二氧化锡填充多壁碳纳米管材料的制备及电化学性能

Preparation and Electrochemical Performance of Tin-Dioxide Filled Multi-Walled Carbon Nanotubes

用硝酸氧化法处理多壁碳纳米管(MWCNTs),使得MWCNTs端口打开,长度变短,表面得到改性.通过二氯化锡与硝酸银反应,过滤后的溶液在浓硝酸环境中,Sn2+在毛细作用下扩散进入碳纳米管管腔,吸附、成核并在热处理作用下沉积,从而制备出SnO2/MWCNTs纳米复合材料.XRD和TEM测试表明,部分SnO2填充到MWCNTs管腔,形成不连续的纳米颗粒.电化学测试表明,SnO2填充的MWCNTs可以结合两者的优势,使得复合材料的循环性能和比容量均有所改善.

Multi-walled carbon nanotubes （MWCNTs） were purified and chopped by nitric acid. Tin dioxide filled MWCNTs were prepared via a diffusion method. A tin dichloride solution was mixed with AgNO3, filtered and then MWCNTs were sonicated in the filtrate. After calcination in N2 atmosphere the salt filled in the MWCNTs decomposed to SnO2. Structural and morphological characterization of the composite material by X-ray diffraction （XRD） and transmission electron microscopy （TEM） showed that the MWCNTs were filled with discrete nano-SnO2 particles. Compared to pristine MWCNTs and purified-MWCNTs, the SnO2-filled MWCNTs exhibited high capacity and good cyclability during charge-discharge cycling. The SnOJMWCNTs nanocomposites showed better cyclability than pure SnO2 nano-materials.