Abstract
Silicon (Si) nanowire as a kind of one-dimensional semiconductor material is widely used in solar cells, biosensors, nanoelectronic devices, and lithium-ion batteries, among other applications. Traditional preparation methods for Si nanowires require high-purity substrates and metal catalysts. Herein, we report an efficient method of synthesizing Si nanowires by electrochemical reduction of CaSiO3 in CaCl2 molten salt. An electrolytic cell with a ceramic diaphragm is designed to separate the cathode and anode, which effectively avoids the migration and enrichment of oxygen and impurity ions. The ceramic diaphragm slows the diffusion of O2− ions and is favorable to the formation of Si nanowires. Electron microscopy and XRD analysis reveal that the electrolytic products are mainly Si nanowires with a uniform size of 20–60 nm. The as-synthesized Si nanowires evaluated as an anode material for lithium-ion batteries deliver a reversible capacity of 886 mA h g–1 after 150 cycles at 0.2 A g–1.
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The authors are grateful for the financial support from the Natural Science Foundation of Zhejiang Province (Grant No. LY18B030008).
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Gan, Y., Yu, Z., Chen, B. et al. Highly Efficient Synthesis of Silicon Nanowires from Molten Salt Electrolysis Cell with a Ceramic Diaphragm. J. Electron. Mater. 50, 5021–5028 (2021). https://doi.org/10.1007/s11664-021-08941-5
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DOI: https://doi.org/10.1007/s11664-021-08941-5