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| Study on Dissolution-Electrodeposition of Silicon Dichloride By-products Tetrachloride in Ionic Liquids |
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Received:December 24, 2018
Revised:December 26, 2018
Accepted:January 03, 2019
Published Online:March 19, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.04.016 |
| KeyWord:silicon tetrachloride; ionic liquid; dissolution; electrodeposition |
| Author | Institution |
| lixiao |
上海第二工业大学电子废弃物研究中心 |
| ZHANG Cheng-long |
上海第二工业大学电子废弃物研究中心 |
| Wu liang |
上海大学理学院物理系 |
| Ma en |
上海第二工业大学电子废弃物研究中心 |
| Wang Ruixue |
上海第二工业大学电子废弃物研究中心 |
| Yuan Wenyi |
上海第二工业大学电子废弃物研究中心 |
| Bai Jianfeng |
上海第二工业大学电子废弃物研究中心 |
| Wang Jingwei |
上海第二工业大学电子废弃物研究中心 |
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| Abstract: |
| Dissolution and electrodeposition process of silicon tetrachloride (SiCl4) in ionic liquids were investigated. The results show that solubility of SiCl4 in ionic liquid drops with increase of temperature, and conductivity of ionic liquid rises with increase of temperature. When anion is [TNf2], quaternary ammonium ionic liquid with cation of [N1114] has better solubility of SiCl4 and conductivity than that of imidazole [Bmim] ionic liquid. Solubility of SiCl4 in quaternary ammonium ionic liquid rises with increase of alkyl backbone length, and drops with increase of side chain length. C-Cl, Si-O and C-Si bonds are formed between [N1114][TNf2] and SiCl4. Reduction potential of Si4+ in [N1114][TNf2]-SiCl4 system is -2.2 V. Dense silicon film with spherical particle distribution can be obtained by electrowinning at temperature of 25 ℃, concentration of SiCl4 of 0.3 mol/L, current density of 20 A/m2 , and electrolysis time of 2 h. |
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