物理化学学报 >> 2011, Vol. 27 >> Issue (11): 2719-2725.doi: 10.3866/PKU.WHXB20111110

材料物理化学 上一篇    下一篇

多孔硅的模板限制镁热还原法制备及性能

陈珂, 包志豪, 刘冬, 朱秀榕, 张志华, 周斌   

  1. 同济大学, 上海市特殊人工微结构材料与技术重点实验室, 上海 200092
  • 收稿日期:2011-07-18 修回日期:2011-08-25 发布日期:2011-10-27
  • 通讯作者: 周斌 E-mail:zhoubin863@tongji.edu.cn
  • 基金资助:

    国家自然科学基金(51072137, 50802064), 国家科技支撑计划(2009BAC62B02), 教育部新世纪优秀人才支持计划(NCET-08-0405)和教育部博士点基金(20090072110047, 20100072110054)资助项目

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

CHEN Ke, BAO Zhi-Hao, LIU Dong, ZHU Xiu-Rong, ZHANG Zhi-Hua, ZHOU Bin   

  1. Shanghai Key Laboratory of Special Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. China
  • Received:2011-07-18 Revised:2011-08-25 Published:2011-10-27
  • Contact: ZHOU Bin E-mail:zhoubin863@tongji.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51072137, 50802064), National Science & Technology Pillar Program, China (2009BAC62B02), Program for New Century Excellent Talents in University, China (NCET-08-0405), and Research Fund for the Doctoral Program of Ministry of Education of China (20090072110047, 20100072110054).

摘要: 采用一种基于气-固反应机制的模板限制镁热还原法, 以SiO2气凝胶为模板在低温(650°C)下制备出一种高比表面积纳米多孔硅材料. 利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)和比表面积(BET)分析等表征手段对样品的成分、物相结构、微观形貌和孔结构进行分析, 并初步研究了材料的光学特性和电化学性能. 结果表明, 产物为纳米硅晶体颗粒组成的多孔结构, 保留了与原始气凝胶模板相似的微观形貌, 比表面积高达602 m2·g-1. 该材料在室温下表现出显著的红光光致发光特性, 且具有较高的储锂容量和较好的嵌入/脱出锂性能.

关键词: 多孔硅, 模板限制, 镁热还原, 气凝胶, 高比表面积

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

MSC2000: 

  • O643