Direct Synthesis of High Purity Silicon Wires by Electrorefining in Molten KF-NaF Eutectic |
| |
Authors: | Xiang-yu Zou Hong-wei Xie Yu-chun Zhai Xiao-chuan Lang |
| |
Institution: | School of Materials and Metallurgy, Northeastern University, Shenyang 110189, China |
| |
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. |
| |
Keywords: | Silicon wire Electrorefining Cyclic voltammetry ac impedance |
|
| 点击此处可从《化学物理学报(中文版)》浏览原始摘要信息 |
| 点击此处可从《化学物理学报(中文版)》下载免费的PDF全文 |