Title :
High-performance solid electrolyte CO/sub 2/ sensor fitted with binary carbonate electrode
Author :
Miura, N. ; Yao, S. ; Shimizu, Y. ; Yamazoe, N.
Author_Institution :
Dept. of Mater. Sci. & Technol., Kyushu Univ., Fukuoka, Japan
Abstract :
A simple potentiometric CO/sub 2/ sensor based on an Na/sup +/-conducting solid electrolyte (NASICON) was found to be greatly improved in response time and water-vapor resistance by using a binary carbonate electrode of BaCO/sub 3/-Na/sub 2/CO/sub 3/. For a wide range of CO/sub 2/ concentration from 4 to 400000 ppm, the electromotive force examined at 823 K followed a Nernst´s equation excellently, with a 90% response time of as short as 8 s or less. Water vapor hardly affected the sensor characteristics, in contrast to the case of a pure Na/sub 2/CO/sub 3/ electrode. The structure and CO/sub 2/ sensing mechanism of the binary carbonate electrode are briefly discussed.<>
Keywords :
carbon compounds; chemical variables measurement; electric sensing devices; gas sensors; 8 s; 823 K; BaCO/sub 3/-Na/sub 2/CO/sub 3/; NASICON; Na/sub 3/Zr/sub 2/Si/sub 2/PO/sub 12/; Nernst´s equation; binary carbonate electrode; electromotive force; potentiometric sensor; response time; solid electrolyte; solid electrolyte CO/sub 2/ sensor; Conductors; Delay; Electrodes; Force measurement; Gas detectors; Gases; Nitrogen; Solids; Stability; Testing;
Conference_Titel :
Solid-State Sensors and Actuators, 1991. Digest of Technical Papers, TRANSDUCERS '91., 1991 International Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-87942-585-7
DOI :
10.1109/SENSOR.1991.148938
