An electrochemical gas sensor cell is provided, the use of
which permits quantitative measurement of volatile gas contaminants in an
atmosphere being monitored. The cell comprises at least a first sensor
electrode and a second counter electrode, on either side of an ion conductive
electrolyte which may be immobilized in a matrix.
The electrolyte may also be a solid electrolyte or a polymer
electrolyte. The sensing electrode has a high surface area catalyst dispersed
on a porous substrate, and is mounted in such a manner as to be exposed to the
atmosphere which is to be sensed for gaseous contaminants, with the counter
electrode being isolated from any exposure to that atmosphere. Generally, the
electrodes are mounted in electrically conductive frames, sandwiching a third
non-conductive frame member in which the ion conductive electrolyte is
substantially located.
The conductive frames may comprise electronically conductive
materials such as conductive polymers, ceramics, nitrides, oxides and
graphites. In an alternative embodiment, a further reference electrode may be
mounted so as to be exposed to the electrolyte. The porous electrode may
comprise a porous substrate or a base layer, a catalytically active metal,
alloy, or metal oxide (usually a noble metal) dispersed in a high surface area
form, carbon, and a polymeric hydrophobic binder.
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