High-temperature carbon monoxide potentiometric sensor

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2056199· OSTI ID:6532725

Li, N; Tan, T C; Zeng, H C ^[1]

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1. National Univ. of Singapore (Singapore)

These sensors have been used in industrial alarm and control systems for monitoring and control of the oxygen concentration in a gas stream and for the control of air-fuel ratio in internal combustion engines as in automobiles. A high-temperature potentiometric CO sensor was developed by coating a mixture of CuO/ZnO over one of the platinum electrodes of a cell with a yttria-stabilized zirconia solid electrolyte. It showed good CO sensing characteristics over the temperature range of 450-550 C and concentration range of 0-10,000 ppm of CO in air. In particular, high sensitivity coupled with reasonably fast response and baseline recovery characteristics were observed at 450 C for CO concentration below 3,000 ppm. The sensing mechanism and operating system were adequately described by a proposed mathematical model. The model relates the induced cell EMF to the various rate phenomena occurring in the oxide layer such as diffusion, adsorption, and surface catalytic oxidation of the adsorbed carbon monoxide by the gaseous oxygen.

• OSTI ID: 6532725
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:4; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330702 -- Emission Control-- Carbon Monoxide
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ADSORPTION
ALARM SYSTEMS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL SYSTEMS
COPPER COMPOUNDS
COPPER OXIDES
DIFFUSION
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLYTES
ELEMENTS
ENGINES
FUEL-AIR RATIO
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METALS
MONITORING
MONITORS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
PLATINUM
PLATINUM METALS
POTENTIOMETRY
SOLID ELECTROLYTES
SORPTION
TITRATION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
USES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZINC COMPOUNDS
ZINC OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES