Application of 3D coralline graphene/NiCo2O4 composite material

Abstract

The invention belongs to the chemistry field and provides a preparation method of 3D coralline graphene / NiCo2O4 composite material and application thereof in supercapacitor; the method comprises the following steps: 1) compositing the graphite oxide GO; 2) adding the Ni-Co salt and alkali source in the suspension liquid of the graphite oxide, microwave heating for preparing the GO / Ni-Co lamelleted bi-metal hydroxide composite material; 3) calcining the GO / Ni-Co lamelleted bi-metal hydroxide composite material at high temperature for preparing the 3D coralline graphene / NiCo2O4 composite material; 4) preparing the electrode plate and assembling the simulation supercapacitor for evaluating the performance. Compared with the prior art, the 3D coralline graphene / NiCo2O4 composite material has superior electrical conductivity, greater specific surface area, smaller mass transfer resistance and longer cycle service life. In addition, the 3D coralline graphene / NiCo2O4 composite material is used in the electrode material of the supercapacitor, the the 3D coralline graphene / NiCo2O4 composite material is superior to the existing rare metallic oxide on the cost and performance.

Description

technical field

[0001] The invention belongs to the field of chemical industry, in particular to a 3D coral-like graphene / NiCo 2 o 4 Application of composite materials. Background technique

[0002] Supercapacitor is a new type of energy storage device developed in the 1970s and 1980s. It is a power supply with special performance between traditional capacitors and batteries. It mainly relies on electric double layer and redox quasi-capacitance to store electric energy. , which is different from traditional chemical power sources. The outstanding advantages of supercapacitors are high power density, short charging time, long cycle life and wide operating temperature range. They have broad application prospects in national defense, railways, electric vehicle electronics, communications, aerospace and other fields. According to the energy storage mechanism, supercapacitors can be divided into electric double-layer capacitors and Faraday quasi-capacitors. The former uses th...

Examples

Embodiment 1

[0031] Disperse 10 mg of GO in a mixed solvent of absolute ethanol-water (V:V=10:0), ultrasonically disperse to form a suspension, add 0.582 g of nickel nitrate hexahydrate and 1.164 g of cobalt nickel nitrate hexahydrate, Stir to dissolve completely. Transfer the above suspension to a microwave-assisted heating device, adjust the microwave power to 300W, heat to reflux, add 10 mL of ammonia water to react for 10 min, cool, centrifuge, collect the precipitate, wash twice with absolute ethanol, and dry in vacuum at 50 °C to prepare GO / nickel-cobalt layered double hydroxide composites were obtained. The obtained GO / nickel-cobalt layered double hydroxide was calcined in a tube furnace at 800 °C for 2 h, and the precipitate was collected. Get 3D coral-like graphene / NiCo 2 o 4 composite material. 30 mg 3D coral-like graphene / NiCo 2 o 4 The composite material was ground and mixed with 5.6 mg acetylene black, a little polytetrafluoroethylene binder (15%) was added, a small amou...

Embodiment 2

[0033] Disperse 20 mg of GO in anhydrous ethanol-water (V:V=9:1) mixed solvent, ultrasonically disperse to form a suspension, add 0.582 g nickel nitrate hexahydrate, 1.164 g cobalt nickel nitrate hexahydrate salt, Stir to dissolve completely. Transfer the above suspension to a microwave-assisted heating device, adjust the microwave power to 400W, heat to reflux, add 10 mL of ammonia water to react for 15 min, cool, centrifuge, collect the precipitate, wash with absolute ethanol three times, and dry under vacuum at 60 °C. GO / nickel-cobalt layered double hydroxide composites were prepared. The obtained GO / nickel-cobalt layered double hydroxide was calcined in a tube furnace at 700 °C for 3 h, and the precipitate was collected. Get 3D coral-like graphene / NiCo 2 o 4 composite material. 30 mg 3D coral-like graphene / NiCo 2 o 4 The composite material was ground and mixed with 5.6 mg acetylene black, a little polytetrafluoroethylene binder (15%) was added, a small amount of abso...

Embodiment 3

[0035] Disperse 30 mg of GO in anhydrous ethanol-water (V: V=9.9: 0.1) mixed solvent, ultrasonically disperse to form a suspension, add 0.582 g nickel nitrate hexahydrate, 1.164 g cobalt nickel nitrate hexahydrate salt, Stir to dissolve completely. Transfer the above suspension to a microwave-assisted heating device, adjust the microwave power to 400W, heat to reflux, add 10 mL of ammonia water to react for 20 min, cool, centrifuge, collect the precipitate, wash with absolute ethanol three times, and dry under vacuum at 60 °C. GO / nickel-cobalt layered double hydroxide composites were prepared. The obtained GO / nickel-cobalt layered double hydroxide was calcined in a tube furnace at 800 °C for 2 h, and the precipitate was collected. Get 3D coral-like graphene / NiCo 2 o 4 composite material. 30 mg 3D coral-like graphene / NiCo 2 o 4 The composite material was ground and mixed with 5.6 mg acetylene black, a little polytetrafluoroethylene binder (15%) was added, a small amount o...

technical field

[0001] The invention belongs to the field of chemical industry, in particular to a 3D coral-like graphene / NiCo 2 o 4 Application of composite materials. Background technique

[0002] Supercapacitor is a new type of energy storage device developed in the 1970s and 1980s. It is a power supply with special performance between traditional capacitors and batteries. It mainly relies on electric double layer and redox quasi-capacitance to store electric energy. , which is different from traditional chemical power sources. The outstanding advantages of supercapacitors are high power density, short charging time, long cycle life and wide operating temperature range. They have broad application prospects in national defense, railways, electric vehicle electronics, communications, aerospace and other fields. According to the energy storage mechanism, supercapacitors can be divided into electric double-layer capacitors and Faraday quasi-capacitors. The former uses th...

Examples

Embodiment 1

[0031] Disperse 10 mg of GO in a mixed solvent of absolute ethanol-water (V:V=10:0), ultrasonically disperse to form a suspension, add 0.582 g of nickel nitrate hexahydrate and 1.164 g of cobalt nickel nitrate hexahydrate, Stir to dissolve completely. Transfer the above suspension to a microwave-assisted heating device, adjust the microwave power to 300W, heat to reflux, add 10 mL of ammonia water to react for 10 min, cool, centrifuge, collect the precipitate, wash twice with absolute ethanol, and dry in vacuum at 50 °C to prepare GO / nickel-cobalt layered double hydroxide composites were obtained. The obtained GO / nickel-cobalt layered double hydroxide was calcined in a tube furnace at 800 °C for 2 h, and the precipitate was collected. Get 3D coral-like graphene / NiCo 2 o 4 composite material. 30 mg 3D coral-like graphene / NiCo 2 o 4 The composite material was ground and mixed with 5.6 mg acetylene black, a little polytetrafluoroethylene binder (15%) was added, a small amou...

Embodiment 2

[0033] Disperse 20 mg of GO in anhydrous ethanol-water (V:V=9:1) mixed solvent, ultrasonically disperse to form a suspension, add 0.582 g nickel nitrate hexahydrate, 1.164 g cobalt nickel nitrate hexahydrate salt, Stir to dissolve completely. Transfer the above suspension to a microwave-assisted heating device, adjust the microwave power to 400W, heat to reflux, add 10 mL of ammonia water to react for 15 min, cool, centrifuge, collect the precipitate, wash with absolute ethanol three times, and dry under vacuum at 60 °C. GO / nickel-cobalt layered double hydroxide composites were prepared. The obtained GO / nickel-cobalt layered double hydroxide was calcined in a tube furnace at 700 °C for 3 h, and the precipitate was collected. Get 3D coral-like graphene / NiCo 2 o 4 composite material. 30 mg 3D coral-like graphene / NiCo 2 o 4 The composite material was ground and mixed with 5.6 mg acetylene black, a little polytetrafluoroethylene binder (15%) was added, a small amount of abso...

Embodiment 3

[0035] Disperse 30 mg of GO in anhydrous ethanol-water (V: V=9.9: 0.1) mixed solvent, ultrasonically disperse to form a suspension, add 0.582 g nickel nitrate hexahydrate, 1.164 g cobalt nickel nitrate hexahydrate salt, Stir to dissolve completely. Transfer the above suspension to a microwave-assisted heating device, adjust the microwave power to 400W, heat to reflux, add 10 mL of ammonia water to react for 20 min, cool, centrifuge, collect the precipitate, wash with absolute ethanol three times, and dry under vacuum at 60 °C. GO / nickel-cobalt layered double hydroxide composites were prepared. The obtained GO / nickel-cobalt layered double hydroxide was calcined in a tube furnace at 800 °C for 2 h, and the precipitate was collected. Get 3D coral-like graphene / NiCo 2 o 4 composite material. 30 mg 3D coral-like graphene / NiCo 2 o 4 The composite material was ground and mixed with 5.6 mg acetylene black, a little polytetrafluoroethylene binder (15%) was added, a small amount o...