Flower-like nanocomposite material, preparation method thereof, electrode material and preparation method thereof

Abstract

The invention provides a flower-like nanocomposite material. The flower-like nanocomposite material is obtained by compounding materials including nickel hydroxide, graphite-like carbon nitride and graphene oxide, and is flower-like. When the flower-like nanocomposite material provided by the invention is used as an electrode material of a supercapacitor, the material has relatively high electrochemical performance. The results in the embodiment show that the flower-like nanocomposite material provided by the invention has relatively high cyclic stability as an electrode material. After 1000 cycles of charging and discharging, the capacity retention rate of the electrode material reaches 74.3 percent, showing high cyclic stability. In addition, the flower-like nanocomposite material provided by the invention has relatively high energy density, and the specific capacitance is 473.3F / g to 543.8F / g at the current density of 1A / g.

Description

technical field

[0001] The invention relates to the field of nanomaterials, in particular to a flower-shaped nanocomposite material and a preparation method thereof, an electrode material and a preparation method thereof. Background technique

[0002] With the rapid development of modern human society, environmental pollution and energy crisis have become two daunting challenges that human development must face. Due to its high power density, long cycle life and wide temperature range, supercapacitors have become a research hotspot to meet the challenges. However, the low energy density of supercapacitors limits their further development. Therefore, finding new electrode active materials to increase the energy density of supercapacitors is a topic that scientists are most concerned about at present.

[0003] The commonly used supercapacitor electrode materials are carbon-based materials, conductive polymers and metal oxides. Graphene is currently the most researched carbon...

Examples

preparation example Construction

[0036] The present invention also provides a preparation method of the flower-shaped nanocomposite material described in the above technical solution, comprising the following steps:

[0037] (1) Dispersing and mixing nickel nitrate, graphite oxide and graphite-like phase carbon nitride in water, adjusting the pH value of the mixture to 9-11 to obtain a dispersion;

[0038] (2) Under airtight conditions, heat-treat the dispersion liquid obtained in the step (1) to obtain a flower-like nanocomposite material.

[0039] The invention mixes nickel nitrate, graphite oxide and graphite-like phase carbon nitride in water to obtain a mixed solution.

[0040]In the present invention, the preparation method of the graphite-like carbon nitride preferably comprises the following steps:

[0041] (a) Calcining the urea, grinding the calcined product and dispersing it in water to obtain a suspension;

[0042] (b) Under airtight conditions, heat-treat the suspension obtained in the step (a)...

Embodiment 1

[0073] Graphite oxide (GO) was prepared by modified Hummers method using 325 mesh graphite powder as raw material. The urea was ground, moved into a crucible, wrapped the crucible with tinfoil, and calcined in a muffle furnace at a high temperature of 500°C for 3 hours, and the product was ground in deionized water and ultrasonically dispersed to form a suspension to obtain a 2.5 mg / mL solution. Move it into a polytetrafluoroethylene reactor, react at 180°C for 10 hours, and obtain graphite-like carbon nitride (g-C 3 N 4 ). Weigh 50 mg of graphite oxide (GO) and 50 mg of graphite-like carbon nitride (g-C 3 N 4 ), ultrasonic treatment in 100ml deionized water, ultrasonic time is 30min, ultrasonic power is 540W, obtain 1mg / mL suspension, press Ni(OH) 2 , g-C 3 N 4 Calculate and weigh an appropriate amount of nickel nitrate to prepare nickel nitrate aqueous solution with a mass ratio of 16:1:1 to RGO, and move the nickel nitrate aqueous solution into graphite oxide (GO) and...

Embodiment 2

[0075] Graphite oxide (GO) was prepared by modified Hummers method using 325 mesh graphite powder as raw material. The urea was ground, moved into a crucible, wrapped the crucible with tinfoil, and calcined in a muffle furnace at a high temperature of 500°C for 3 hours, and the product was ground in deionized water and ultrasonically dispersed to form a suspension to obtain a 2.5 mg / mL solution. Move it into a polytetrafluoroethylene reactor, react at 185°C for 10 hours, and obtain graphite-like carbon nitride (g-C 3 N 4 ). Weigh 50 mg of graphite oxide (GO) and 50 mg of graphite-like carbon nitride (g-C 3 N 4 ), ultrasonic treatment in 100ml deionized water, ultrasonic time is 30min, ultrasonic power is 540W, obtain 1mg / mL suspension, press Ni(OH) 2 , g-C 3 N 4, RGO mass ratio is 16:1:1 Calculate and weigh an appropriate amount of nickel nitrate to configure nickel nitrate aqueous solution, move the nickel nitrate aqueous solution into graphite oxide (GO) and graphite-l...

technical field

[0001] The invention relates to the field of nanomaterials, in particular to a flower-shaped nanocomposite material and a preparation method thereof, an electrode material and a preparation method thereof. Background technique

[0002] With the rapid development of modern human society, environmental pollution and energy crisis have become two daunting challenges that human development must face. Due to its high power density, long cycle life and wide temperature range, supercapacitors have become a research hotspot to meet the challenges. However, the low energy density of supercapacitors limits their further development. Therefore, finding new electrode active materials to increase the energy density of supercapacitors is a topic that scientists are most concerned about at present.

[0003] The commonly used supercapacitor electrode materials are carbon-based materials, conductive polymers and metal oxides. Graphene is currently the most researched carbon...

Examples

preparation example Construction

[0036] The present invention also provides a preparation method of the flower-shaped nanocomposite material described in the above technical solution, comprising the following steps:

[0037] (1) Dispersing and mixing nickel nitrate, graphite oxide and graphite-like phase carbon nitride in water, adjusting the pH value of the mixture to 9-11 to obtain a dispersion;

[0038] (2) Under airtight conditions, heat-treat the dispersion liquid obtained in the step (1) to obtain a flower-like nanocomposite material.

[0039] The invention mixes nickel nitrate, graphite oxide and graphite-like phase carbon nitride in water to obtain a mixed solution.

[0040]In the present invention, the preparation method of the graphite-like carbon nitride preferably comprises the following steps:

[0041] (a) Calcining the urea, grinding the calcined product and dispersing it in water to obtain a suspension;

[0042] (b) Under airtight conditions, heat-treat the suspension obtained in the step (a)...

Embodiment 1

[0073] Graphite oxide (GO) was prepared by modified Hummers method using 325 mesh graphite powder as raw material. The urea was ground, moved into a crucible, wrapped the crucible with tinfoil, and calcined in a muffle furnace at a high temperature of 500°C for 3 hours, and the product was ground in deionized water and ultrasonically dispersed to form a suspension to obtain a 2.5 mg / mL solution. Move it into a polytetrafluoroethylene reactor, react at 180°C for 10 hours, and obtain graphite-like carbon nitride (g-C 3 N 4 ). Weigh 50 mg of graphite oxide (GO) and 50 mg of graphite-like carbon nitride (g-C 3 N 4 ), ultrasonic treatment in 100ml deionized water, ultrasonic time is 30min, ultrasonic power is 540W, obtain 1mg / mL suspension, press Ni(OH) 2 , g-C 3 N 4 Calculate and weigh an appropriate amount of nickel nitrate to prepare nickel nitrate aqueous solution with a mass ratio of 16:1:1 to RGO, and move the nickel nitrate aqueous solution into graphite oxide (GO) and...

Embodiment 2

[0075] Graphite oxide (GO) was prepared by modified Hummers method using 325 mesh graphite powder as raw material. The urea was ground, moved into a crucible, wrapped the crucible with tinfoil, and calcined in a muffle furnace at a high temperature of 500°C for 3 hours, and the product was ground in deionized water and ultrasonically dispersed to form a suspension to obtain a 2.5 mg / mL solution. Move it into a polytetrafluoroethylene reactor, react at 185°C for 10 hours, and obtain graphite-like carbon nitride (g-C 3 N 4 ). Weigh 50 mg of graphite oxide (GO) and 50 mg of graphite-like carbon nitride (g-C 3 N 4 ), ultrasonic treatment in 100ml deionized water, ultrasonic time is 30min, ultrasonic power is 540W, obtain 1mg / mL suspension, press Ni(OH) 2 , g-C 3 N 4, RGO mass ratio is 16:1:1 Calculate and weigh an appropriate amount of nickel nitrate to configure nickel nitrate aqueous solution, move the nickel nitrate aqueous solution into graphite oxide (GO) and graphite-l...

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