posted on 2021-02-04, 19:04authored byAli Rashti, Xiner Lu, Alex Dobson, Ehsan Hassani, Farshad Feyzbar-Khalkhali-Nejad, Kai He, Tae-Sik Oh
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.