Preparation method of sandwich structure cobalt-nickel alloy particles/reduced graphene composites
A technology of cobalt-nickel alloys and composite materials, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of narrow absorption band application, general wave absorption performance, poor dispersion, etc., and achieve good absorption effect, low cost, good quality absorption effect
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Embodiment 1
[0027] (1) Size-tunable cobalt-nickel alloy particles / reduced graphene composite rGO / CN with sandwich structure 4 -0.2:
[0028] First, at room temperature, 40 mg of graphene oxide was ultrasonically dispersed in 20 mL of ethylene glycol for 30 min, and then 0.05 g of cobalt acetate and 0.2 g of nickel acetate were added and dissolved in sequence, and then Slowly add 20 mL of ethylene glycol (PH acidic) dissolved with 0.125 g of citric acid dropwise at a rate of 10 seconds / drop. Pour the above solution into the reaction kettle, heat to 210°C, and react for 13 h;
[0029] After the hydrothermal kettle is cooled, it is washed several times with deionized water and absolute ethanol, centrifuged, and then dried in a freeze dryer for 24 hours to finally obtain cobalt-nickel alloy particles with a sandwich structure and an average size of 0.2 μm / Reduced graphene composite rGO / CN 4 -0.2.
Embodiment 2
[0031] (2) Size-tunable cobalt-nickel alloy particles / reduced graphene composite rGO / CN with sandwich structure 4 Synthesis of -0.5:
[0032] First, 40 mg of graphene oxide was ultrasonically dispersed in 10 mL of ethylene glycol and 10 mL of ethylene glycol at room temperature for 30 min, and then 0.05 g of cobalt acetate and 0.2 g of Nickel acetate was dissolved separately, and then a mixed solution of 10 mL of ethylene glycol and 10 mL of ethylene glycol dissolved in 0.12 g of sodium hydroxide was slowly added dropwise at a rate of 10 seconds / drop. Pour the above solution into the reaction kettle, heat to 210°C, and react for 13 h;
[0033] After the hydrothermal kettle was cooled, it was washed several times with deionized water and absolute ethanol, then centrifuged, and then dried in a freeze dryer for 24 hours to finally obtain cobalt with a sandwich structure and an average particle size of about 0.5 µm. Nickel alloy particles / reduced graphene composite rGO / CN 4 -0....
Embodiment 3
[0035] (3) Size-tunable cobalt-nickel alloy particles / reduced graphene composite rGO / CN with sandwich structure 4 Synthesis of -0.8:
[0036] First, at room temperature, 40 mg of graphene oxide was ultrasonically dispersed in 20 mL of ethylene glycol for 30 min, and then 0.02 g of cobalt acetate and 0.08 g of nickel acetate were added and dissolved in sequence, and then Slowly add 20 mL of ethylene glycol (PH is alkaline) dissolved with 0.12 g of sodium hydroxide dropwise at a rate of 10 seconds / drop. Pour the above solution into the reactor, heat to 210 °C, and react for 13 h;
[0037] After the hydrothermal kettle is cooled, it is washed several times with deionized water and absolute ethanol, centrifuged, and then dried in a freeze dryer for 24 hours to finally obtain cobalt-nickel with a sandwich structure and an average particle size of about 0.8 μm. Alloy particle / reduced graphene composite rGO / CN 4 -0.8.
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