Direct Synthesis of High Purity Silicon Wires by Electrorefining in Molten KF-NaF Eutectic
- Received Date: 2012-10-16
Abstract: The electrochemical synthesis silicon wires by electrorefining metallurgical grade silicon in thermally dried and pre-electrolyzed molten KF-NaF eutectic were studied at temperatures 800-900 oC using cyclic voltammetry and ac impedance. One oxidation peak at -0.14 V could be attributed to the reaction of Si to Si4+. A cathodic peak occurred at -0.56 V in the cyclic voltammogram and one response semicircle in the ac impedance spectrum was observed, supporting a one-step electrochemical reduction process of Si4+→Si. The electrochemical reaction of silicon was controlled by the diffusion process. The purity of electrorefined silicon wires was up to 99.999% by ICP-MS analysis.
|Citation:||Xiang-yu Zou, Hong-wei Xie, Yu-chun Zhai, Xiao-chuan Lang. Direct Synthesis of High Purity Silicon Wires by Electrorefining in Molten KF-NaF Eutectic[J]. Chinese Journal of Chemical Physics , 2013, 26(1): 88-94. doi: 10.1063/1674-0068/26/01/88-94|