1. Characteristics and performance of NASICON-based CO2 sensor using Bi8Nb2O17 plus Pt as solid-reference electrode
- Author
-
Xing-Min Guo and Heng-Yao Dang
- Subjects
Working electrode ,Materials science ,Scanning electron microscope ,Metals and Alloys ,Analytical chemistry ,Partial pressure ,Condensed Matter Physics ,Reference electrode ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Carbon dioxide sensor ,Electrode ,Materials Chemistry ,Fast ion conductor ,Thermal stability ,Electrical and Electronic Engineering ,Instrumentation - Abstract
The gas sensing properties of NASICON-based CO 2 sensor attached with a composite of Bi 8 Nb 2 O 17 plus small amount of Pt as a solid-reference electrode has been investigated for application of the sensor at high CO 2 concentration. Compared with conventional sensor coated with Pt reference electrode, the sensor attached with solid-reference electrode was found to efficiently improve the detection limit due to the presence of solid-reference electrode prevented NASICON reacting with CO 2 and water to form carbonate or bicarbonate. A good bonding interface between the solid-reference electrode and NASICON was formed as revealed by the scanning electron spectroscopy (SEM), which provided a powerful guarantee for the thermal stability of the sensor. Furthermore, the as-fabricated sensor also exhibited fast response time, small cross-sensitivity to humidity and little interference from the coexistent oxygen partial pressure at 500 °C. All the present results suggest that using the composite of Bi 8 Nb 2 O 17 plus Pt as a solid-reference electrode is a promising candidate for NASICON-based CO 2 sensor.
- Published
- 2013