Electrodeposition of Silicon with a Liquid Gallium Cathode in Molten Salts
Electrodeposition of Silicon with a Liquid Gallium Cathode in Molten Salts
复制标题
硅与液态镓阴极在熔盐中的电沉积
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
T. Nohira
中科院分区：
文献类型：
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作者：
G. Haarberg;Tomonori Kato;Yutaro Norikawa;T. Nohira
太阳能的进一步发展在很大程度上取决于廉价的太阳能级硅的可用性。电沉积是一种以合理的成本生产高纯度硅的候选方法。采用液态镓阴极研究了含K2SiF6熔盐电解质沉积硅的新方法。在650℃下进行了共晶KCl-KF熔液中加入K2SiF6的电化学研究和电解沉积硅的方法，工作电极为银丝和玻璃钢棒，反电极为玻璃钢棒或银丝。采用硅板参比电极。电解过程中，含钨铅的小氧化铝管中的液态镓为阴极，玻璃碳或硅为阳极。在电解过程中，硅被发现沉积在液态镓阴极内。发现电流效率相当高，一直在80%以上。
Further development of solar power depends largely on the availability of inexpensive solar grade silicon. Electrodeposition is a candidate method to produce high purity silicon at a reasonable cost. A new approach using a liquid gallium cathode was used to study deposition of silicon from molten salt electrolytes containing K2SiF6. Electrochemical studies and electrolysis to deposit silicon from molten eutectic KCl–KF with additions of K2SiF6 were carried out at 650 C. Silver wire and glassy carbon rod were used as working electrodes, while glassy carbon rod or silver wire were counter electrodes. A silicon plate reference electrode was used. Liquid gallium in a small alumina tube with tungsten lead was the cathode during electrolysis while glassy carbon or silicon was the anode. Silicon was found to deposit inside a liquid gallium cathode during electrolysis. The current efficiency was found to be quite high, and consistently above 80 %.