Effect of electrolysis potential on reduction of solid silicon dioxide in molten CaCl2
Effect of electrolysis potential on reduction of solid silicon dioxide in molten CaCl2
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DOI：
10.1016/j.jpcs.2004.06.037
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发表时间：
2005-02
影响因子：
4
通讯作者：
K. Yasuda;T. Nohira;Y. Ito
中科院分区：
文献类型：
--
作者：
K. Yasuda;T. Nohira;Y. Ito
采用接触电极法研究了1123 K下CaCl 2熔体中SiO2的电化学还原。在0.35-1.30V（vs. Ca ~（2+）/Ca）下恒电位电解1h制备样品。XRD、SEM和EPMA分析结果表明，SiO2在1.25V以上的负电位下被电还原为Si，这与热力学计算结果一致。电解过程中的电流-时间曲线和样品的横截面SEM测量清楚地表明，在更负的电位下还原速率更高。此外，在0.35V下证实了Si-Ca合金的形成。
Electrochemical reduction of solid SiO2by using a contacting electrode method was investigated in molten CaCl2at 1123K. The samples were prepared by potentiostatic electrolysis at 0.35–1.30V (vs. Ca2+/Ca) for 1h. From the results of XRD, SEM and EPMA, it was confirmed that SiO2was electrochemically reduced to Si at 1.25V or more negative potential, which agreed with the thermodynamic calculation. The current–time curves during electrolysis and the cross-sectional SEM measurements of the samples clearly showed that reduction rate is higher at more negative potential. In addition, Si–Ca alloy formation was confirmed at 0.35V.