Ultrafine sulfide/graphene two-dimensional composite material and preparation method and application thereof
A composite material and graphene technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of lack of active species size, poor electrochemical performance, and unsatisfactory interaction, etc., to achieve excellent electrochemical performance Performance, improved energy storage effect, and good rate characteristics
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[0024] The preparation method of ultrafine sulfide / graphene composite material of the present invention, comprises the following steps:
[0025] Step 1. Add graphene oxide into deionized water, ultrasonically mix and stir evenly, add to the above solution, ultrasonically mix to form a uniform solution, and the bridging agent is one of polyaniline, polyethyleneimine, and polydopamine. The ratio of graphene oxide, deionized water and bridging agent is (10-100) mg: (50-250) mL: (10-200) mg.
[0026] Step 2. Transfer the mixed solution in step 1 to a constant temperature oil bath or water bath at 60-120° C., keep it for 3-48 hours, and centrifugally wash the obtained product until it becomes neutral to prepare a functionalized graphene material.
[0027] Step 3. Disperse the functionalized graphene material in step 2 into 20-100mL water, and add soluble metal salt and sulfur source to the above-mentioned functionalized graphene material according to the mass ratio (0.1-1.0): (0.1-...
Embodiment 1
[0032] 20 mg of graphene oxide was added to 100 mL of deionized water, ultrasonically mixed and stirred evenly, 30 mg of polyethyleneimine was added to the above solution, and ultrasonically mixed to form a uniform solution. Then the mixed solution was transferred to a constant temperature water bath at 80° C. for 12 hours, and the obtained product was centrifuged and washed until neutral. Disperse the obtained polyethyleneimine / graphene composite material into 50mL solution, add 0.3g cobalt chloride and 0.5g trisodium thiocyanate trisodium salt at room temperature, mix and stir evenly, and react at 120°C for 18 hours, The obtained product is centrifugally washed to neutrality, dried, and ground to prepare an ultrafine cobalt sulfide / graphene two-dimensional composite material.
[0033] The ultrafine cobalt sulfide / graphene two-dimensional composite material was characterized by scanning electron microscopy, and the characterization results are as follows figure 1 As shown, i...
Embodiment 2
[0035] 20 mg of graphene oxide was added to 100 mL of deionized water, ultrasonically mixed and stirred evenly, 30 mg of polyethyleneimine was added to the above solution, and ultrasonically mixed to form a uniform solution. Then the mixed solution was transferred to a constant temperature water bath at 80° C. for 12 hours, and the obtained product was centrifuged and washed until neutral. Disperse the obtained polyethyleneimine / graphene composite material into 50mL solution, add 0.3g cobalt chloride and 0.5g trisodium thiocyanate trisodium salt at room temperature, mix and stir evenly, and react at 180°C for 12 hours, The obtained product is centrifugally washed to neutrality, dried, and ground to prepare an ultrafine cobalt sulfide / graphene two-dimensional composite material.
[0036] Ultrafine cobalt sulfide / graphene two-dimensional composites were tested as electrode materials for supercapacitors, figure 2 is the cyclic voltammetry curve of the electrode material, and th...
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