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有色金属(冶炼部分):2019,(11):70-74
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CaCl2-NaCl熔盐对电解SiO2制备Si纳米线的影响
周忠仁1,2, 张英杰1, 华一新1, 董鹏1, 汝娟坚1, 段建国1
(1.昆明理工大学 冶金与能源工程学院;2.锂离子电池及材料国家地方联合工程实验室)
Influence of CaCl2-NaCl Molten Salt on Preparation of Silicon Nanowire via Electrolysis of SiO2
ZHOU Zhong-ren1,2, ZHANG Ying-jie, HUA Yi-xin, DONG Peng, RU Juan-jian, DUAN Jian-guo
(1.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;2.National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology)
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投稿时间:2019-06-18    修订日期:2019-06-28
中文摘要: 采用熔盐电解法,以SiO2粉末为阴极原料、等摩尔比的CaCl2-NaCl混合熔盐为电解质、石墨棒为电解阳极,在700 ℃、1.8 V槽电压下,经过5 h电解后,制备得到数微米长、200 nm宽的硅纳米线。讨论了电解质对阴极原料SiO2的影响。在700 ℃的熔盐中浸泡2 h后,原料物相并未改变,而微观形貌由最初的类球形颗粒转变成彼此相连的网状或泡沫状多孔体。SiO2在电解过程中生成中间产物CaSiO3,CaSiO3进一步电解后,生成成了单质硅。
中文关键词: 硅纳米线  SiO2  熔盐电解质
Abstract:Nanosized silicon with several micrometers in length and 200 nm in width was synthesized by molten salt electrolysis method at 700 ℃ under cell voltage of 1.8 V for 5 h applying SiO2 powder as cathode raw material, equimolar CaCl2-NaCl mixed molten salt as electrolyte and graphite rod as anode. Effect of molten salt on cathode raw SiO2 was investigated. After rinsed in molten salt for 2 h at 700 ℃, raw material SiO2 is characterized by XRD and SEM. The results suggest that phase of raw material is unchanged but morphology has been converted from initial spheroidal particles to inter-linked network and porous structure. During electrolysis of SiO2, intermediate CaSiO3 is produced, which is further electrolyzed for final formation of metallic silicon.
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基金项目:国家自然科学基金资助项目(51804148,51764029);云南省应用基础研究计划项目(2018FD038)
引用文本:
周忠仁,张英杰,华一新,董鹏,汝娟坚,段建国.CaCl2-NaCl熔盐对电解SiO2制备Si纳米线的影响[J].有色金属(冶炼部分),2019(11):70-74.
ZHOU Zhong-ren,ZHANG Ying-jie,HUA Yi-xin,DONG Peng,RU Juan-jian,DUAN Jian-guo.Influence of CaCl2-NaCl Molten Salt on Preparation of Silicon Nanowire via Electrolysis of SiO2[J].Nonferrous Metals (Extractive Metallurgy),2019(11):70-74.

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