Characteristics and modeling of a solid state hydrogen sensor

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2054749· OSTI ID:7237399

Tan, Y; Tan, T C ^[1]

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1. National Univ. of Singapore (Singapore). Dept. of Chemical Engineering

A potentiometric hydrogen sensor was fabricated by covering one of the planar platinum electrodes on a solid yttria stabilized zirconia electrolyte with an oxide catalyst mixture containing CuO/ZnO/Al[sub 2]O[sub 3] in the molar ratio of 7:10:3. A mathematical model was developed to describe the sensing mechanism and operating characteristics of the sensor, incorporating the faradaic reactions and other rate processes including diffusion, adsorption, and catalytic reaction in the oxide layer. Good response characteristics and sensitivity were obtained over the temperature range of 688 to 773 K for air-hydrogen mixture containing 0 to 0.145% of hydrogen by volume. The sensor response over the concentration range of 0 to 0.0145% of hydrogen in air was satisfactorily described by the model assuming ideal Langmuir adsorption characteristics of homogeneous active sites. However, for the complete concentration range of 0 to 0.145% of hydrogen, the experimental data were better described by the model when nonideal adsorption and heterogeneous active sites are assumed.

• OSTI ID: 7237399
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:2; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080800* -- Hydrogen-- Properties & Composition
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
COMBUSTION PROPERTIES
CONCENTRATION RATIO
DESIGN
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTROLYTES
ELEMENTS
EQUIPMENT
FLAMMABILITY
HYDROGEN
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MONITORING
NONMETALS
POTENTIOMETERS
POTENTIOMETRY
SOLID ELECTROLYTES
TITRATION