以α-纤维素分散液为前驱体,采用简单的抽滤和热处理工艺制备多孔超薄碳膜.采用扫描电子显微镜、透射电子显微镜等方法对其结构进行了表征;采用循环伏安、恒流充放电、交流阻抗等方法研究了其电化学性能;并且研究了多级孔结构对所制备的碳膜电化学性能的影响.结果表明:制备的超薄多孔碳膜呈现多级孔结构,厚度约为1.5 μm,在电流密度为0.5 A·g-1时,容量达到169 F·g-1;在2 A·g-1的电流密度下,在循环5000圈后,可以保持80%的容量,同时库伦效率几乎保持100%.%A simple method combining extraction operation and thermo-treatment was applied to synthesize a ultra-thin porous carbon film by using α-cellulose solution as precursor.Scanning electron microscopy and transmission electron microscopy were used to characterize the structure porous carbon film,and cyclic voltammetry,charging-discharging tests and electrochemical impedance spectroscopy were used to test the electrochemical properties of the prepared film.The effect of the structure on the electrochemical performance was also investigated.The results showed that the prepared ultra-thin porous carbon film exhibits porous structure with thickness of about 1.5 μm.Moreover,the porous carbon film has a highest specific capacitance of 1 6 9 F·g-1at the current density of 0.5 A·g-1,and a capacitance retention of 80% at 2 A·g-1after 5 000 cycles.Notably,the Coulombic efficiency kept 100% simul-taneously during the process of cyclic charge-discharge.
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