A kind of egg yolk structure transition metal oxide/graphene composite material and its preparation method and application
A transition metal, egg yolk structure technology, applied in the fields of inorganic non-metallic materials and electrochemistry, can solve problems such as deformation and electrode material shedding, and achieve the effects of simple process, improved performance, and improved energy density and power density.
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Embodiment 1
[0050] A preparation method of egg yolk structure transition metal oxide / graphene composite material, specifically comprising the following steps:
[0051] (1) Synthesis of graphene oxide
[0052] Prepare graphene oxide by the improved Hummers method, concrete flow process is as follows: under ice-bath condition, add 300mL vitriol oil (mass percent concentration is 98%) in the 1000mL flask that fills 5g sodium nitrate and 2g graphite mixture, stir reaction 1h ( The stirring speed is 1000r / min), then gradually add 30g potassium permanganate in 10 times, control the reaction temperature within 10°C, then react at room temperature for 24h, then transfer the flask to an oil bath for heating, keep the temperature at 98°C, add 300mL to Ionized water, react for 24 hours, the color of the solution turns from black to brownish yellow; add 100mL of 35% hydrogen peroxide, react for 1 hour, reduce residual oxides, wash with 5% hydrochloric acid solution and deionized water to weak Acidic...
Embodiment 2
[0061] A preparation method of egg yolk structure transition metal oxide / graphene composite material, specifically comprising the following steps:
[0062] (1) Synthesis of graphene oxide
[0063] Prepare graphene oxide by the improved Hummers method, concrete flow process is as follows: under ice-bath condition, add 100mL mass fraction in the 1000mL flask that fills 1g sodium nitrate and 3g graphite mixture and be the vitriol oil of 98%, stirring reaction (stirring speed is 500r / min, stirring time is 0.5h), then gradually add 15g of potassium permanganate in 5 times, control the reaction temperature within 6°C, then the reaction time at room temperature is 10h, transfer the flask to an oil bath for heating, keep the temperature at 90°C, add 100mL of deionized water, react for 2 hours, the color of the solution changes from black to brownish yellow; add 50mL of 35% hydrogen peroxide, react for 1 hour, reduce residual oxides, wash with 3% hydrochloric acid solution and deionize...
Embodiment 3
[0070] A preparation method of egg yolk structure transition metal oxide / graphene composite material, specifically comprising the following steps:
[0071] (1) Synthesis of graphene oxide
[0072] Graphene oxide is prepared by the improved Hummers method, and the specific process is as follows: under ice bath conditions, add 500mL mass fraction of 98% concentrated sulfuric acid to a 1000mL flask filled with 6g sodium nitrate and 6g graphite mixture, stir for 0.7h (stirring speed 800r / min), then gradually add 35g of potassium permanganate in 15 times, control the reaction temperature within 20°C, then react at room temperature for 17h, transfer the flask to an oil bath for heating, keep the temperature at 100°C, add 400mL of deionized water, After reacting for 12 hours, the color of the solution changed from black to brownish yellow; add 150 mL of 35% hydrogen peroxide and react for 1 hour to reduce the residual oxides, wash with 10% hydrochloric acid solution and deionized wat...
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