Manganese tetraoxide nanocrystal@3D honeycomb graded porous network framework carbon composite material as well as preparation and application thereof
A carbon composite material, hierarchical porous technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of insufficient bonding strength of carbon nanotubes, small specific surface area of stainless steel mesh, and cost of carbon nanotubes High-level problems, to achieve the effect of improving high-current charge and discharge performance, improving cycle performance, and low price
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Embodiment 1
[0031] (1) 170mg of SiO with a diameter of 20nm 2 Nanospheres, 30 mg of SiO with a diameter of 350 nm 2 Add 2000mg polyvinylpyrrolidone (PVP, molecular weight 58000) into 50mL ethanol, ultrasonically disperse and stir for 60min. The solution is then heated rapidly to a boil and kept at a boil until dry. The product was heated to 700°C for 2h under the protection of argon. The carbonized product is dispersed in 500mL of 2mol L -1 NaOH aqueous solution, heated to 80°C, stirred and reacted for 6h, then centrifuged, washed several times with deionized water, and dried at 80°C to obtain a 3D honeycomb hierarchical porous network framework carbon;
[0032] (2) 30 mg of 3D honeycomb hierarchical porous network framework carbon was ultrasonically dispersed in 30 mL of deionized water, and 94.8 mg of KMnO was added under stirring 4 and 85.2mg Na 2 SO 4 , reacted at room temperature for 6 hours, centrifuged the product, washed several times with deionized water, and dried at 80°C....
Embodiment 2
[0039] (1) 170mg of SiO with a diameter of 20nm 2 Nanospheres, 30 mg of SiO with a diameter of 350 nm 2 Add 2000mg polyvinylpyrrolidone (PVP, molecular weight 58000) into 50mL ethanol, ultrasonically disperse and stir for 60min. The solution is then heated rapidly to a boil and kept at a boil until dry. The product was heated to 700°C for 2h under the protection of argon. The carbonized product is dispersed in 500mL of 2mol L -1 NaOH aqueous solution, heated to 80°C, stirred and reacted for 6h, then centrifuged, washed several times with deionized water, and dried at 80°C to obtain a 3D honeycomb hierarchical porous network framework carbon;
[0040] (2) 30 mg of 3D honeycomb hierarchical porous network framework carbon was ultrasonically dispersed in 30 mL of deionized water, and 94.8 mg of KMnO was added under stirring 4 and 85.2mg Na 2 SO 4 , reacted at room temperature for 6 hours, centrifuged the product, washed several times with deionized water, and dried at 80°C....
Embodiment 3
[0044] (1) 170mg of SiO with a diameter of 20nm 2 Nanospheres, 30 mg of SiO with a diameter of 350 nm 2 Add 2000mg polyvinylpyrrolidone (PVP, molecular weight 58000) into 50mL ethanol, ultrasonically disperse and stir for 60min. The solution is then heated rapidly to a boil and kept at a boil until dry. The product was heated to 700°C for 2h under the protection of argon. The carbonized product is dispersed in 500mL of 2mol L -1 NaOH aqueous solution, heated to 80°C, stirred and reacted for 6h, then centrifuged, washed several times with deionized water, and dried at 80°C to obtain a 3D honeycomb hierarchical porous network framework carbon;
[0045] (2) 30 mg of 3D honeycomb hierarchical porous network framework carbon was ultrasonically dispersed in 30 mL of deionized water, and 47.4 mg of KMnO was added under stirring 4 and 42.6mg Na 2 SO 4 , reacted at room temperature for 6 hours, centrifuged the product, washed several times with deionized water, and dried at 80°C....
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