Bi-electrolyte Carbon Dioxide Gas Sensor Based on Paste Sodium-Beta Alumina and Yttria-stabilized Zirconia
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
CO2 sensor was used only one solid electrolyte in many cases. To improve the sensing characteristics of CO2 sensors, solid electrolyte CO2 sensor has been developed by bi-electrolyte type sensor using Na-Beta-alumina and YSZ. However, in many further studies, bielectrolyte type sensor was made by pellet pressed by press machine and additional treatment for formation of interface. In the aspect of mass production, using thick film and additional treatment is not suitable. In this study, CO2 sensor was fabricated by bi-electrolyte structure which was made by an NBA paste layer deposited on YSZ pellet and fired at 1650oC for 2 hour. The formation of stable interface between YSZ and NBA were confirmed by SEM image. When the type IV electrochemical cell arrangement represented by CO2,O2,Pt| Li2CO3-CaCO3||NBA||YSZ|O2,Pt is used to measure the CO2 concentration in air. This sensor EMF should depend only on the concentration of CO2 by logarithmic. Also, sensor shows PCO2 and EMF relationship like nerstian reaction at a temperature of 450oC.
Abstract
CO2 sensor was used only one solid electrolyte in many cases. To improve the sensing characteristics of CO2 sensors, solid electrolyte CO2 sensor has been developed by bi-electrolyte type sensor using Na-Beta-alumina and YSZ. However, in many further studies, bielectrolyte type sensor was made by pellet pressed by press machine and additional treatment for formation of interface. In the aspect of mass production, using thick film and additional treatment is not suitable. In this study, CO2 sensor was fabricated by bi-electrolyte structure which was made by an NBA paste layer deposited on YSZ pellet and fired at 1650oC for 2 hour. The formation of stable interface between YSZ and NBA were confirmed by SEM image. When the type IV electrochemical cell arrangement represented by CO2,O2,Pt| Li2CO3-CaCO3||NBA||YSZ|O2,Pt is used to measure the CO2 concentration in air. This sensor EMF should depend only on the concentration of CO2 by logarithmic. Also, sensor shows PCO2 and EMF relationship like nerstian reaction at a temperature of 450oC.
참고문헌 (8)
- M. Gauthier, "Solid-state detectors for the potentiometric determination of gaseous oxides", J. Eletrochem. Soc., 124, pp.1579~1583 (1977)
- Y. Saito, "Recent developments of the sensors for carbon oxides using solid electrolytes", Solid State Ion., 28, pp.1644~1647 (1988)
- S. Yao, "Solid electrolyte CO2 sensor using NASICON and Li-based binary carbonate electrode", Chem. Lett., 20, pp.2069~2072 (1991)
- H. Näfe, "On the electrode reaction of the Au|CO2,O2, Me2CO3 (Me = Li, Na, K)|Yttria-stabilized zirconia electrode", Journal of Electrochemical Society, 144, pp.915~922 (1997)
- T. Maruyama, "Potentiometric gas sensor for carbon dioxide using solid electrolytes", Solid State Ion., 23, pp.107~ (1987)
- H. Nafe, "Thermodynamic conditions at the interface between Na-beta- alumina and stabilized zirconia in a bielectrolyte galvanic cell", Solid State Ion., 93, pp.117~123 (1997)
- G. M. Kalea, "Planar SOX sensor incorporating a bi-electrolyte", Solid State Ion., 161, pp.155~203
- S. Yao, "Solid electrolyte CO2 sensor using binary carbonate electrode", Chem. Lett., 19, pp.2033~2036 (1990)