|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||High Temperature Electrochemistry IV
||Electrochemical Reactions of Oxide Ions with Tungsten in Molten CaCl<sub>2</sub>
||Chao Zhang, Devin Rappleye, Michael F. Simpson
|On-Site Speaker (Planned)
||Michael F. Simpson
In support of development of a real time electrochemical sensor for measuring oxide ion concentrations in molten CaCl<sub>2</sub>, cyclic voltammetry was run in molten CaCl<sub>2</sub> with controlled additions of CaO. The magnitude of an oxidation peak at close to 0 V versus a W quasi-reference electrode correlated linearly with concentration of added CaO. The reaction mechanism appears to consist of two electrochemical steps followed by a chemical reaction to form CaWO<sub>4</sub>, which is soluble in the salt. These findings are beneficial to controlling electrochemical nuclear material processing such as direct oxide reduction of actinides. A simple probe consisting of three W rods can be used to monitor CaO concentration in real time.