新颖三维超结构功能材料:SnO_2@Carbon核-壳纳米链的合成与储能应用  

Synthesis of Novel 3-D Superstructure of SnO_2@Carbon Nanochains Functional Materials and Application

作　　者：方岳平[1,2] 周训富[1] 杨思源[1] 王红强[2] 

机构地区：[1]华南农业大学生物材料研究所,广东广州510642 [2]广西师范大学化学化工学院,广西桂林541004

出　　处：《广西师范大学学报（自然科学版）》2012年第3期178-188,共11页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(20963002;21173088;21105030;51064004)

摘　　要：首次以锡酸钠和葡萄糖为原料利用水热法成功合成了由碳包覆二氧化锡(SnO2@C)纳米链形成的多环三维(3-D)超结构材料。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线粉末衍射仪(XRD)和拉曼测试仪(Raman)对样品进行了表征。将8nm厚的碳包覆二氧化锡纳米链(SCNCs)试样用于锂离子电池负极材料上,电流为300mA.g-1时其可逆放电容量大于760mAh.g-1,100次充放电后还能保持85%的容量。通过原位合成在SCNCs表面负载Pt、Ru纳米粒子,用于甲醇的氧化,具有优越的电化学催化活性。3-D architectures based on SnO2@C nanochains assembled into multi-rings have been synthesized on a large scale using low-cost starting materials of stannate and glucose.The products were characterized by scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,X-ray powder diffraction（XRD） and Raman tester（Raman）.SCNCs with about 8 nm carbon shell synthesized by optimized routes were demonstrated for optimal electrochemical performances as anodes for lithium-ion batteries.More than 760 mAh·g-1 of reversible discharge capacity was achieved at a current density of 300 mA·g-1,and above 85% retention can be obtained after 100 charge-discharge cycles.PtRu nanoparticles were synthesized in situ on the carbon surface of SnO2@C nanochains.The as-prepared samples were applied to methanol oxidation,showing excellent electrochemical catalytic activity.

关 键 词：水热法 SnO2@C 核壳纳米链 电化学 

分 类 号：O641[理学—物理化学]