碳布负载WO3@C纳米复合材料的制备及其超级电容器电化学性能

Synthesis and electrochemical performance of WO3@C composite material on carbon cloth in supercapcacitors

电极材料作为超级电容器的重要组成部分之一,是影响其电化学性能的关键.以碳布为基底,采用溶剂热法并结合高温热处理,在碳布表面原位构建层状WO3@C纳米复合材料,并将其直接用于超级电容器工作电极进行电化学性能分析.采用扫描电子显微镜(SEM)、X-射线衍射(XRD)、拉曼光谱(Raman)等手段对所制备材料进行了形貌与结构表征,采用电化学工作站对其进行电化学性能测试.结果表明:该复合物成功制备并均匀生长于碳纤维布表面;作为电极材料在10 mV s-1的扫速下和2 A g-1的电流密度下比容量分别可以达到214.4 F g-1和192.0 F g-1;在2.0 A g-1的电流密度下进行10000次循环充放电后,复合电极的比容量保持率为124%,展现出良好的电化学稳定性,经过计算揭示出电荷存储的动力学过程主要受电容型的电荷存储行为控制.

As one of the important components of supercapacitor,electrode material is the key to influence its electrochemical performance.In this study,layered WO3@C composite material was constructed in situ on the surface of carbon cloth by solvent heat method combined with high temperature heat treatment,and was directly applied to the working electrode of supercapacitor for electrochemical performance analysis.Scanning electron microscopy(SEM),X-ray diffraction(XRD),Raman spectroscopy(Raman),electrochemical measurements and other means were used to characterize the morphology,structure and electrochemical properties of the as-prepared materials.Electrochemical performance was tested by electrochemical workstation and the results indicated that the composite was successfully prepared and grown uniformly on the surface of carbon fiber cloth.As the electrode material,the specific capacity is 214.4 F g-1 at the scanning rate is 10 mV s-1 and 192.0 F g-1 at the current density is 2 A g-1 respectively.The specific capacitance retention rate of the composite electrode is 124%after 10000 cycles of charge and discharge at the current density of 2 A g-1,showing good electrochemical stability.Through calculation,it is revealed that the corresponding dynamic process of charge storage is mainly controlled by capacitance-type charge storage behavior.