Effect of Oxygen Content on Impedance Spectra of PtRh Electrodes for NOX Sensing Applications

Abstract:

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Growing awareness of dangers related to NOX emission by industry and road transportation has resulted in increasing demand for sensors detecting NOX. An important class of these sensors use Pt-based electrodes applied on yttria-stabilized zirconia (YSZ) substrates. Performance of such sensors depends on redox reactions occurring at electrodes in the tested atmospheres. Impedance spectra and j-U curves of PtRh electrodes were measured in a 3-electrode mode, using Pt metal pads as counter and reference electrodes. The data were collected in a 10mHz- 100kHz frequency range at temperatures from 450 to 750°C. Each series of measurements was carried out in a gas mixture with different oxygen content ranging from 0 to 21 vol%. It was found out that the low-frequency part of the impedance spectra (characterizing electrode processes) was sensitive to the oxygen content in the gas mixtures.

Info:

Periodical:

Materials Science Forum (Volumes 514-516)

Edited by:

Paula Maria Vilarinho

Pages:

1379-1384

DOI:

10.4028/www.scientific.net/MSF.514-516.1379

Citation:

P. Kurek et al., "Effect of Oxygen Content on Impedance Spectra of PtRh Electrodes for NOX Sensing Applications", Materials Science Forum, Vols. 514-516, pp. 1379-1384, 2006

Online since:

May 2006

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Price:

$35.00

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