TiO_2纳米纤维电极材料的制备及电化学性能

Preparation and Electrochemical Properties of TiO_2 Nanofiber Electrode Material

采用静电纺丝技术,以聚乙烯基吡咯烷酮(PVP)和钛酸四丁酯(TBT)为前驱体制备复合纳米纤维,经250℃预氧化,500℃碳化制得TiO2纳米纤维.通过扫描电镜(SEM)、X-射线衍射(XRD)进行分析测试表明:原丝表面光滑,直径分布均匀;碳化后纤维表面粗糙,出现明显收缩,纤维中TiO2形成稳定的锐钛矿晶型.对不同钛酸四丁酯(TBT)负载量的TiO2纳米纤维进行电化学性能表征,测试结果表明:在5 mv/s扫速下,CV曲线具有明显的氧化-还原峰;在1.0、2.0 A/g的充放电电流密度下,随负载量的增加,比容量也随之增加,表现出较好的电化学性能.

TiO2 nanofibers were preparaed from polyvinylpyrrolidone/tetrabutyl titanate（PVP/TBT） as precur- sor by an electrospinning technique, followed by pre-oxidation at 250℃and carbonization at 500℃. The re- sults obtained from scanning electron microscopy （SEM） and X-ray diffraction （XRD） analysis indicated that the surface of the precursor fibers is smooth, the diameter of the fibers is uniform and the surface of the fibers carbonized is rough with a certain degree of contraction, and the TiO2 in the fibers is stable anatase crystal type. The electrochemical performance test of TiO2 nanofibers with different TBT load shows that the CV curves displays redox peaks at the scan rate of 5 mv/s. With the increase of TBT load, the specific capacity is in- creased at the charge-discharge current density of 1.0 A/g and 2.0 A/g,which proves that the fibers exhibited a good electrochemical performance.