Manganese cobalt sulfide/reduced graphene oxide composite material with excellent electrochemical performance and preparation method thereof
A composite material, graphene technology, applied in nanotechnology for materials and surface science, hybrid capacitor electrodes, nanotechnology, etc., can solve problems such as poor cycle performance
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Embodiment 1
[0028] Ultrasonically decompose 10mg of graphene oxide in 30mL of distilled water. After forming a uniform brown solution, add 30mg of ascorbic acid and stir evenly to obtain a dispersion. Clean the nickel foam with acetone, hydrochloric acid, and absolute ethanol in sequence. and deposited at 90°C for 6 hours, rinsed the surface of nickel foam with deionized water, and dried at 60°C for 12h.
[0029] 1 mmolMn(NO 3 ) 2 , 2 mmol Co(NO 3 ) 2 ·6H 2 O, 4 mmol NH 4 F and 12 mmol urea were mixed and dissolved in 70 mL of solvent, which was a mixed solution of deionized water and absolute ethanol at a ratio of 1:1 by volume. After stirring evenly, transfer it to the reaction kettle, put the foamed nickel substrate with reduced graphene oxide into it, and keep it at 100°C for 5 hours. After taking it out, rinse the surface of the sample with deionized water, and place it at 60°C After drying for 12 hours, it was annealed at 350 °C to obtain a precursor.
[0030] The composite o...
Embodiment 2
[0032] 1mmoL Na 2 S·9H2 O was dissolved in 60 mL deionized water, stirred and dissolved, then transferred to the reaction kettle, and the precursor prepared in Example 1 was put into it, kept at 120 °C for 1 hour, and the sample was rinsed with deionized water Surface, dry at 60°C for 12h.
[0033] The prepared composite was named MCS / rGO / NF-1h, and its electrochemical performance was tested in a three-electrode system (electrolyte 2 mol / L KOH) as a positive electrode material for a supercapacitor, and its specific capacitance was 1703 F g -1 .
Embodiment 3
[0035] 1mmoL Na 2 S·9H 2 O was dissolved in 60 mL deionized water, stirred and dissolved, then transferred to the reaction kettle, and the precursor prepared in Example 1 was put into it, kept at 120 °C for 3 hours, and the sample was rinsed with deionized water Surface, dry at 60°C for 12h.
[0036] The prepared composite was named MCS / rGO / NF-3h, and its electrochemical performance was tested in a three-electrode system (electrolyte 2 mol / L KOH) as a positive electrode material for a supercapacitor, and its specific capacitance was 2712 F g -1 .
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