ZIF-67/graphene oxide and preparation method of hollow Co3O4/graphene from ZIF-67/graphene oxide by pyrolysis

Abstract

The invention discloses ZIF-67/graphene oxide and a preparation method of hollow Co3O4/graphene from ZIF-67/graphene oxide by pyrolysis. The method comprises the following steps: step 1, cobalt nitrate is dissolved in an aqueous graphene oxide solution and subjected to ultrasonic dispersion, and an ultrasonic dispersion solution is obtained; step 2, the ultrasonic dispersion solution is poured into a dimethylimidazole solution and stirred uniformly, then centrifugation, washing and drying are performed, and a ZIF-67/graphene oxide composite is obtained; step 3, the ZIF-67/graphene oxide composite is subjected to pyrolysis treatment, and a Co3O4/graphene composite with a hollow structure is obtained. Through combination with the dispersity of graphene oxide, the ZIF-67/graphene oxide composite is obtained by adopting water as a solvent through simple precipitation reaction, the Co3O4/graphene composite with uniform distribution is obtained through a controlled pyrolysis and oxidation process by adopting ZIF-67/graphene oxide as a precursor, the defects that ZIF-67 particles obtained by adopting methanol as a solvent are large and non-uniformly composited in the prior art are overcome, and the method has the advantages of simple process, low cost, easily controlled reaction process and the like and is suitable for large-scale industrial production.

Description

technical field The invention relates to the field of material science research, in particular to a ZIF-67 / graphene oxide and its pyrolysis to obtain hollow Co 3 o 4 / The preparation method of graphene. Background technique Composite material technology can give full play to the advantages of the two materials, successfully avoid the defects of a single material, and produce synergistic effects. The imidazole metal-organic framework ZIF-67 has the advantages of high specific surface area, high porosity, easy functionalization and high thermal stability, while graphene has rich functional groups and large interlayer spacing, so domestic and foreign researchers Composite ZIF-67 and graphene oxide and develop their functional applications as precursors. However, most of the methods for synthesizing ZIF-67 are carried out in methanol. However, the dispersion of graphene oxide in methanol is poor, which makes the composite of ZIF-67 and graphene oxide uneven and the obtained Z...

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Problems solved by technology

However, most of the methods for synthesizing ZIF-67 are carried out in methanol. However, the dispersion of graphene oxide in methanol is poor, which makes the composite of ZIF-67 and graphene oxide uneven and the obtained ZIF-67 particles are large, which ultimately affects the composite material. Performance

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