Tuning MOF-Derived Co3O4/NiCo2O4 Nanostructures for High-Performance Energy Storage

Highly porous Co3O4/NiCo2O4 nanostructures were synthesized using zeolitic imidazolate framework-67 (ZIF-67) nanocrystals. The oxide composite structure was adjusted by modifying ZIF-67 crystallite size and the pore structure by the coordination modulation method. After forming the zeolite imidazolate framework-67 (ZIF-67)/Ni-Co layered double hydroxide intermediate composite through reaction with nickel nitrate, the intermediate composite was heated in air to result in Co3O4/NiCo2O4. Nitrogen adsorption was used for pore structure characterization of the template and resultant oxide composite. The maximum capacitance of nanostructured Co3O4/NiCo2O4 was 770 F g(-1) at a discharge current density of 1 A g(-1) with acceptable cycle stability, maintaining 70% of the initial capacitance after 10,000 charge-discharge cycles.

Automated summary

Highly porous Co3O4/NiCo2O4 nanostructures were synthesized by adjusting the oxide composite structure through modifications in ZIF-67 crystallite size and pore structure using the coordination modulation method. The nanostructured Co3O4/NiCo2O4 exhibited a maximum capacitance of 770 F g(-1) with good cycle stability, maintaining 70% of the initial capacitance after 10,000 charge-discharge cycles.