Morphology-controllable cobalt-aluminum dihydroxide/reduced graphene oxide composite material and preparation method thereof
A double hydroxide and composite material technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor collectors, etc., can solve problems such as unfavorable practical applications and easy aggregation of double hydroxides
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Embodiment 1
[0031] Add 10 mg of graphene oxide into 30 mL of deionized water, ultrasonically disperse for 2 hours to form a uniform brown dispersion, then add 30 mg of ascorbic acid and stir evenly to obtain a mixed solution; nickel foam (1*2cm 2 ) in sequence with acetone, 3mol / L hydrochloric acid, deionized water, and absolute ethanol for 10 minutes with ultrasonic assistance, and then immersed in the mixed solution; put it in a water bath at 90°C, chemically deposit for 6 hours, take it out and rinse off the residue , dried in an oven at 70°C for 12 h, and stored for future use.
[0032] 2mmol Co(NO 3 ) 2 ·6H 2 O and 1mmol Al(NO 3 ) 2 9H 2 O, 4 mmol NH 4 F and 12mmol CO(NH 2 ) 2 Dissolve in 60 mL of deionized water, stir at room temperature for 30 min until a uniform pink precursor solution is formed; pour the precursor solution into a hydrothermal reactor with a capacity of 100 mL, and immerse the nickel foam deposited on the reduced graphene oxide in solution; place the reac...
Embodiment 2
[0035] NH 4 The amount of F used is 6 mmol, and the rest of the steps are the same as in Example 1.
[0036] The prepared composite was named CoAl-LDH@rGO-6 / NF. As the positive electrode material of supercapacitor, the electrochemical performance was tested in a three-electrode system (the electrolyte was 2mol / L KOH), and its specific capacitance was 1671.4 f -1 .
Embodiment 3
[0038] NH 4 The amount of F used is 8 mmol, and the rest of the steps are the same as in Example 1.
[0039]The prepared composite was named CoAl-LDH@rGO-8 / NF. As the positive electrode material of the supercapacitor, the electrochemical performance was tested in the three-electrode system (the electrolyte was 2mol / L KOH), and its specific capacitance was 1464.4 f -1 .
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