-EXCHANGE MEMBRANE

摘要

The present invention is directed to electrochemical gas sensors for the detection of combustible, flammable or toxic gases and to catalyst-coated membranes (CCMs) used therein. The gas sensor comprises at least one solid anion exchange membrane (AEM), a sensing electrode and a counter electrode. The sensing electrode comprises catalytically active material and anionic ionomer material, the weight ratio between the catalyst material and the anionic ionomer material in the sensing electrode is in the range of 3/1 to 99/1, preferably in the range of 4/1 to 30/1.;Due to the use of anion exchange ionomer materials, the sensor can be made less expensive and suitable for high volume production. When applied for the detection of CO, the sensor shows good CO selectivity S(CO/H2) in the presence of hydrogen.

主权项

1. Electrochemical gas sensor for the detection of combustible, flammable or toxic gases, comprising at least one ionomer membrane, a sensing electrode and a counter electrode, wherein the ionomer membrane is a solid anion exchange membrane (AEM) and the sensing electrode and the counter electrode comprise catalytically active material and anionic ionomer material.