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 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. 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.

Automated summary

The electrochemical interaction of oxide ions with tungsten electrodes in molten calcium chloride was analyzed using electroanalytical techniques and X-ray photoelectron spectroscopy. The process involves a multi-step oxidation and reduction process, allowing for real-time monitoring of oxide content in the salt. The correlation between oxide ion concentration and cyclic voltammetry oxidation peaks agrees closely with back titration measurements and can be applied in calcium chloride-based pyroprocesses.