Author:
Hibino Takashi,Hashimoto Atsuko,Kakimoto Shiro,Sano Mitsuru
Abstract
The non-Nernstian behavior of zirconia-based electrochemical cells with various metal oxide electrodes for 0–500 ppm C1-C4 hydrocarbons, hydrogen, and carbon monoxide was studied in the presence of 10% oxygen at 600°C. The cell using an
In
2
O
3
electrode exhibited a largely negative electromotive force (emf) for propene but gave moderately negative emfs for hydrogen and carbon monoxide. The addition of 0.1 wt %
MnO
2
to the
In
2
O
3
electrode significantly improved the selectivity of the parent electrode for propene over hydrogen and carbon monoxide. The negative emf of the cell using the
MnO
2
-containing
In
2
O
3
electrode for the hydrocarbons became enhanced as the carbon number of the hydrocarbon increased, the C-C linkage was unsaturated, and the chain structure was branched. This enhanced effect, as well as the addition effect of
MnO
2
,
was discussed on the basis of the measurements of the polarization curves of the
MnO
2
-containing
In
2
O
3
electrode for the hydrocarbons and oxygen and the nonelectrochemical oxidation of the hydrocarbons by oxygen. In addition, the
MnO
2
-containing
In
2
O
3
electrode for the hydrocarbons was compared with an Au electrode with respect to sensitivity to the hydrocarbons and reproducibility of the sensing properties. © 2000 The Electrochemical Society. All rights reserved.
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
68 articles.
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