Metal–organic frameworks (MOFs) are promising precursors to prepare heteroatom-doped porous carbon for high-performance supercapacitor. N-self-doped graphitic carbon aerogels (NGCA) with hierarchically porous tunnels, high graphitization degree, high N content and 3D conductive network structure are successfully prepared by dry-freezing and successive high temperature treatment of ZIF-8/carboxymethylcellulose (CMC)/potassium ferrate (K₂FeO₄) composites, using CMC as continuous carbon agent for MOFs-derived carbon and K₂FeO₄ as both activation agent and catalyst. When applied in a supercapacitor, the obtained NGCA exhibit excellent capacitive performance and remarkable energy-power characteristics. The specific capacitance of NGCA electrode is 244 F/g at 1 A/g in three-electrode system. NGCA based symmetric supercapacitor shows a high energy density of 17.08 Wh/kg at a power density of 500 W/kg. These results confirm NGCA as electrode material can be applied for high-performance supercapacitor.

金属有机骨架（MOF）是有前途的前驱体，可以制备杂原子掺杂的多孔碳，用于高性能超级电容器。通过对ZIF-8 /羧甲基纤维素（CMC）/进行冷冻干燥和连续高温处理，成功制备了具有分层多孔隧道，高石墨化度，高N含量和3D导电网络结构的N自掺杂石墨碳气凝胶（NGCA）/高锰酸钾（K ₂ FeO ₄）复合材料，使用CMC作为MOF衍生碳和K ₂ FeO _4的连续碳剂作为活化剂和催化剂。当用于超级电容器中时，所获得的NGCA表现出优异的电容性能和卓越的能量-功率特性。在三电极系统中，NGCA电极的比电容在1 A / g时为244 F / g。基于NGCA的对称超级电容器在500 W / kg的功率密度下显示出17.08 Wh / kg的高能量密度。这些结果证实了NGCA作为电极材料可用于高性能超级电容器。