A zinc oxide-coated nickel oxide ball for supercapacitor and preparation method thereof
A technology of supercapacitors and nickel oxide balls, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems affecting the electrical performance and cycle life of supercapacitors, and achieve the effects of facilitating electron transmission, preventing pulverization, and small internal resistance.
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[0024] An embodiment of the present invention provides a method for preparing zinc oxide-coated nickel oxide balls for supercapacitors, comprising the following steps:
[0025] S1: Disperse nickel oxide balls in ethanol solvent to obtain a suspension of nickel oxide balls.
[0026] In this step, the nickel oxide balls can be better dispersed by using ethanol solvent as the solvent. It should be noted that in order to ensure uniform dispersion, ultrasonic dispersion can be used, and those skilled in the art can specifically select the appropriate ultrasonic power and time according to the dispersion situation, so as to ensure uniform dispersion.
[0027] S2: Add tetraethyl orthosilicate and ammonia solution to the suspension of nickel oxide spheres in sequence, perform hydrolysis reaction for 1 h under stirring, collect the reaction product by centrifugation, and dry to obtain silica-coated nickel oxide spheres.
[0028] In this step, the added tetraethyl orthosilicate provide...
Embodiment 1
[0038] (1) Disperse 10 g of nickel oxide balls in 28.5 mL of ethanol solvent and ultrasonically disperse to obtain a suspension of nickel oxide balls, wherein the concentration of nickel oxide balls is 0.35 g / mL;
[0039] (2) Add 17.5mL tetraethyl orthosilicate to the above suspension of nickel oxide balls, stir vigorously and mix evenly, then slowly add 10.5mL ammonia solution with a concentration of 3mol / L, hydrolyze for 1h under stirring, centrifuge The reaction product is collected and dried to obtain silica-coated nickel oxide balls;
[0040] (3) Add 9 mL of isopropanol, 5 g of zinc acetate and 3.5 g of sodium hydroxide to the silica-coated nickel oxide spheres obtained above, mix well, place them in a reaction kettle, conduct a hydrothermal reaction at 120°C for 2 h, and centrifuge The reaction product was collected, dried, placed in a tube furnace, raised to 450°C at a heating rate of 2°C / min, roasted for 2 hours, and cooled naturally to room temperature, that is, zinc ...
Embodiment 2
[0042] (1) Disperse 10 g of nickel oxide balls in 50 mL of ethanol solvent and ultrasonically disperse to obtain a suspension of nickel oxide balls, wherein the concentration of nickel oxide balls is 0.2 g / mL;
[0043] (2) Add 5 mL of tetraethyl orthosilicate to the suspension of nickel oxide balls above, stir vigorously to mix evenly, then slowly add 3 mL of ammonia solution with a concentration of 1 mol / L, hydrolyze for 1 h under stirring, and collect the reaction by centrifugation Product, drying, obtains silica-coated nickel oxide ball;
[0044] (3) Add 8 mL of isopropanol, 4 g of zinc acetate, and 2 g of sodium hydroxide to the silica-coated nickel oxide spheres obtained above, mix well, place in a reaction kettle, conduct a hydrothermal reaction at 120°C for 2 h, and collect by centrifugation The reaction product was dried, placed in a tube furnace, raised to 450°C at a heating rate of 2°C / min, calcined for 2 hours, and naturally cooled to room temperature, that is, zinc...
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