GS6.4 - VOC Sensing Properties of YSZ-Based Gas Sensors Attached with Au-Based Electrodes Prepared by a Drop-Coating Method
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- Gas Sensors 6 - Sensing VOCs
- T. Ueda, S. Ono, K. Kamada, T. Hyodo, Y. Shimizu - Graduate School of Engineering, Nagasaki University, Nagasaki (Japan), T. Suzuki - Gas Equipment R & D Center, Yazaki Energy System Corporation (Japan)
- 240 - 241
YSZ-based potentiometric gas sensors using a CeO2-added Au sensing electrode (Au(nCeO2)-dr, n: an additive amount of CeO2 (wt%)) were fabricated by a drop-coating (dr) method, and their sensing properties to toluene and methyl mercaptan were examined in the temperature range of 400-600°C. The magnitude of response (∆E) to 50 ppm toluene increased by the addition of a small amount of CeO2, and the Au(8CeO2)-dr sensor showed the largest response among all the sensors with different amounts of CeO2. The Au(8CeO2)-dr sensor showed an almost linear relationship between the E and the logarithm of toluene concentration in the range of 20-100 ppm at 500°C. The balance between the catalytic activity and the electrocatalytic activity for toluene oxidation probably dominates the magnitude of the response. The Au(8CeO2)-dr sensor also showed rather high response to a low concentration of methyl mercaptan (∆E: 17 mV, 0.1 ppm) at 500°C.