▎ 摘　　要

To design and construct high-performance asymmetric supercapacitors (ASC), we use the same Fe-based metal-organic framework (MIL-88A) as the precursor for the first time to prepare iron-cobalt-nickel ternary metal hydroxides (Fe-Co-Ni-OH) and Fe2O3 compounded with reduced graphene oxide (Fe2O3/RGO-1). As a positive electrode, Fe-Co-Ni-OH has a specific capacitance of 1065 F g(-1) at 1 A g(-1) and exhibits excellent rate performance and cycle stability due to its unique spindle-like structure of the surface growth nanosheets and the synergistic effect between the three metals. The introduction of RGO effectively connects the independent spindle-like Fe(2)O(3)and enhances the conductivity and structural stability of the material. So that the Fe2O3/RGO-1 negative electrode has a specific capacitance of 734 F g(-1) at 1 A g(-1) , and its cycle stability is significantly improved compared with the single Fe2O3 (increasing from 64 % to 85 %). The constructed Fe-Co-Ni-OH//Fe2O3/RGO-1 ASC possesses a satisfactory energy density of 43.11 Wh kg(-1) at a power density of 800 W kg (-1) , which is superior to parts constructed with similar material compositions in the same period. This research provides a new perspective for developing high-performance, low-cost, and environmentally friendly green energy storage devices. (C) 2022 Elsevier Inc. All rights reserved.