Growth-Oriented Fe-Based MOFs Synergized with Graphene Aerogels for High-Performance Supercapacitors

Metal–organic frameworks (MOFs) and graphene aerogels (GAs) are both considered as good candidates for high-performance supercapacitors. In this work, a growth-oriented Fe-based MOF synergized with GA composite for supercapacitor is prepared. MIL-88-Fe is in situ grown at (002) lattice plane on the surface of graphene via a one-step solvothermal method. Long periodic hexagonal structure and electrophilicity of MOF provide strong p–π interaction with graphene sheets. By utilizing the abundant interspace of GA, the existence of MOF could affect the electric double-layer characteristics of composites. The MOF/GA composites have the advantages of high capacitive volume, fast charge/discharge rate, and reliable cycling stability. The specific capacitance is as high as 353 F g −1 at the scan rate of 20 A g −1 , and the retention ratio is 74.4% after 10 000 cycles.