Silicon dioxide@metal oxide/graphene aerogel dual-loaded dual-coated composite material and preparation method and application thereof
A graphene aerogel, silica technology, applied in the direction of hybrid capacitor electrodes, etc., can solve problems such as volume expansion loss, and achieve the effects of inhibiting volume expansion, simple operation, and environmental friendliness
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Embodiment 1
[0039] Preparation of graphite oxide: Add 1g of natural graphite flakes and 6g of potassium permanganate into 90mL of concentrated sulfuric acid and 10mL of phosphoric acid mixture, heat with magnetic stirring at 50°C for 12h, wait for the reaction to cool to room temperature, slowly add 200mL of ice water and stir for several minutes, Then add an appropriate amount of 30% hydrogen peroxide to reduce the remaining oxidant until the mixed solution is bright yellow and no bubbles are generated, then use 5% hydrochloric acid, ethanol, and deionized water to wash by centrifugation until neutral, and the resulting solution is dried in a vacuum oven at 60°C 12h, graphite oxide was obtained.
[0040] Take 0.32g graphite oxide in beaker A, add 130m water to dissolve it, and disperse it by ultrasonic for 4h to form graphene oxide aqueous solution. Take 0.08g of cobalt chloride hexahydrate in the B beaker, add 30mL of water to dissolve, then add 0.08g of tetraethyl orthosilicate, and ul...
Embodiment 2
[0047] The preparation method of graphite oxide is with embodiment 1. Take 0.32g of graphite oxide in beaker A, add 160m water to dissolve it, and disperse it by ultrasonic for 4h to form graphene oxide aqueous solution. Then pour the solution into a 200mL polytetrafluoroethylene reactor for hydrothermal reaction at 120°C for 12h. The product was centrifuged and washed with ethanol and deionized water, and the graphene airgel was obtained after freeze-drying.
[0048] The prepared graphene airgel was subjected to galvanostatic charge and discharge tests at a current density of 1A / g, and the results were as follows: image 3 As shown, its specific capacitance is about 200F / g.
Embodiment 3
[0050] The preparation method of graphite oxide is with embodiment 1. Take 0.32g graphite oxide in beaker A, add 130m water to dissolve it, and disperse it by ultrasonic for 4h to form graphene oxide aqueous solution. Take 0.08g of cobalt chloride hexahydrate in the B beaker, add 30mL of water to dissolve; add the mixed solution in the B beaker to the A beaker drop by drop, ultrasonically mix it evenly and put it into a 200mL polytetrafluoroethylene reactor with 120°C water Thermal reaction for 12h.
[0051] The product was centrifuged and washed with ethanol and deionized water, freeze-dried, and then placed in a tube furnace for calcination at a constant temperature of 350°C for 3 hours to obtain Co 3 o 4 / GA composites.
[0052] Prepared Co 3 o 4 / GA composites were subjected to constant current charge and discharge tests at a current density of 1A / g, and the results were as follows image 3 As shown, its specific capacitance is about 360F / g.
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