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Journal Article
Durability Improvement of Solid Electrolyte CO2 Sensor Against Humidity Variations
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- Issue Date
- 2015-01
- Citation
- Journal of Nanoscience and Nanotechnology, v.15, no.1, pp.404-407
- ISSN
- 1533-4880
- Publisher
- American Scientific Publishers (ASP)
- Language
- English
- Type
- Journal Article
- Abstract
- The sensing materials of potentiometric CO2 sensors utilize alkali/alkali-earth metal carbonates or their combinations. However, lithium carbonate easily responds to humidity resulting in incorrect information regarding CO2 concentration. Herein, the authors report a new sensing material combination (Li2CO3/BaCO3/LiOH/Ba(OH)2 (1:2:0.05:0.1 molar ratio)) for a potentiometric CO2 sensor that is not affected by humidity. The electromotive force (EMF) of the sensor using a combination of Li2CO3, BaCO3, LiOH, and Ba(OH)2 drifted by 1.5% when the relative humidity was changed from 25% to 70%, which is superior to a drift of 6% of a sensor using Li2CO3and BaCO3, as this sensing material is known to be robust to changes in humidity.
- KSP Keywords
- Alkali-earth metal, CO2 sensor, Co2 concentration, Durability improvement, Electromotive force (emf), Lithium carbonate, Material combination, Metal carbonates, Molar ratio, Relative Humidity, Sensing material