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      Bi/Bi 2O 3 sensor for quantitation of dissolved oxygen in molten salts

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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/Bi 2O 3 reference electrode, focusing on its output accuracy. When the above sensor was tested in a flow of gas with known oxygen partial pressure, p O2, a linear relationship between lg p O2 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.

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          Author and article information

          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 March 2018
          : 07
          : 01
          : 1-4
          Affiliations
          [ a ] East China Normal University, Shanghai 200241, China
          [ b ] Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
          Author notes
          * Corresponding author. E-mail: qli@ 123456chem.ecnu.edu.cn
          Article
          2226-4108-07-01-1
          10.1007/s40145-017-0250-4

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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