Method for preparing NH4V3O8 nanoribbon
A nanobelt and 2SO4 technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of poor conductivity, large internal resistance, and affecting the performance of supercapacitors, and achieve the effect of overcoming high cost
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[0024] According to the preparation of the present invention NH 4 V 3 o 8 The nanoribbon method comprises the following steps:
[0025] a) Set V 2 o 5 Adding hydrogen peroxide solution, stirring in a warm water bath until forming a solution containing the sol, aging the solution containing the sol in the dark to form a gel, and centrifuging to obtain the sol and the gel;
[0026] b) Then, take the sol separated in the previous step and add (NH 4 ) 2 SO 4 , stirred in a warm water bath until (NH 4 ) 2 SO 4 Dissolve and mix thoroughly, adjust the pH value of the obtained solution to 1.5-4.5, then transfer the obtained solution to a hydrothermal reaction kettle, undergo a high-temperature hydrothermal reaction, and then filter under reduced pressure, wash and dry the obtained precipitate to obtain NH 4 V 3 o 8 nanobelt.
[0027] Wherein, step a adopts sol-gel method and utilizes V 2 o 5 As a raw material, the vanadium precursor sol containing vanadium-oxygen comple...
example 1
[0061] Specific steps are as follows:
[0062] (1) Weighing 0.3640gV 2 o 5 Added to 16.32ml mass concentration of 10% H 2 o 2 The solution was heated in a water bath at 25° C. and stirred with a magnetic stirrer for 1 h, then aged in air for 12 h under dark conditions, and centrifuged to obtain a sol and a gel.
[0063] (2) Take 2ml of the obtained sol and add 38ml of deionized water to make up to 40ml, then add 0.1320g (1mmol) of (NH 4 ) 2 SO 4 and heated in a water bath at 25° C. and stirred with a magnetic stirrer for 10 minutes until fully mixed. At this time, the pH value of the obtained solution was measured to be 2.5, and there was no need to adjust the pH value. The obtained solution was transferred to a hydrothermal reaction kettle, allowed to react under hydrothermal conditions of 180° C. for 24 h, and then allowed to cool naturally to room temperature.
[0064] (3) Filter the obtained product, centrifuge and wash the obtained precipitate with deionized water ...
example 2
[0068] The specific steps wherein are basically the same as Example 1, except that when adjusting the pH value of the hydrothermal reaction solution, the pH values are respectively controlled to 4.5, 3.0 and 1.5, and then subsequent reactions are performed to obtain Figure 2a to Figure 2f The three groups of NH shown 4 V 3 o 8 Nanoribbon products.
[0069] Such as Figure 2a and Figure 2b As shown, when the pH value of the hydrothermal reaction solution is 4.5, the product is mainly composed of a single nanobelt and some nanowires that grow interlacedly. The width of the nanobelt is about 1-7 μm, the thickness is about 50 nm, and the length can reach A few microns; the diameter of the nanowire is uniform, about 30nm, and the length can reach several microns. Observing the surface and fracture of the nanoribbons under high magnification revealed that these ultra-wide nanoribbons are formed by laterally juxtaposing dozens of thin nanowires.
[0070] Such as Figure 2c...
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