多孔二氧化锰/鱼鳞衍生碳复合材料的制备及超级电容器性能研究

Fabrication and supercapacitor performance of porous manganese dioxide/fish-scale-derived carbon composites

利用碳化-酸洗方法将天然鱼鳞转化为多孔碳,进一步利用表面反应在碳基体上引入非晶二氧化锰,获得具有多孔结构的二氧化锰/鱼鳞衍生碳(MnO2/FSC)复合材料.采用场发射扫描电子显微镜、氮气吸附/脱附仪、X射线衍射仪、X射线光电子能谱和电化学工作站等对材料的形貌、结构、成分及电化学性能进行表征.结果表明,反应时间为1.0 h时所制备的MnO2/FSC具有最高的比容量(181 F/g,1 A/g),且持续恒流充放电700个循环后容量基本没有衰减,表现出优异的循环稳定性.

Natural fish scales were transferred to porous carbon by carbonization-acid rinsing method.After that,amorphous manganese dioxide was introduced on the carbon substrate by surface reaction to obtain manganese dioxide/fish-scale-derived carbon(MnO2/FSC)composites.Field emission scanning electron microscope,nitrogen adsorption/desorption,X-ray diffraction,X-ray photoelectron spectroscopy,electrochemical workstation,etc.were employed to characterize the morphology,structure,composition and electrochemical performance of materials.The results demonstrate that the optimal surface reaction time to obtain MnO2/FSC is 1.0 h,which lead to the highest specific capacitance(181 F/g,1 A/g)and excellent cycling stability with no obvious capacity fading after 700 charge/discharge cycles.