Preparation method and application of carbon-nitrogen-coated Fe0. 4Co0. 6S2-coated NC hollow nano box
A coating, carbon and nitrogen technology, applied in the field of nanomaterial preparation, can solve the problems of poor conductivity and low specific surface area of PB/PBA
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[0033] The invention provides a carbon-nitrogen-coated Fe 0.4 co 0.6 S 2 The preparation method of @NC hollow nano box material comprises the following steps:
[0034] a. Stir cobalt chloride and trisodium citrate in deionized water to obtain a clear and uniform solution A, ultrasonically dissolve sodium ferricyanide in deionized water to obtain a homogeneous solution B, add B to A, stir and let it stand to obtain Precursor cobalt-based Prussian blue material;
[0035] b. Dissolving the precursor obtained in step a in deionized water, adding an aqueous solution of dopamine, and adding tromethamine to adjust the pH, stirring to coat the surface of the precursor with dopamine, and drying to obtain a powder sample;
[0036] c. Mix the dopamine-coated Prussian blue precursor obtained in step b with excess sulfur powder, and anneal under the protection of an inert gas to obtain carbon-nitrogen-coated Fe 0.4 co 0.6 S 2 @NC hollow nanobox.
[0037] The mass ratio of the precur...
Embodiment 1
[0059] a. Weigh 3.675g (12.5mmol) trisodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) and 594.8mg (2.5mmol) cobalt chloride (CoCl 2 ·6H 2 O) add 250ml deionized water, stir to dissolve under 500rpm rotating speed, obtain homogeneous solution A; Weigh 605.08mg (1.25mmol) sodium ferricyanide (Na 4 [Fe(CN) 6 ]·10H 2 O) Add 250ml of deionized water, stir at 500rpm until dissolved to obtain a homogeneous solution B; pour B into A, continue to stir for about 5min until the liquid becomes cloudy, and keep it in the dark for 24h.
[0060] b. After the above mixed material precipitated, the supernatant was discarded, the precipitated product was washed several times with deionized water and absolute ethanol, and dried in an oven at 80°C for 12 hours to obtain the precursor cobalt-based Prussian blue nanocubes.
[0061] c. Weigh 200mg of the above precursor powder, stir and dissolve in 200ml deionized water, and add about 90mg tromethamine (C 4 h 11 NO 3 ); another 200 mg of dopamine...
Embodiment 2
[0071] Prepare carbon-nitrogen-coated Fe according to the method in Example 1 0.4 co 0.6 S 2 @NC hollow nano box, the difference is that the masses of the precursor and dopamine in step c in this example are 200mg and 100mg respectively.
[0072] Figure 7 and Figure 8 Respectively the carbon-nitrogen-coated Fe obtained in Example 2 of the present invention 0.4 co 0.6 S 2 The X-ray diffraction pattern and transmission electron microscope image of the @NC hollow nanobox sample, by Figure 7 It can be seen that when the mass ratio of precursor and dopamine is 1:0.5, the prepared sample still contains CoS 2 and FeS 2 , but from Figure 8 It can be seen that the hollow cubic structure cannot be well maintained due to the small amount of carbon coating.
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