P1.9.6 Capacitive Gas-bubble Sensor for Solid Oxide Fuel Cell
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- P1.9 Technology and Application
- A. Kobayashi, H. Hiraoka - Ogihara Mfg. Co., Ltd. (Japan), M. Yamaguchi - Graduate School of Engineering, Iwate University (Japan)
- 1169 - 1172
Solid oxide fuel cell (SOFC) is a type of hydrogen fuel cell for home use. A problem with SOFC is that carbon dioxide (CO2) accompanies the hydrogen, when this is generated from natural gas by fuel reforming. In this study, we propose a gas-bubble sensor which is used in a battery-cell to prevent damage. The gas-bubble sensor has two detection electrodes wound around the outside of a cylindrical plastic housing. By measuring the changes in capacitance, the sensor can detect the presence or absence of gas-bubbles in the water. The water repellency of the plastic housing was improved chemically by using fluoroplastic (ethylene-tetrafluoroethylene copolymer; ETFE) so that the detection accuracy of the mixed gas-bubbles was maintained. As a result, a detection accuracy of 99% at an ultralow flow-rate of 50 µL/s was realized.