G - Physics
01
N
324/25.5
G01N 27/30 (2006.01) G01N 27/49 (2006.01)
Patent
CA 1150356
ABSTRACT OF THE DISCLOSURE This specification generally discloses electro- chemical cell for use in a gas detector unit, and more particularly, a cell for sensing reducible gases including, for example, NO2, Cl2, O3, ClO2 and O2. This is achieved by the use of gold as the sensing electrode in combination with a material selected from the group of iridium and ruthenium as the counterelectrode, and preferably iridium. For three electrode sensors wherein a reference electrode is utilized, preferably the material will be selected which is similar to the counterelectrode material. However, the material may be selected from platinum, iridium and ruthenium. The effect of this combination of materials utilized in the electrodes of the sensor of the invention is a more stable continuously operating cell, not subject to the usual degradation of prior art cells. Thus there is disclosed an electrochemical sensor for the detection of electrochemically reducible gases comprising (a) an electrolyte; (b) a sensing electrode in contact with said electrolyte; and (c) a counterelectrode in contact with said electrolyte. Said sensing electrode is comprised of gold on a porous hydrophobic membrane; and said counterelectrode is a member selected from the group consist- ing of iridium and ruthenium.
379218
Cromer Raymond B.
Stetter Joseph R.
Becton Dickinson And Company
Gowling Lafleur Henderson Llp
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