Humidity-resistant ambient-temperature solid-electrolyte amperom

Details Humidity-resistant ambient-temperature solid-electrolyte amperom Humidity-resistant ambient-temperature solid-electrolyte amperom

1991-01-31

1994-06-21

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415314, 2041532, 204421, G01N 27407

Patent

active

053226119

ABSTRACT:
Apparatus and methods for detecting selected chemical compounds in air or other gas streams at room or ambient temperature includes a liquid-free humidity-resistant amperometric sensor comprising a sensing electrode and a counter and reference electrode separated by a solid electrolyte. The sensing electrode preferably contains a noble metal, such as Pt black. The electrolyte is water-free, non-hygroscopic, and substantially water-insoluble, and has a room temperature ionic conductivity .gtoreq.10.sup.-4 (ohm-cm).sup.-1, and preferably .gtoreq.0.01 (ohm-cm).sup.-1. The conductivity may be due predominantly to Ag+ ions, as in Ag.sub.2 WO.sub.4.4AgI, or to F- ions, as in Ce.sub.0.95 Ca.sub.0.05 F.sub.2.95. Electrical contacts serve to connect the electrodes to potentiostating and detecting circuitry which controls the potential of the sensing electrode relative to the reference electrode, detects the signal generated by the sensor, and indicates the detected signal.

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