Electroanalytical Measurements of Oxide Ions in Molten CaCl2 on W electrode

Zhang, Chao; Rappleye, Devin; Nelson, Art; Simpson, Scott; Simpson, Michael

doi:10.1149/1945-7111/ac208e

Title: Electroanalytical Measurements of Oxide Ions in Molten CaCl₂ on W electrode

Journal Article · Thu Sep 02 00:00:00 UTC 2021 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/1945-7111/ac208e · OSTI ID:1829586

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^[2]; Nelson, Art ^[3];

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Univ. of Utah, Salt Lake City, UT (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Brigham Young Univ., Provo, UT (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Utah, Salt Lake City, UT (United States)

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1829586

Report Number(s):: LLNL-JRNL--811812; 1018091

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 9 Vol. 168; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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