Improvement of the NO selectivity for a planar YSZ sensor

Abstract

International audienceIn 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

A review of mixed-potential type zirconia-based gas sensors

“…In 1996 and 1997, Sorita and Kawano have also reported the YSZ-based sensor using various mixed oxides (e.g., perovskite and spinel) as SE coated with an Al 2 O 3 (+Pt) catalyst layer for selective detection of CO (or H 2 ) [49,50]. Since then, substantial development of this type of gas sensors has been achieved early in this century by many leading research groups in the world [51][52][53][54][55][56][57][58][59][60][61][62][63][64].…”

Promotion effect of Pt on a SnO2–WO3 material for NO sensing

“…NO can react to form nitrous and nitric acids that cause acid rain. Hence, developing a NO sensor for measuring NO levels is critical to monitor and hopefully reduce NO pollution [2]. NO is often monitored by using chemical sensors of various resistive [3], amperometric [4], quartz crystal microbalance [5], optical [6], and capacitive [7] types.…”

Temperature Compensation Methods of Nondispersive Infrared CO2 Gas Sensor with Dual Ellipsoidal Optical Waveguide

“…(3)(4)(5) Because the principles of the abovementioned sensors are mainly based on the chemical reactions between the target gas and the surface of the sensor, they are heated to activate the surfaces of the sensors to improve the sensitivity of the sensor itself. However, devices working on this principle show poor selectivity amongst other ambient gases (mainly water vapor, hydrocarbons, and carbon monoxide) because the surfaces are exposed directly to the ambient environment, (6,7) whereas nondispersive infrared (NDIR) sensors are considered to be specific to those species alone. (8) Although there are some technical methods for improving the selectivity of nonoptical sensors, it is cumbersome to discriminate the target gas from other ambient gases in practical applications.…”