Sc掺杂钼酸钴/碳纤维复合材料的制备及其电容性能

Preparation and Capacitive Properties of Sc-Doped Cobalt Molybdate/Carbon Fiber Composites

采用常温搅拌法在碳布导电基底上制备了钪(Sc)元素掺杂的钼酸钴/碳纤维复合材料(Sc-CoMoO_(4)/CF),通过对材料进行表征测试,发现所制备的产物为多孔片状结构。这种多孔片状结构增加了材料的比表面积,有利于缩短离子和电子的扩散路径。运用X射线衍射、扫描电镜、透射电子显微镜方法对样品进行分析,研究了Sc元素掺杂对材料稳定性的影响。结果表明,制得的Sc-CoMoO_(4)/CF电极材料没有其他杂质峰,也没有其他杂质元素存在,这表明样品纯度较高。同时,对Sc-CoMoO_(4)/CF电极材料进行了电化学性能的研究。在电流密度为1 A/g的条件下,Sc-CoMoO_(4)/CF电极材料的比电容为2 095 F/g,在100次循环后,其比电容达到2 080 F/g,是初始值的99.3%,这表明电极材料具有良好的稳定性。在对Sc-CoMoO_(4)/CF//CNTs器件进行循环稳定性试验中,当电流密度为1 A/g时,比电容为176 F/g,进行10 000次循环充放电测试后,比电容变为162 F/g,与初始比电容相比变化不大,达到初始值的92%,这说明其具有较高的充放电性能和较高的循环稳定性。

Scandium doped cobalt molybdate/carbon fiber composites(Sc-CoMoO_(4)/CF)were prepared on a conductive substrate composed of carbon cloth using room temperature stirring method.Through character⁃ization testing of the materials,it was found that the prepared product was a porous sheet-like structure.This porous sheet-like structure increased the specific surface area of the material,which was beneficial for shortening the diffusion paths of ions and electrons.The samples were analyzed using X-ray diffraction,scanning electron microscope,and transmission electron microscope methods,and the effect of Sc element doping on material stability was studied.The results indicate that the Sc-CoMoO_(4)/CF electrode material pre⁃pared in the experiment has no other impurity peaks or other impurity elements present which indicating a high purity of the sample.Meanwhile,the electrochemical performance of Sc-CoMoO_(4)/CF electrode materi⁃al was studied.Under the condition of current density of 1 A/g,the specific capacitance of Sc CoMoO_(4)/CF electrode material is 2095 F/g.After 100 cycles,its specific capacitance reaches 2080 F/g,which is 99.3%of the initial value which indicating that the electrode material has good stability.In the cycling stabil⁃ity experiment of Sc-CoMoO_(4)/CF//CNTs devices,when the current density is 1 A/g,the specific capacitance is 176 F/g.After 10000 cycles of charge and discharge testing,the specific capacitance becomes 162 F/g,which is not significantly different from the initial specific capacity,reaching 92%of the initial value which indicating that it has high charge and discharge performance and high cycling stability.