Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 161, Issue 1, Pages 471-479Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.10.063
Keywords
Zirconia; O-2 sensor; VOCs sensor; EMF; Adsorption
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The response of the electrode potential to several volatile organic compounds was examined for a concentration cell-type oxygen sensor with a Pt|8YSZ|Pt (ref. 21% oxygen) structure. The contamination of air with ppm levels of volatile organic compounds resulted a decrease in the oxide activity at the sensing electrode with a Pt layer, i.e., a decrease in the half-cell potential. The decrease of the potential at the Pt sensing electrode was modified with an over-coating of the Pt electrode with a second material. The formation of a dense Au layer on the Pt electrode was effectively decreased the half-cell potential with the VOCs. On the other hand, the over-coating of the Pt electrode with materials having a high catalytic activity of volatile organic compounds oxidation depressed the sensitivity to the volatile organic compounds. (C) 2011 Elsevier B.V. All rights reserved.
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