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Potentiometric SO2 gas sensor based on a thick film of Ca2+ ion conducting solid electrolyte

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Abstract

A planar miniaturized SO2 sensor based upon a thick film of Ca2+ ion conductor-CaO·0.6MgO·6Al2O3 (CMA) with a Na2SO4 auxiliary electrode and a Pt/O2 reference electrode was fabricated and tested. The thick film was fabricated by screen-printing CMA ink on an alumina substrate and then fired at 1823 K. The solid electrolyte was interfaced with a sodium sulphate auxiliary phase containing Pt paste and the sensor showed a good SO2 response at 873–1073 K. The electromotive force (emf) values obtained were linearly dependent upon the logarithm values of SO2 concentration in a range of 10–500 ppm. Both the electrodes were exposed to the same test gas thus eliminating the need to separate the electrode chambers.

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Acknowledgement

The financial support of EPSRC for this project is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB2 3QZ, UK

    L. Wang & R.V. Kumar

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  1. L. Wang
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  2. R.V. Kumar
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Correspondence to R.V. Kumar.

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Wang, L., Kumar, R. Potentiometric SO2 gas sensor based on a thick film of Ca2+ ion conducting solid electrolyte. J Appl Electrochem 36, 173–178 (2006). https://doi.org/10.1007/s10800-005-9050-6

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  • DOI: https://doi.org/10.1007/s10800-005-9050-6

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