Sensing properties and mechanism of a planar carbon dioxide sensor using magnesia-stabilized zirconia and lithium carbonate auxiliary phase
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 5 (9) , 1391-1394
- https://doi.org/10.1039/jm9950501391
Abstract
A planar electrochemical device using MgO-stabilized zirconia (MSZ) and Li2CO3 has been fabricated for potentiometric sensing of CO2. The emf response of the device to CO2 followed the Nernst equation well in the concentration range 100–2000 µl l–1 at 500–650 °C, and was kept unchanged with a variation in the concentration of coexistent O2, NO, NO2, H2 or H2O. The rates of response and recovery were fairly rapid, attaining 90% of the changes in 10 s and 2 min, respectively, for 100–1000 µl l–1 CO2 at 550–600 °C. The electrochemical chain as well as the emf response to CO2 of the novel device can be explained by considering the formation of Li2ZrO3 between MSZ (O2– conductor) and Li2CO3(Li+ conductor) as an ‘ionic bridge’.Keywords
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