Preparation method and application of mesoporous-structured urchin-shaped NiCo2O4/three-dimensionally constructed graphene microsphere composite material
A mesoporous structure and graphene technology, applied in structural parts, chemical instruments and methods, nickel compounds, etc., can solve the problems of small ion transmission channels, difficult storage and use, and inapplicability
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Embodiment 1
[0034] Preparation of hydrophilic stereostructured graphene. Put 1g of stereostructured graphene into 80mL polytetrafluoroethylene-lined hydrothermal reaction kettle, add 40mL of nitric acid with a concentration of 68wt%, and react at 120°C for 24h. After the reaction was finished, it was naturally cooled to room temperature, and the obtained product was suction-filtered with a No. 6 sand core funnel, washed alternately with deionized water and absolute ethanol for 6 times, and then dried in a vacuum oven at 60°C for 5 hours to obtain a hydrophilic Unique three-dimensional structure of graphene powder. The product was analyzed by SEM, which confirmed that its structure was a three-dimensional structure; by XPS analysis, it was confirmed that there was sp in the obtained product. 2 C: The water dispersibility experiment was carried out on this product, showing that its hydrophilicity was significantly improved compared with the three-dimensional graphene before treatment with ...
Embodiment 2
[0036] Preparation of mesoporous sea urchin-like NiCo 2 o 4 . 0.8724 g of 0.003 mol nickel nitrate hexahydrate, 1.7462 g of 0.006 mol cobalt nitrate hexahydrate, 2.1622 g of 0.036 mol urea, and 2 mL of polyethylene glycol-400 were dissolved in 60 mL of deionized water. The resulting solution was transferred to a 100 mL polytetrafluoroethylene-lined hydrothermal reactor and heated at 95 °C for 8 h. After cooling to room temperature, the precipitate was collected by suction filtration with a No. 6 sand core funnel, and washed three times alternately with deionized water and absolute ethanol. Dry the precipitate in a vacuum oven at 60°C for 4 hours to obtain NiCo 2 o 4 Precursor. NiCo 2 o 4 Precursor in air, 2min -1 The heating rate was calcined at 300°C for 2h to obtain the mesoporous sea urchin-like NiCo 2 o 4 , sea urchin-like NiCo 2 o 4 The pore diameter and specific surface area are 3.98nm and 125.71m 2 g –1 . The prepared mesoporous sea urchin-like NiCo 2 o...
Embodiment 3
[0038] Preparation of mesoporous sea urchin-like NiCo 2 o 4 / Three-dimensional construction of graphene microspheres. 0.8724g of 0.003mol nickel nitrate hexahydrate, 1.7462g of 0.006mol cobalt nitrate hexahydrate, 2.1622g of 0.036mol urea, 100mg of hydrophilic three-dimensional graphene, 2mL of polyethylene glycol-400 ultrasonically dispersed in 60mL to ionized water. The resulting mixture was transferred to a 100 mL polytetrafluoroethylene-lined hydrothermal reactor and heated at 95 °C for 8 h. After cooling to room temperature, the precipitate was collected by suction filtration with a No. 6 sand core funnel, and washed three times alternately with deionized water and absolute ethanol. Dry the precipitate in a vacuum oven at 60°C for 4 hours to obtain NiCo 2 o 4 / Precursors for three-dimensional construction of graphene. NiCo 2 o 4 / three-dimensional structure graphene precursor in air atmosphere, with 2min -1 The heating rate was calcined at 300°C for 2h to obta...
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