Selection About Molten Salts Used For The Electrochemical Reduction of Porous TiO 2 pellets

作者：Kejia Liu, Yaowu Wang, Yuezhong Di, Jianping Peng, Jing You, Feng Naixiang, Yi Zhang · 发表于：Journal of The Electrochemical Society · 年份：2020 · DOI：10.1149/1945-7111/ab8823 · 被引用次数：6 · 研究领域：Molten salt chemistry and electrochemical processes、Metallurgical Processes and Thermodynamics、Iron and Steelmaking Processes

Diagrams of the equilibrium potential E (relative to the standard chlorine electrode) against the activity of oxide ion ( expressed as its logarithm, p O 2− ) in systems of Ti-O-Cl-M (M=Li, Na, Mg, Ca, Sr and Ba) were plotted to investigate the electro-deoxidation of porous TiO 2 pellets in different chloride molten salts, including LiCl, NaCl, MgCl 2 , CaCl 2 , SrCl 2 and BaCl 2 . From the diagrams, the reduction pathways of TiO 2 in different molten salts are similar; and the applied potential (vs Cl − /Cl 2 ) on the cathode and O 2− ion activity influence greatly on the reduction pathway of TiO 2 and the deoxidation limit. To test and verify the results of the thermodynamic analysis, electro-deoxidation experiments in different molten salts were done to determine the actual pathways in the electrochemical reduction of TiO 2 and the possible deoxidation limits in the molten salts. The results indicated that the thermodynamic analysis is helpful in predicting and understanding the electrochemical reduction process of titanium oxides though the experimental results differ slightly from the thermodynamic analysis in some systems. Low-oxygen Ti can be obtained only in molten CaCl 2 .