基于MOFs和酚醛泡沫的多孔碳泡沫电容性能

A Porous Carbon Foam Derived from MOFs and Phenolic Foam and Its Capacitive Performance

以酚醛泡沫为碳源,金属有机框架材料Cu-MOF-199为掺杂剂,经过高温碳化制备了一种电容性能优良、循环稳定性强的多孔碳泡沫。采用热重-差示扫描量热法(TG-DSC)、X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、氮气吸脱附测试等技术对材料的结构和形貌进行分析,采用循环伏安法(CV)、恒电流充放电(GCD)及电化学阻抗谱(EIS)等方法对材料的电化学性能与循环性能进行测试。结果表明,一定量Cu-MOF-199的引入可明显提升多孔碳泡沫的电容性能,在1 A·g^-1时可达169 F·g^-1,20 A·g^-1时仍高达123 F·g^-1,2 500次循环(1 A·g^-1)后仍有97%的电容量。

With the phenolic foam as the carbon source and a metal-organic frameworks Cu-MOF-199 as the dopant, a porous carbon foam with the high capacitive performance and cyclability stability was prepared by the high-temperature carbonization.Thermal analysis-differential scanning calorimetry(TG-DSC), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM) and N2 adsorption-desorption were employed to characterize the composition, structure and morphology of the prepared material. The electrochemical properties of the material were tested by cyclic voltammetry(CV), galvanostatic charge-discharge method(GCD) and electrochemical impedance spectroscopy(EIS). The results demonstrate that the incorporation of Cu-MOF-199 can conspicuously promote the capacitive performance. The specific capacitance could reach 169 F·g^-1 at 1 A·g^-1 and 123 F·g^-1 at 20 A·g^-1, respectively. Meanwhile the carbon foam maintains 97% retention after 2 500-cycle GCD test at 1 A·g^-1.