Mechanism of the Sensitivity of the Planar CO Sensor and Its Dependency on Humidity

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Abstract
A planar electrochemical carbon monoxide sensor was fabricated with three electrodes (Pt working, Au reference, and Pt counterelectrode), upon a glass substrate with the electrodes coated with a cast Nafion film. The oxidation current, the impedance between working and counterelectrodes, and the permeability coefficient of a Nafion film were measured from 18 to 83% relative humidity (RH) of air. The observed oxidation current was derived from the measured permeability coefficient. By comparing the observed and calculated currents, the dependency of the oxidation current on RH was shown to be related to the change of the permeability coefficient and the water content of Nafion. The kinetic analysis also showed that the oxidation current was governed by the intermediate kinetic mechanism.

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