Production of Silicon by Solid Oxide Membrane-Based Electrolysis Process
Production of Silicon by Solid Oxide Membrane-Based Electrolysis Process
复制标题
固体氧化物膜电解法生产硅
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Basu
中科院分区：
文献类型：
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作者：
Yihong Jiang;Jiapeng Xu;Xiaofei Guan;U. Pal;S. Basu
固体氧化膜（SOM）电解工艺已经成功地在实验室规模上进行了测试，以低成本和环保的方式直接从二氧化硅生产硅。采用一端封闭的钇稳定氧化锆（YSZ）管将含有溶解二氧化硅的熔盐与放置在YSZ管内的液态金属阳极分离。当熔盐中的液锡阴极与阳极之间的外加电势超过二氧化硅的解离电势时，氧离子通过YSZ膜从熔盐中运出并在阳极氧化，而助熔剂中的硅阳离子则还原为液锡阴极表面的硅。采用动电位扫描（PDS）测定了熔融盐体系中二氧化硅的解离电位。在1.05 V下电解8小时。利用扫描电子显微镜（SEM）和电子色散x射线能谱仪（EDS）证实了液态锡阴极表面存在高纯硅晶体。
The solid oxide membrane (SOM) electrolysis process has been successfully tested on a laboratory scale to produce silicon directly from silica in a cost-effective and eco-friendly way. A one-end-closed yttria-stabilized zirconia (YSZ) tube was employed to separate a molten salt containing dissolved silica from a liquid metal anode placed inside the YSZ tube. When an applied electric potential between a liquid tin cathode in the molten salt and the anode exceeds the dissociation potential of silica, oxygen ions are transported out of the molten salt through the YSZ membrane and oxidized at the anode while the silicon cations in the flux are reduced to silicon on the surface of the liquid tin cathode. A potentiodynamic scan (PDS) was performed to determine the dissociation potential of silica in the molten salt system. Electrolysis was performed at 1.05 V for 8 hours. The presence of high-purity silicon crystals on the surface of liquid tin cathode was confirmed by scanning electron microscopy (SEM) and electron dispersive X-ray spectroscopy (EDS).