双金属MOF基复合结构材料及其超级电容器性能

Double metal MOF-based composite structure and performance as supercapacitor electrode

超级电容器作为一种新型储能原件,具有功率密度高和可快速充放电等优点。本文通过溶剂热法制备了铁锰双金属有机框架材料(Fe Mn-MOF),并将其作为前驱体,经过高温热处理后,得到碳和金属氧化物的复合结构材料(C-MOF)。采用傅里叶变换红外光谱仪、X射线衍射仪和场发射扫描电子显微镜对制备得到的材料进行了结构表征,将高温处理后的材料作为电极材料应用于超级电容器,并对其进行了一系列的化学测试。当电流密度为0.5 A/g时,C-MOF基超级电容器的比容量最高可达388.9 F/g,C-MOF基超级电容器的比容量最高可达388.9 F/g。在2 A/g的电流密度下循环5000次后,比容量为初始值的201.5%,说明在循环的过程中C-MOF电极不仅具有良好的循环稳定性,还存在一个活化过程使其比容量增加。这将极大地提高MOF基复合结构材料作为超级电容器电极材料的应用价值,同时也为双金属MOF材料的研究与应用提供了新的思路。

Supercapacitor has been recently evaluated as a new type of energy storage device because of its high energy density and the rapid charge/discharge.The niccolite-type MOF compound was synthesized by a facile solvothermal method.By thermal treatment at 800°C,the precursor FeMn-MOF was calcinated to the complex structure C-MOF.FTIR Spectroscopy,XRD and SEM were used to characterize the structure of samples.The electrochemical properties of the supercapacitor applying C-MOF as the electrode material were measured.Results show that the specific capacitance of C-MOF electrode reaches 388.9 F-g_1 at the current density of 0.5 A-g_1.Furthermore,the capacitance retention is up to 201.5%after 5000 cycles at current density of 2 A-g_1 compared with the initial specific capacitance.It indicates not only a good electrochemical stability but also an activation process of C-MOF electrode.This research not only broadens the application field of MOF material but also promotes the application value of MOF based composites as the electrode material of supercapacitor.