Improvement of the NOx selectivity for a planar YSZ sensor

[摘要] In recent years planar yttria-stabilized zirconia (YSZ) based electrochemical gas sensors for automotive exhaust applications have become a major source of interest. The present work aims to develop a sensor for industrialisation. For this reason planar YSZ-based electrochemical sensors using two metallic electrodes (platinum and gold) were fabricated using screen-printing technology and tested in a laboratory test bench for different concentrations of pollutant gas such as CO, NO, NO2 and hydrocarbons in oxygen rich atmosphere. It was furthermore shown that the selectivity towards NOx could be highly reinforced by deposing a catalytic filter consisting of 1.7-4.5 wt.% Pt dispersed on alumina directly on the sensing elements. This filter was characterized by the use of SEM, TPD and XRD. (C) 2010 Elsevier B.V. All rights reserved.

[发布日期] 2011-06-20

[效力级别]  Proceedings Paper

[关键词] Electrochemical gas sensor;NOx sensor;Catalytic filter;NOx selectivity;Automotive exhaust