A double-shell core-shell structure of fe 3 o 4 @c@mno 2 Composite material and its preparation method
A composite material, core-shell structure technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., can solve problems such as low specific capacitance
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[0060] As introduced in the background technology, Fe in the prior art 3 o 4 The @C composite material has the disadvantage of low specific capacitance. In order to solve the above technical problems, the present invention provides a double-shell core-shell structure Fe 3 o 4 @C@MnO 2 Composite material and preparation method thereof, concrete steps are as follows:
[0061] (1) Preparation of spherical Fe by solvothermal method 3 o 4
[0062] ① Separately FeCl 3 ·6H 2 O, Na 3 Cit, NaOAc were dissolved in the mixed solution of ethylene glycol and diethylene glycol, stirred at room temperature for 30min;
[0063] ②Transfer the mixed solution prepared in step ① into the autoclave, keep it warm at 180-220°C for 10-14h, and cool the autoclave to room temperature after heat treatment to obtain the precipitate;
[0064] ③ Centrifuge the precipitate obtained in step ②, wash and dry to obtain spherical Fe 3 o 4 , spherical Fe 3 o 4 The diameter is 200-250nm.
[0065] Among...
Embodiment 1
[0085] Preparation of spherical Fe 3 o 4 Sequentially add 1.08g FeCl 3 ·6H 2 O, 0.25gNa 3 Cit, 1.6gNaOAc were dissolved in a beaker containing 40mL ethylene glycol and 10mL diethylene glycol, and the beaker was placed on a magnetic stirrer for 30min stirring to obtain a mixed solution, and then the mixed solution was transferred to a polytetrafluoroethylene-lined autoclave In the process, tighten the reactor and put it in an oven, keep it warm at 200°C for 12 hours, and cool the autoclave to room temperature naturally after solvent heat treatment to obtain a precipitate; after centrifuging the obtained precipitate, use ethanol and secondary water Spherical Fe was obtained after washing, centrifuging and drying 3 o 4 particles.
[0086] Preparation of Fe 3 o 4 @SiO 2 Composite particles Put 0.1g Fe in a 250mL beaker 3 o 4 , 80mL ethanol, 20mL water, mechanically stirred for 10min until Fe 3 o 4 The particles are evenly dispersed in the solution, then use a pipette...
Embodiment 2
[0092] Preparation of spherical Fe 3 o 4 Sequentially add 1.08g FeCl 3 ·6H 2 O, 0.25gNa 3 Cit, 1.6gNaOAc were dissolved in a beaker containing 40mL ethylene glycol and 10mL diethylene glycol, and the beaker was placed on a magnetic stirrer for 30min stirring to obtain a mixed solution, and then the mixed solution was transferred to a polytetrafluoroethylene-lined autoclave In the process, tighten the reactor and put it in an oven, keep it warm at 200°C for 10 hours, and cool the autoclave to room temperature naturally after solvent heat treatment to obtain a precipitate; after centrifuging the obtained precipitate, use ethanol and secondary water Spherical Fe was obtained after washing, centrifuging and drying 3 o 4 particles.
[0093] Preparation of Fe 3 o 4 @SiO 2 Composite particles Put 0.1g Fe in a 250mL beaker 3 o 4 , 80mL ethanol, 20mL water, mechanically stirred for 10min until Fe 3 o 4The particles are evenly dispersed in the solution, then use a pipette ...
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