摘要
利用低温水热法在碳布(CC)表面一步法生长MnO_2纳米颗粒,通过控制水热反应时间,制备了一系列MnO_2/碳布复合材料.通过场发射扫描电子显微镜、X射线衍射、拉曼光谱、X射线光电子能谱分析了不同复合材料的形貌与结构,同时利用恒流充放电、循环伏安、交流阻抗方法对所制备的复合材料进行了电化学性能的测试.结果表明,碳布表面的性质和反应时间对MnO_2生长形貌和厚度具有一定的影响,从而造成复合材料电化学性能的改变.电化学性能测试显示,经0.50h反应所得的MnO_2/碳布复合材料在0.2 mA/cm^2充放电电流下,面积比电容达到76.9 mF/cm^2,经过1 700次循环测试后其面积比电容仍保留原来的89%.以碳布为基材大大缩短了离子传输和电荷转移路径,从而使得复合材料呈现良好的电化学性能.
Nano-structured manganese dioxide（MnO_2）was grown directly on the treated carbon cloth through a simple low temperature hydrothermal method.Several MnO_2/carbon cloth composites were fabricated by changing the reaction time.The morphologies and structures of the composites MnO_2/carbon cloth were studied by field emission scanning electron microscopy（FESEM）,X-ray diffraction（XRD）,Raman,and X-ray photoelectron spectroscopy（XPS）.And the electrochemical properties of the composites were investigated by galvanostatic charge-discharge,cyclic voltammograms（CV）,and electrochemical impedance spectroscopy（EIS）.The results show that the surface properties of carbon cloth and the reaction time have great effects on the morphologies and thickness of the obtained MnO_2 layers.With the reaction time of 0.50 h,the fabricated MnO_2/carbon cloth composites demonstrated a high specific capacitance of 76.9 mF/cm^2 at a current density of 0.2 mA/cm^2,and the specific capacitance still remained about 89% of its initial value after continuous 1 700 charge/discharge cycles.The good electrochemical performance of the composites is attributed to the short ion diffusion path and good electron transport environment offered by the substrate of carbon cloth.
出处
《东华大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第2期167-172,197,共7页
Journal of Donghua University(Natural Science)
基金
中央高校基本科研业务费专项资金资助项目(2232014D3-09)
教育部博士点基金资助项目(20130075120018)
关键词
碳布
MNO2
水热法
复合材料
电化学性能
超级电容器
carbon cloth
MnO2
hydrothermal method
composite
electrochemical properties
supercapacitor
