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Solid-state electrochemical CO2 sensor by coupling lithium ion conductor (Li2CO3-Li3PO4-Asl2O3) with oxide ion-electron mixed conductor (La0.9Sr0.1MnO3) |
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| Authors: | Yi Can Zhang Hiroaki Tagawa Shukuji Asakura Junichiro Mizusaki Hidekazu Narita |
| Institution: | a Institute of Environmental Science and Technology, Yokohama National University, Yokohama 240, Japan b Research Institute for Scientific Measurements, Tohoku University, Sendai 980-77, Japan c Akebono Brake Research and Development Center, Ltd., Saitama 348, Japan |
| Abstract: | A solid-state electrochemical cell of the type O2(air), PtLa0.9Sr0.1MnO3/Li2CO3(+5 mol% Li3PO4 + 6 mol% Al2O3)/Au, CO2, O2 was composed to determine CO2 concentration, where Li2CO3, a lithium ion conductor, was used as an electrolyte, and the perovskite-type oxide (La0.9Sr0.1MnO3)/O2-electrode as a reference electrode. The electromotive force (EMF) of the cell was found to be proportional to the logarithm of CO/2 partial pressure in CO2/O2/N2 gas mixtures at temperatures between 300 and 400 °C. The EMF responded to changes of CO2 partial pressure within 1 min at 400 °C. The sensitivity to CO2 of this cell was not affected by coexistence of O2, and the EMF remained constant after the first 15 days. The mechanism for sensing CO2 is discussed. |
| Keywords: | CO2 Li2CO3 La0 9Sr0 1MnO3 Lithium ion conductor Oxide ion-electron mixed conductor |
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