Mathematical modeling of a solid-state limiting current carbon monoxide sensor

Journal Article · Fri Mar 01 04:00:00 EST 1996 · AIChE Journal

DOI:https://doi.org/10.1002/aic.690420325· OSTI ID:218617

Tan, Y; Tan, T C ^[1]

---

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

A solid-state carbon monoxide sensor was fabricated using a 9% yttria-stabilized zirconia (YSZ) disc sandwiched between two platinum thin-film electrodes. One of the electrodes was coated with a thin layer of 7 CuO/10 ZnO/3 Al{sub 2}O{sub 3} catalyst. The sensor showed limiting current behavior at an applied voltage between 0.5 and 1.2 V. Linear response was observed with carbon monoxide in a nitrogen--oxygen mixture at high temperature and limiting current conditions. The linear carbon monoxide concentration range increased with increase in the operating temperature and its sensitivity increased from 2.437 mA/atm CO at 1,023 K to 10.771 at 1,093 K. These characteristics were adequately described by the proposed mathematical model relating the response to the rate processes occurring in the catalyst layer and in the electrochemical cell under limiting current conditions. The model showed that effective sensing and high sensitivity are best obtained using a catalyst with high catalytic activity toward the test solute and proper design and fabrication of the sensor to ensure its high diffusivity in the catalyst.

• OSTI ID: 218617
• Journal Information: AIChE Journal, Journal Name: AIChE Journal Journal Issue: 3 Vol. 42; ISSN 0001-1541; ISSN AICEAC
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORING
AIR POLLUTION MONITORS
ALUMINIUM OXIDES
CARBON MONOXIDE
CATALYTIC EFFECTS
COPPER OXIDES
MATHEMATICAL MODELS
PERFORMANCE
RESPONSE FUNCTIONS
YTTRIUM OXIDES
ZINC OXIDES
ZIRCONIUM OXIDES