Electroanalytical Measurements of Oxide Ions in Molten CaCl2 on W electrode

The electrochemical interaction of oxide ions with tungsten electrodes in molten calcium chloride (CaCl2) was analyzed by combining electroanalytical techniques with X-ray photoelectron spectroscopy. During a cyclic voltammetry (CV) scan, the oxide ions appear to interact with the tungsten working e...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2021-09, Vol.168 (9)
Main Authors: Zhang, Chao, Rappleye, Devin, Nelson, Art, Simpson, Scott, Simpson, Michael
Format: Article
Language:English
Subjects:
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Summary:The electrochemical interaction of oxide ions with tungsten electrodes in molten calcium chloride (CaCl2) was analyzed by combining electroanalytical techniques with X-ray photoelectron spectroscopy. During a cyclic voltammetry (CV) scan, the oxide ions appear to interact with the tungsten working electrode via a multi-step oxidation and reduction process. The overall redox peaks behave reversibly up to 750 mV s-1. This electrochemical process enables the oxide ion concentration to be correlated to CV oxidation peaks. Lastly, the resulting correlation agrees well (8.8% difference) with back titration measurements and can be used to monitor oxide content in the salt in real-time during CaCl2 based pryoprocesses.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ac208e