Method for preparing 3D iron--oxide/graphene composite electrode material of super capacitor
A graphene composite, supercapacitor technology, applied in the field of electrochemistry, can solve problems such as poor conductivity, achieve the effects of improved conductivity, high specific capacitance and rate characteristics, and improved cycle stability
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Embodiment 1
[0026] Dissolve 600mg of polyvinylpyrrolidone in 800mL of methanol, add 590mg of ferric sulfate, ultrasonically disperse evenly, then add 2.63g of 4-nitroimidazole under stirring, stir in a water bath at 25°C for 1 hour, and let stand at room temperature for 24 hours to precipitate Iron-imidazole framework compound, washed with methanol and dried by centrifugation. The iron-imidazole framework compound in the Ar 2 / H 2 Heating at 350°C in the air for half an hour, and then calcining at 200°C in the air for half an hour to obtain iron oxide microspheres. Ultrasonic disperse iron oxide microspheres and graphite oxide (1:5) in 200mL of secondary water, add 3g of ascorbic acid, ultrasonically disperse for 2 hours, put it in a constant temperature water bath at 40°C, heat for 17 hours, put it in -4 overnight in the refrigerator at ℃, then freeze-dry to obtain a single iron oxide / graphite oxide airgel, puncture holes on the airgel, and introduce the above-mentioned iron oxide and ...
Embodiment 2
[0028] Dissolve 600mg of polyvinylpyrrolidone in 800mL of methanol, add 590mg of ferric chloride, ultrasonically disperse evenly, then add 2.63g of 2-nitroimidazole under stirring, stir in a water bath at 40°C for 2 hours, and let stand at room temperature for 24 hours , the iron-imidazole framework compound was precipitated, washed and dried by centrifugation with methanol. Iron-imidazole framework compound in Ar 2 / H 2 Heating at 350°C for 1 hour in the atmosphere, and then calcining at 500°C in the air for 5 hours to obtain iron oxide microspheres. Ultrasonic disperse iron oxide microspheres and graphite oxide (1:6) in 200mL of secondary water, add 3g of sodium borohydride, ultrasonically disperse for 2 hours, heat, put in a constant temperature water bath at 40°C, and heat for 17 hours. Put it in a -4°C refrigerator overnight, and then freeze-dry to obtain a single iron oxide / graphite oxide airgel. Puncture a hole on the airgel, and introduce the above-mentioned iron oxi...
Embodiment 3
[0030] Dissolve 600mg of polyvinylpyrrolidone in 800mL of methanol, add 590mg of ferric chloride, ultrasonically disperse evenly, then add 2.63g of 2-methylimidazole under stirring, stir in a water bath at 40°C for 1 hour, and let stand at room temperature for 24 hours , the iron-imidazole framework compound was precipitated, washed and dried by centrifugation with methanol. Iron-imidazole framework compound in Ar 2 / H 2Heat at 500°C in the air for half an hour, and then calcinate at 350°C in the air for 2 hours to obtain iron oxide microspheres. Ultrasonic disperse iron oxide microspheres and graphite oxide (1:5) in 200mL of secondary water, add 3g of ascorbic acid, ultrasonically disperse for 2 hours, put it in a constant temperature water bath at 40°C, heat for 17 hours, put it in -4 overnight in the refrigerator at ℃, then freeze-dry to obtain a single iron oxide / graphite oxide airgel, puncture holes on the airgel, and introduce the above-mentioned iron oxide and graphit...
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