Cobalt-based complex oxide/graphene composite material as well as preparation method and application thereof
A composite material and oxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of capacity decay and large volume change, and achieve the effects of improved electrochemical performance, simple process and uniform distribution
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Embodiment 1
[0032] Fe(NO 3 ) 2 ·6H 2 O and CoCl 2 ·6H 2 O was dissolved in ethylene glycol and prepared as 80 mL of Fe 2+ and Co 2+ A solution with a total concentration of 0.03 mol / L was added, and 38 mg of GO was added and mixed uniformly by ultrasonic dispersion, and the pH value was adjusted to 10 with 4 mol / L KOH aqueous solution, and then refluxed at 70°C for 16 hours to obtain a mixed solution; The mixed solution was placed in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, percent by volume), then the reactor was sealed, reacted at 160 ° C for 8 hours, and cooled naturally to room temperature; the solid reaction product was collected, and the product was Alternately washed with deionized water and absolute ethanol, dried to obtain 0.205g FeCo 2 o 4 / Graphene composite material, wherein, the weight percent composition of graphene is 7.5%.
[0033] It can be seen from the X-ray diffraction spectrum, transmission electron micrograph and scanning electro...
Embodiment 2
[0036] MgSO with a molar ratio of 1:2 4 ·7H 2 O and CoSO 4 ·7H 2 O dissolved in deionized water to make 80 mL of Mg 2+ and Co 2+ A solution with a total concentration of 0.09mol / L was added to 60 mg of GO, dispersed and mixed uniformly by ultrasound, the pH value was adjusted to 9 with 4mol / L NaOH aqueous solution, and then refluxed at 80°C for 24 hours to obtain a mixed solution; The mixed solution was placed in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and then the reactor was sealed, reacted at 180°C for 5 hours, and cooled naturally to room temperature; the solid reaction product was collected, and the product was Washed alternately and repeatedly with deionized water and absolute ethanol, and dried to obtain 0.51g MgCo 2 o 4 / Graphene composite material, wherein, the weight percent composition of graphene is 4.7%.
[0037] It can be seen from the X-ray diffraction pattern, transmission electron micrograph and scannin...
Embodiment 3
[0040] Cu(CH with a molar ratio of 1:2 3 COO) 2 ·H 2 O and CoCl 2 ·6H 2 O was dissolved in toluene and made into 80 mL of Cu 2+ and Co 2+ A solution with a total concentration of 0.15 mol / L was added, and 46 mg of GO was added, dispersed and mixed uniformly by ultrasound, and the pH value was adjusted to 8.5 with 25wt% ethanolamine aqueous solution, and then refluxed at 90°C for 10 hours to obtain a mixed solution; The solution was placed in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, percent by volume), then the reactor was sealed, reacted at 170 ° C for 10 hours, and then cooled naturally to room temperature; the solid reaction product was collected, and the product was subjected to Wash with deionized water and absolute ethanol alternately and repeatedly, and dry to obtain 1.0 g CuCo 2 o 4 / graphene composite material, wherein the weight percentage of graphene is 1.9%.
[0041] It can be seen from the X-ray diffraction spectrum, transmissi...
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