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

Patent · Tue Jun 21 00:00:00 EDT 1994

OSTI ID:7035337

Zaromb, S

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 [>=]10[sup [minus]4] (ohm-cm)[sup [minus]1], and preferably [>=]0.01 (ohm-cm)[sup [minus]1]. The conductivity may be due predominantly to Ag[sup +] ions, as in Ag[sub 2]WO[sub 4], or to F[sup [minus]] 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. 4 figs.

• DOE Contract Number: W-31109-ENG-38
• Assignee: PTO; EDB-94-103683
• Patent Number(s): US 5322611; A
• Application Number: PPN: US 7-648649
• OSTI ID: 7035337
• Resource Relation: Patent File Date: 31 Jan 1991
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
01 COAL, LIGNITE, AND PEAT
AIR POLLUTION MONITORS
DESIGN
POLLUTANTS
AMPEROMETRY
CALCIUM FLUORIDES
CERIUM FLUORIDES
GASES
OPERATION
PLATINUM
SILVER TUNGSTATES
SOLID ELECTROLYTES
US BUREAU OF MINES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CERIUM COMPOUNDS
ELECTROLYTES
ELEMENTS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MEASURING INSTRUMENTS
METALS
MONITORS
NATIONAL ORGANIZATIONS
PLATINUM METALS
RARE EARTH COMPOUNDS
SILVER COMPOUNDS
TITRATION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTATES
US DOI
US ORGANIZATIONS
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
012033 - Coal
Lignite
& Peat- Underground Mining- Mine Environment- (1987-)