多孔硅的模板限制镁热还原法制备及性能

doi:10.3866/PKU.WHXB20111110

Abstract

Abstract: Novel nanoporous silicon was successfully converted from SiO₂ aerogels by a template-confined magnesiothermic reduction at low temperature (650°C) based on a gas-solid reaction. The composition, crystal structure, morphology, and pore structure of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett- Teller (BET) surface area analysis. Their optical and electrochemical properties were also investigated. The results indicated that the products consisted of nanocrystalline silicon, retained a morphology similar to that of the original templates, and possessed a specific surface area as high as 602 m²·g^-1. They also showed red photoluminescence at room temperature and had a high capacity and good Li-ion insertion/extraction properties for use in lithium ion batteries.

Key words: Porous silicon, Template-confined, Magnesiothermic reduction, Aerogel, High specific surface area

CHEN Ke, BAO Zhi-Hao, LIU Dong, ZHU Xiu-Rong, ZHANG Zhi-Hua, ZHOU Bin. Confined Synthesis and Properties of Porous Silicon from Silica Aerogel Templates by Magnesiothermic Reduction[J]. Acta Phys. -Chim. Sin. 2011, 27(11), 2719-2725. doi: 10.3866/PKU.WHXB20111110

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Confined Synthesis and Properties of Porous Silicon from Silica Aerogel Templates by Magnesiothermic Reduction

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