Method for preparing three-dimensional nickel oxide/graphene composite material for supercapacitor
A technology of supercapacitors and composite materials, applied in the field of functional material preparation and electrochemistry, can solve the problems of cumbersome operation, long time, easy agglomeration of materials, etc., and achieve the effect of excellent performance
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Embodiment 1
[0031] Example 1 (1) 25 mg of nickel nitrate and 25 mg of urea were weighed, dissolved in 30 mL of deionized water, mixed evenly, and the mixed solution was transferred to a 100 mL sealable reaction kettle.
[0032] (2) Trim the nickel foam into a rectangular piece with a length of 5cm and a width of 3cm, first soak it in acetone, and ultrasonically clean it for 30 minutes, then soak it in ethanol, and ultrasonically clean it for 30 minutes to remove the organic matter on the surface, and then use deionized water Rinse, then soak in 10mL of 0.1mol / L dilute hydrochloric acid for 10min to remove surface oxides, then ultrasonically clean with deionized water for 20min, and finally dry the nickel foam in a drying oven at a constant temperature of 80°C for 2h for later use.
[0033] (3) Put the cleaned and dried nickel foam into the reaction kettle with the mixed liquid, seal it and place it in the homogeneous reactor, set the reaction temperature to 180°C, take it out after 3 hours...
Embodiment 2
[0042] (1) Weigh 25mg of nickel nitrate and 25mg of urea respectively, dissolve them in 50mL of deionized water, mix well and transfer the mixed solution into a 100mL sealable reaction kettle.
[0043] (2) Trim the nickel foam into a rectangular piece with a length of 5cm and a width of 3cm, first soak it in acetone, and ultrasonically clean it for 30 minutes, then soak it in ethanol, and ultrasonically clean it for 30 minutes to remove the organic matter on the surface, and then use deionized water Rinse, then soak in 10mL of 0.1mol / L dilute hydrochloric acid for 10min to remove surface oxides, then ultrasonically clean with deionized water for 20min, and finally dry nickel foam in a drying oven at a constant temperature of 60°C for 2h for later use.
[0044] (3) Put the cleaned and dried nickel foam into the reaction kettle with the mixed liquid, seal it and place it in the homogeneous reactor, set the reaction temperature to 190°C, take it out after 2 hours of reaction, and ...
Embodiment 3
[0049] (1) Weigh 25mg of nickel nitrate and 25mg of urea respectively, dissolve them in 30mL of deionized water, mix well and transfer the mixed solution into a 100mL sealable reaction kettle.
[0050] (2) Trim the nickel foam into a rectangular piece with a length of 5cm and a width of 3cm, first soak it in acetone, and ultrasonically clean it for 30 minutes, then soak it in ethanol, and ultrasonically clean it for 30 minutes to remove the organic matter on the surface, and then use deionized water Rinse, then soak in 10mL of 0.3mol / L dilute hydrochloric acid for 10min to remove surface oxides, then ultrasonically clean with deionized water for 20min, and finally dry nickel foam in a drying oven at a constant temperature of 60°C for 4h for later use.
[0051] (3) Put the cleaned and dried nickel foam into the reaction kettle with the mixed liquid, seal it and place it in the homogeneous reactor, set the reaction temperature to 180°C, take it out after 3 hours of reaction, and ...
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