【摘要】 利用高比表面积、大孔隙率金属有机骨架材料（metal-organic frameworks, MOFs）作为牺牲模板,制备了MOFs（ZIF-8）衍生多孔碳材料（PCs）,以其作为导电基底,在表面生长金属氧化物MnO₂,获得MnO₂/PCs复合材料并将其应用在超级电容器中.制备的复合材料具有良好的电化学电容性能,在三电极体系中,1 A·g^-1的电流密度下比电容可达199 F·g^-1,经过2 000次充放电循环后,比电容仍能保持初始值的80%.使用MnO₂/PCs复合材料作为正极,PCs作为负极,组成的非对称型电容器MnO₂/PCs//PCs具有优异的电化学储能性能,在950 W·kg^-1的功率密度下,能量密度高达10.16 Wh·kg^-1;而且当功率密度上升为9 500 W·kg^-1时,能量密度仍可以保持4.48 Wh·kg^-1.更多还原

【Abstract】 In this paper,MOFs-derived porous carbon materials（PCs） are prepared by serving metal-organic frameworks（MOFs） with high specific surface area and large porosity as sacrificial templates,and then the resultant PCs is used as conductive substrate to grow metal oxide MnO₂ on its surface to form MnO₂/PCs composite for electrode materials of supercapacitors.The as-prepared composite shows good electrochemical capacitance performances.The experimental results show that under the three-electrode system,the specific capacitance can reach 199 F·g^-1 at a current density of 1 A·g^-1.After 2 000 charge and discharge cycles,the specific capacitance can still maintain 80% of the initial value.We use MnO₂/PCs composite as positive electrode and PCs as negative electrode to assemble an asymmetric capacitor MnO₂/PCs//PCs.The resulting device（MnO₂/PCs//PCs） achieves an energy density of 10.16 Wh·kg^-1 at a power density of 950 W·kg^-1 and it still retains a value of 4.48 Wh·kg^-1 at 9 500 W·kg^-1.更多还原