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
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

Direct Synthesis of High Purity Silicon Wires by Electrorefining in Molten KF-NaF Eutectic

doi: 10.1063/1674-0068/26/01/88-94
Funds:  This work is supported by the Liaoning Province Sci-ence Foundation for Youths of China (No.20111011).
  • Received Date: 2012-10-16
  • 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.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Direct Synthesis of High Purity Silicon Wires by Electrorefining in Molten KF-NaF Eutectic

doi: 10.1063/1674-0068/26/01/88-94
Funds:  This work is supported by the Liaoning Province Sci-ence Foundation for Youths of China (No.20111011).

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.

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
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

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