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Research Article | Open Access

Bi/Bi2O3 sensor for quantitation of dissolved oxygen in molten salts

Huiping ZHENGa, Hongqiang NIANb, Jinfeng XIAb, Guohong ZHOUb, Danyu JIANGb, Qiang LIa( )
East China Normal University, Shanghai 200241, China
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
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Abstract

To quantify the oxygen content in molten salts, we examined the performance of an yttria-stabilized zirconia solid electrolyte oxygen sensor with a Bi/Bi2O3 reference electrode, focusing on its output accuracy. When the above sensor was tested in a flow of gas with known oxygen partial pressure, pO2, a linear relationship between lgpO2 and the electromotive force (EMF) was observed, and the correlation slope exhibited a positive deviation from Nernstian behavior. EMF measurements performed in molten NaCl–KCl indicated that the oxygen content of this salt mixture increased with increasing oxygen partial pressure in the covering gas, in agreement with Henry’s law. Moreover, the EMF exhibited a linear decrease with increasing melt temperature of molten NaCl–KCl, in agreement with the theoretical model. Finally, a relationship between the structure of molten NaCl–KCl and its oxygen diffusion behavior was established. As a result, the developed sensor was demonstrated to be well suited for determining the oxygen content of molten salts.

Keywords

molten saltoxygen sensorBi/Bi2O3oxygen content

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Journal of Advanced Ceramics
Volume 7 Issue 1,
March 2018
Pages 1-4
DOI: 10.1007/s40145-017-0250-4
Cite this article:
ZHENG H, NIAN H, XIA J, et al. Bi/Bi2O3 sensor for quantitation of dissolved oxygen in molten salts. Journal of Advanced Ceramics, 2018, 7(1): 1-4. https://doi.org/10.1007/s40145-017-0250-4

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Received: 16 August 2017
Accepted: 02 October 2017
Published: 28 December 2017
© The author(s) 2017

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/ by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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