液态金属电极熔盐中沉积硅

fundamental electrochemical study of Si ions electrodeposition and physical diffusion behavior in Na3AlF6-LiF melts and electrolysis using Al and Cu-Si liquid cathodes was conducted under 950℃. The results indicates that the depolarization of silicon deposition on liquid cathode and Reduction potential of Si is higher than solid electrodes. Besides, the concentration Si ions in melt have an extremely influence on electrodeposition process, co-deposition of Al and Si is possible when Si ions are insufficient in the molten salt. The change of open circuit voltage on liquid electrodes illustrate the diffusion rate of Si ions in Cu-Si alloy is quicker than it in Al melt. The basic physical data such as activity coefficient of Si in alloy under different concentration can be accessed by evaluate open circuit voltage, which build a bridge between electrochemical study result and physical properties of materials. Galvanostatic electrolysis showed that liquid cathodes are appropriate to collect the deposited solid silicon and the highest collection efficiency is almost 85%.