Study of YSZ-Based Electrochemical Sensors with WO[sub 3] Electrodes in NO[sub 2] and CO Environments

Electrochemical sensors based on yttria-stabilized zirconia (YSZ) with as a sensing electrode were fabricated using either Pt or Au electrodes. The sensors were studied in the temperature range 500-700°C in the presence of different concentrations (300-1000 ppm) of and CO in air. The response to was very stable with fast response time (within 20 s). The best sensitivity was observed at 600 and 650°C using Pt and Au electrodes, respectively. At all temperatures investigated a cross sensitivity to CO gas was also noticed. The response to CO was decreased using Au electrodes. The role played by as a sensing electrode was investigated. © 2002 The Electrochemical Society. All rights reserved.