Method for manufacturing porous flaky NiCo2O4 and grapheme composite capacitive material

Abstract

The invention relates to a method for manufacturing a porous flaky NiCo2O4 and grapheme composite capacitive material, and belongs to the field of nano composite material manufacturing. According to the method, a graphite oxide, cobalt nitrate and nickel nitrate are dissolved in deionized water in an ultrasonic mode and stirred, a certain amount of hexamethylene tetramine is added, a reflux reaction is carried out for 3-4 hours at the temperature of 90 DEG C, sediments are collected, the collected sediments are calcined in an air atmosphere for 2 hours at the temperature of 330 DEG C, and the porous flaky NiCo2O4 and grapheme nano composite material is obtained. In the manufactured porous flaky NiCo2O4 and grapheme composite capacitive material, porous flaky NiCo2O4 is completely attached to the surface of a grapheme piece. By means of the composite structure, conductivity of the material is improved, and the contact area of the material and an electrolyte solution is greatly improved, so that the composite material has high specific capacitance and good electrochemical stability and can be possibly used as a super-capacitor electrode material.

Description

technical field

[0001] The invention belongs to the field of preparation of nanocomposite materials, in particular to a porous sheet NiCo 2 o 4 / The preparation method of graphene composite capacitance material. Background technique

[0002] At present, with the rapid development of the economy, the social problems caused by energy shortages are becoming more and more prominent, making people's demand for continuous and efficient energy storage devices more urgent; supercapacitors have short charging time, long service life, The characteristics of good temperature characteristics, energy saving and environmental protection have attracted widespread attention and have broad application prospects; the electrode materials for supercapacitors are usually metal oxides and conductive polymers, but these electrode materials are due to their own Small capacitance and poor conductivity restrict its popularization and application in supercapacitors; in recent years, studies have fou...

Examples

Embodiment 1

[0027] Example 1: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.250 mmol Co(NO 3 ) 2 . 6H 2 O and 0.125 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 3 h; the obtained black product was centrifuged, and washed with water and ethanol for 3 times, at 45 o C and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

Embodiment 2

[0028] Example 2: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.250 mmol Co(NO 3 ) 2 . 6H 2 O and 0.125 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 4 h; the obtained black product was centrifuged, and washed with water and ethanol three times respectively, at 45 o C and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

Embodiment 3

[0029] Example 3: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.500 mmol Co(NO 3 ) 2 . 6H 2 O and 0.250 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 3 h; the obtained black product was centrifuged, and washed with water and ethanol for 3 times, at 45 oC and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

technical field

[0001] The invention belongs to the field of preparation of nanocomposite materials, in particular to a porous sheet NiCo 2 o 4 / The preparation method of graphene composite capacitance material. Background technique

[0002] At present, with the rapid development of the economy, the social problems caused by energy shortages are becoming more and more prominent, making people's demand for continuous and efficient energy storage devices more urgent; supercapacitors have short charging time, long service life, The characteristics of good temperature characteristics, energy saving and environmental protection have attracted widespread attention and have broad application prospects; the electrode materials for supercapacitors are usually metal oxides and conductive polymers, but these electrode materials are due to their own Small capacitance and poor conductivity restrict its popularization and application in supercapacitors; in recent years, studies have fou...

Examples

Embodiment 1

[0027] Example 1: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.250 mmol Co(NO 3 ) 2 . 6H 2 O and 0.125 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 3 h; the obtained black product was centrifuged, and washed with water and ethanol for 3 times, at 45 o C and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

Embodiment 2

[0028] Example 2: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.250 mmol Co(NO 3 ) 2 . 6H 2 O and 0.125 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 4 h; the obtained black product was centrifuged, and washed with water and ethanol three times respectively, at 45 o C and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

Embodiment 3

[0029] Example 3: 60 mg of graphite oxide was dispersed in 40 mL of deionized aqueous solution, and a uniform dispersion was formed by ultrasonication; 10 mL of 0.500 mmol Co(NO 3 ) 2 . 6H 2 O and 0.250 mmol Ni(NO 3 ) 2 . 6H 2 The aqueous solution of O was slowly added dropwise to the above dispersion liquid, and stirred fully; then 10 mL of aqueous solution containing 0.21 g hexamethylenetetramine was slowly added dropwise to the above mixed liquid, and continued to stir for 10 min; the mixed solution was transferred to reflux Reactor, 90 o C for 3 h; the obtained black product was centrifuged, and washed with water and ethanol for 3 times, at 45 oC and dried under vacuum; the ground powder was calcined at 330 °C for 2 h in the air atmosphere to obtain porous sheet NiCo 2 o 4 / Graphene composite capacitor material.

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