Three-dimensional ordered macroporous carbon-coated NiMoO4/reduced graphene oxide nanocomposite and preparation method thereof
A nano-composite material and three-dimensional ordering technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve problems such as low energy storage density, inability to meet the maximum peak power, and energy storage problems restricting development. The effect of large specific surface area and excellent electrochemical performance
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Embodiment 1
[0029] 1) Pipette 30 mg of GO into deionized water, and sonicate for 30 min to disperse GO evenly. Then add 0.15g Anderson type (NH 3 ) 4 (NiMo 6 o 24 h 6 ), sonicated for 15min to dissolve.
[0030] 2) Transfer the above dispersion to a 100mL eggplant-shaped bottle, heat and stir at 105°C, and condense under reflux for 12h.
[0031] 3) After the reaction, the reaction solution was lowered to room temperature, and centrifuged and washed three times with deionized water, the supernatant was discarded, and the GO / (NH 3 ) 4 (NiMo 6 o 24 h 6 ) concentration was concentrated to 15mg / mL.
[0032] 4) According to the volume ratio of 1:1, add 50 mg / mL PVA solution to 3) in GO / (NH 3 ) 4 (NiMo 6 o 24 h6 ), then mixed evenly and transferred to a 1mL disposable needle tube, and frozen in a liquid nitrogen atmosphere for 8h.
[0033] 5) Transfer the sample obtained in 4) to a freeze dryer for freeze drying for 72 hours at a drying temperature of -72°C to form a complete bloc...
Embodiment 2
[0037] Note: Steps 1) to 5) are the same as in Example 1 and will not be repeated here.
[0038] 6) Calcining the sample in step 5) under a nitrogen atmosphere at 600°C to finally obtain the product C-NiMoO 4 / Reduced Graphene Oxide-2.
[0039] The three-dimensional ordered macroporous C-NiMoO prepared by this example 4 / Reduced graphene oxide-2 nanocomposite, its scanning electron microscope see figure 2 , showing a honeycomb structure, and compared with Example 1, the sheet is thicker, indicating that the degree of carbonization of PVA increases, which is conducive to the increase of conductivity, and when it is prepared as a supercapacitor electrode, it exhibits excellent electrochemical performance.
Embodiment 3
[0041] Note: Steps 1) to 5) are the same as in Example 2 and will not be repeated here.
[0042] 6) Calcining the sample in step 5) in a nitrogen atmosphere at 700°C to finally obtain the product C-NiMoO 4 / Reduced graphene oxide-3.
[0043] The three-dimensional ordered macroporous C-NiMoO prepared by this example 4 / Reduced graphene oxide-3 nanocomposite material, its XRD pattern is shown in image 3 , 2θ is 20~30°, there is a big broad peak, which is an obvious characteristic peak of carbon materials, and it is NiMoO at 14.3°, 21.7°, 25.3°, 29.7°, 32.6°, 43.9° 4 The characteristic diffraction peaks of the prepared C-NiMoO 4 / reduced graphene oxide-3 nanocomposite exhibits a nice crystal form.
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