Research on the Effect of Oxygen Ions on the Coordination Structure and Electrochemical Behavior of Titanium Ions in NaCl-KCl Melt

TL;DR

This study investigates how oxygen ions affect the coordination and electrochemical behavior of titanium ions in a molten salt mixture.

Contribution

The research provides new insights into the role of oxygen ions in forming titanium complexes in molten salts.

Findings

Oxygen ions replace chloride ions in forming TiOxClym− complexes as their content increases.

XPS and Raman spectroscopy confirmed the coordination structure changes with oxygen ion content.

Electrochemical techniques revealed altered behavior of titanium ions with varying titanium-oxygen ratios.

Abstract

Presently, extensive research has been conducted on the electrochemical behavior of titanium ions in molten salt, especially in relation to titanium fluoride coordination. However, there is limited research on the coordination between titanium and oxygen. Consequently, this research delved into the influence of oxygen ions on the electrochemical behavior and coordination properties of titanium ions through the utilization of both electrochemical and spectroscopy techniques. The study involved the use of cyclic voltammetry (CV), square wave voltammetry (SWV), and the open-circuit potential (OCP) method to explore the electrochemical properties of titanium ions at different titanium-oxygen ratios. Furthermore, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were applied to assess the presence of titanium ions in molten salt and the coordination structure of titanium ions and anions in molten salts, respectively. The results demonstrate that with an increase in oxygen ion content, chloride ions are gradually replaced by oxygen ions, forming TiOxClym− complexes.

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