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Solid-state potentiometric CO2 sensor based on Li22co3-MgO electrolyte

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Abstract

A type II solid state electrochemical CO2 sensor was investigated using a two-phase mixture of Li22co3 and MgO as solid electrolyte and LiMn2O4 as reference electrode. The electromotive force of the galvanic cell, the reproducibility and the long-term stability of the sensor signal were examined under dry and humid conditions in the temperature range between 300 and 400 °C. The emf dependence on the partial pressure of CO2 follows a Nernstian type equation. The sensitivity to CO2 is affected by water vapor, but a logarithmic relationship of the emf on the CO2 partial pressure is also observed for humid gases. The cell shows long-term stability and good reproducibility of the sensor signal.

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Authors and Affiliations

  1. Sensors and Solid State Ionics, Faculty of Engineering, Christian-Albrechts University, D-24143, Kiel, Germany

    F. Salam & W. Weppner

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  1. F. Salam
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  2. W. Weppner
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Salam, F., Weppner, W. Solid-state potentiometric CO2 sensor based on Li22co3-MgO electrolyte. Ionics 4, 355–359 (1998). https://doi.org/10.1007/BF02375877

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  • DOI: https://doi.org/10.1007/BF02375877

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