原位生长Fe-MOFs于单壁碳纳米角基质中合成分级Fe2O3@C/SWCNH复合材料用于超级电容器

The hierarchical Fe 2 O 3 @C/SWCNH composite has been synthesized through in situ growth of iron-based metal organic frameworks (Fe-MOFs) in the matrix of single-walled carbon nanohorns (SWCNHs) using solvothermal method and high temperature calcination process. Compared with Fe 2 O 3 @C, SWCNHs, and previously reported Fe 2 O 3 /C-based electrode materials, Fe 2 O 3 @C/SWCNH composite displays superior electrochemical performance, exhibiting a high specific capacitance of 293.9 F/g at the current density of 0.5 A/g and superior rate capability. After 1000 cycles of charge–discharge cycles at the current density of 1 A/g, 80.6% of the specific capacitance is retained, showing good long-term cycling stability. The excellent electrochemical performance is attributed to the hierarchical porous structure of the composite, and synergistic effect of electrical double-layer capacitor and pseudocapacitor arising from SWCNHs and Fe 2 O 3 @C, enabling Fe 2 O 3 @C/SWCNH composite a promising candidate for energy storage applications.