A kind of ni-c composite material and preparation method thereof for supercapacitor
A technology of supercapacitors and composite materials, which is applied in the manufacture of hybrid/electric double-layer capacitors, electrodes of hybrid capacitors, etc., to achieve the effects of less capital investment in equipment, easy control of reaction conditions, and low production costs
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Embodiment 1
[0031] The preparation of embodiment 1 Ni-C composite material
[0032] 1.1 Preparation of ZIF-8
[0033] (1) Before the experiment, prepare several 50mL beakers, one 100mL beaker, one medicine spoon, two magnetic stirrers, and one 50mL measuring cylinder, soak them in aqua regia and wash them before use. And 5-50μL pipette gun, 100-1000μL pipette gun;
[0034] (2) Weigh 0.1822g CTAB (cetyltrimethylammonium bromide) with an electronic balance, put it into a 50mL beaker, and then use a 50mL graduated cylinder to measure 50mL of deionized water to dissolve. Weigh 5.4186g of 2-methylimidazole with an electronic balance, measure 50mL of deionized water, and pour it into a 50mL beaker to dissolve. Weigh 0.357g of zinc nitrate hexahydrate with an electronic balance, measure 50mL of deionized water, and pour it into a 50mL beaker to dissolve. Use a measuring cylinder and a 100-1000μL pipette gun to measure 7.2mL CTAB and mix it with the above-mentioned 2-methylimidazole, stir on a...
Embodiment 2
[0044] Physicochemical property characterization of embodiment 2 Ni-C composite material
[0045] 2.1 Form
[0046] ZIF-8 nano cube in embodiment 1, the scanning electron microscope image of microporous carbon nano cube is as figure 1 , figure 2shown. It can be seen from the figure that the original shape of ZIF-8 is a regular cubic shape, and the particles are neatly arranged. It can be seen from the calculation of the scale that the side length of ZIF-8 is about 25nm. The morphology of microporous carbon nanocubes after ZIF-8 calcination is basically regular-shaped particles, and the particles are neatly arranged. It can be seen from the calculation of the scale that the side length of ZIF-8 after calcination is about 10nm. It can be seen that the microporous carbon nanocubes obtained by calcination change from white to black and shrink in volume.
[0047] 2.2 XRD spectrum of ZIF-8
[0048] like image 3 As shown, it can be seen that the characteristic diffraction pea...
Embodiment 3
[0051] Specific capacitance performance of embodiment 3 Ni-C composite material
[0052] 3.1 Volt-ampere cycle performance
[0053] Depend on Figure 5 It can be seen that at a sweep rate of 10 mV s -1 , 20 mV s -1 , 30 mV s -1 , 40 mV s -1 , 50mV·s -1 , 80 mV s -1 When the scanning voltage is 0V-0.6V, the cyclic voltammetry curves of Ni-C composites have oxidation peaks and reduction peaks at around 0.45V and 0.25V, respectively, which basically conforms to the oxidation of supercapacitors with metallic Ni introduced in the literature. Restore peak to peak position. And as the scan rate increases, the shape of the CV curves does not change significantly, which indicates the improvement of mass transport and electron conduction in Ni-C composites. The CV curves show that the capacitance of the Ni-C composite supercapacitor is mainly derived from the pseudocapacitance, that is, from the redox of metallic Ni. During the forward and reverse scanning of the capacitor, the...
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