Humidity-resistant ambient-temperature solid-electrolyte amperometric sensing apparatus and methods

Patent · Sun Dec 31 23:00:00 EST 2000

OSTI ID:873747

Zaromb, Solomon ^[1]

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1. 9 S 706 William Dr., Hinsdale, IL 60521

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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• Assignee: Zaromb, Solomon (9 S 706 William Dr., Hinsdale, IL 60521)
• Patent Number(s): US 6235173
• OSTI ID: 873747
• Country of Publication: United States
• Language: English

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air
ambient
ambient temperature
ambient-temperature
ambient-temperature solid-electrolyte
amperometric
amperometric sensing
apparatus
black
chemical
chemical compound
chemical compounds
circuitry
compounds
comprising
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contains
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counter
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electrode
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electrode separated
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electrolyte
f-
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gas streams
generated
gtoreq
humidity-resistant
humidity-resistant ambient-temperature
indicates
ionic
ionic conductivity
liquid-free
liquid-free humidity-resistant
metal
methods
noble
noble metal
non-hygroscopic
ohm-cm
potential
potentiostating
predominantly
preferably
preferably contain
preferably contains
reference
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relative
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selected chemical
sensing
sensing apparatus
sensing electrode
sensor
sensor comprising
separated
serve
signal
signal generated
solid
solid electrolyte
solid-electrolyte
solid-electrolyte amperometric
streams
substantially
substantially water-insoluble
temperature
temperature solid
water-free
water-insoluble