Preparation method and application of a porous vanadium nitride nanobelt airgel
A vanadium nitride nano and gas-carrying technology, which is applied in nanotechnology, nanotechnology, nitrogen-metal/silicon/boron binary compounds, etc., can solve the problem that the electrochemical performance cannot meet the requirements of supercapacitors, and achieve rapid three-dimensional electrolyte diffusion channel, simple preparation method, and the effect of improving electrochemical performance
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Embodiment 1
[0028] (1) Dissolve 4 g of ammonium metavanadate in 100 mL of water / ethanol (volume ratio 9:1) mixed solvent under stirring, and adjust the pH value to 2 with hydrochloric acid;
[0029] (2) then the solution prepared by step (1) is added in a sealed hydrothermal kettle, and reacted for 24 hours at 180° C. After the product was rinsed with deionized water, it was freeze-dried to obtain vanadium pentoxide (V 2 o 5 ) nanoribbon airgel (such as figure 1 ); prepared V 2 o 5 It has a smooth nanoribbon structure, the width of the nanoribbon is about 50nm-150nm, and the length is about ten microns;
[0030] (3) Put the vanadium pentoxide nanobelt airgel into the tube furnace, feed ammonia / argon gas mixture (the volume ratio of ammonia gas to argon gas is 1:1), and the total flow rate of the gas mixture is 80 sccm; The temperature was raised to 550° C., the heating rate was 10° C. per minute, and heat treatment was performed for 3 hours; after cooling to room temperature, porous v...
Embodiment 2
[0032] (1) Dissolve 2 g of ammonium metavanadate in 100 mL of water / ethanol (volume ratio 10:1) mixed solvent under stirring, and adjust the pH value to 3 with nitric acid;
[0033] (2) then the solution prepared by step (1) is added in a sealed hydrothermal kettle, reacted for 26 hours at 140°C, after the product was rinsed with deionized water, and freeze-dried to obtain green vanadium oxide (V 2 o 5 and VO 2 Hybrid) nanoribbon aerogel, its SEM image and figure 1 Similar to smooth nanoribbon structure; Figure 4 is the corresponding XRD pattern, and the diffraction peaks in the figure indicate that the prepared vanadium oxide is V 2 o 5 and VO 2 mixture;
[0034] (3) Put the green vanadium oxide nanobelt aerogel into the tube furnace, feed ammonia / nitrogen gas mixture (the volume ratio of ammonia gas to nitrogen gas is 2:1), and the total flow rate of the gas mixture is 60 sccm; the temperature is raised to 650 ℃, heat treatment for 4 hours, the heating rate is 5 ℃ pe...
Embodiment 3
[0036] (1) Dissolve 6 g of ammonium metavanadate in 100 mL of water / ethanol (volume ratio 6 / 1) mixed solvent under stirring, and adjust the pH value to 2.5 with hydrochloric acid;
[0037] (2) Then add the solution prepared in step (1) into a sealed hydrothermal kettle, react at 220°C for 18 hours at a certain temperature, rinse the product with deionized water, and freeze-dry to obtain V 2 o 5 Nanoribbon airgel, its SEM image is the same as figure 1 Similar to smooth nanoribbon structure;
[0038] (3) Put V 2 o 5 The nanoribbon airgel is placed in a tube furnace, and the ammonia / argon gas mixture (the volume ratio of ammonia gas to argon gas is 1:2) is introduced, and the total flow rate of the gas mixture is 100 sccm. Raise the temperature to 500°C, heat treatment for 1.5 hours, and the heating rate is 15°C per minute; after cooling to room temperature, a porous vanadium nitride nanoribbon airgel is obtained, and its SEM image is consistent with that of figure 2 Simila...
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