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A kind of carbon nanotube composite material with hierarchical structure and its preparation method

A technology of carbon nanotubes and hierarchical structure, which is applied in the field of carbon nanotube composite materials with hierarchical structure and its preparation, to achieve high capacitance retention rate, shortened charge transfer distance, and good uniformity of tube diameter distribution

Active Publication Date: 2022-04-05
ANHUI SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density level of carbon nanotube-based supercapacitors still needs to be improved to meet the application requirements

Method used

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  • A kind of carbon nanotube composite material with hierarchical structure and its preparation method
  • A kind of carbon nanotube composite material with hierarchical structure and its preparation method
  • A kind of carbon nanotube composite material with hierarchical structure and its preparation method

Examples

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Embodiment 1

[0042] A carbon nanotube composite material with a hierarchical structure and a preparation method thereof, the steps are as follows:

[0043] Step 1: Preparation of Catalyst

[0044] Ni(NO 3 ) 2 and Mg(NO 3 ) 2 Dissolved in deionized water, making the Ni 2+ and Mg 2+ The sum of the concentrations is 0.2mol / L, then add 2.5mol / L sodium hydroxide solution to obtain a mixed solution, the volume ratio of sodium hydroxide solution and deionized water is 1:4, and then reflux the mixed solution at 95°C for 12h , and then filtered, the filtered product was washed with deionized water and freeze-dried, the product was separated in air, calcined at 600 °C for 2 h, and then in H 2 Continue calcination at the same temperature for 35 min under a mixed atmosphere with Ar to obtain a Ni nanoparticle product supported by MgO as a substrate, which is a Ni / MgO catalyst, and the H 2 The gas flows of Ar and Ar are 100mL / min and 300~330mL / min respectively, and the H 2 The flow rate of Ar a...

Embodiment 2

[0062] A carbon nanotube composite material with a hierarchical structure and a preparation method thereof, the steps are as follows:

[0063] Step 1: Preparation of Catalyst

[0064] Ni(NO 3 ) 2 and Mg(NO 3 ) 2 Dissolved in deionized water, making the Ni 2+ and Mg 2+ The sum of the concentrations is 0.2mol / L, then add 2.5mol / L sodium hydroxide solution to obtain a mixed solution, the volume ratio of sodium hydroxide solution and deionized water is 1:4, and then reflux the mixed solution at 95°C for 12h , and then filtered, the filtered product was washed with deionized water and freeze-dried, the product was separated in air, calcined at 620 °C for 2 h, and then heated in H 2 Continue calcination at the same temperature for 40 min under a mixed atmosphere with Ar to obtain a Ni nanoparticle product supported by MgO as a substrate, which is a Ni / MgO catalyst, and the H 2 The gas flows of Ar and Ar are 110mL / min and 330mL / min respectively;

[0065] Step 2: Preparation o...

Embodiment 3

[0070] A carbon nanotube composite material with a hierarchical structure and a preparation method thereof, the steps are as follows:

[0071] Step 1: Preparation of Catalyst

[0072] Ni(NO 3 ) 2 and Mg(NO 3 ) 2 Dissolved in deionized water, making the Ni 2+ and Mg 2+ The sum of the concentrations is 0.2mol / L, then add 2.5mol / L sodium hydroxide solution to obtain a mixed solution, the volume ratio of sodium hydroxide solution and deionized water is 1:4, and then reflux the mixed solution at 95°C for 12h , and then filtered, the filtered product was washed with deionized water and freeze-dried, the product was separated in air, calcined at 600 °C for 2 h, and then in H 2 Continue calcination at the same temperature for 30 min under a mixed atmosphere with Ar to obtain a Ni nanoparticle product supported by MgO as a substrate, which is a Ni / MgO catalyst, and the H 2 The flow rates of Ar and Ar are 120mL / min and 360mL / min respectively;

[0073] Step 2: Preparation of Hier...

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Abstract

A carbon nanotube composite material with a hierarchical structure, characterized in that: the carbon nanotubes of the hierarchical structure are composed of thin carbon nanotubes with a diameter of 5-10nm and thick carbon nanotubes with a diameter of about 200nm, The thick carbon nanotubes have a branch structure, and the thin nanotubes are helically wound on the surface of the thick carbon nanotubes. The carbon nanotube composite material with hierarchical structure of the present invention improves the electrochemical performance of the material, and its power density reaches 73.2Wh·kg ‑1 , when the current density is 1A / g, its specific capacitance is 252.6F / g, which is 1.4 times that of branched carbon nanotubes with a single thick tube diameter. It has excellent cycle stability and remains extremely high after 10,000 cycles. capacitance retention rate.

Description

technical field [0001] The invention relates to the technical field of carbon nanotubes, in particular to a carbon nanotube composite material with a hierarchical structure and a preparation method thereof. Background technique [0002] As the continuous development of implantable electronics and flexible electronics puts forward higher requirements for energy technology, supercapacitors have attracted extensive attention due to their unique properties. Especially in the field of flexible electronic products, supercapacitors have outstanding advantages over other energy storage devices, and can meet the special requirements of flexible electronic devices. The development of electrode materials with hierarchical and diverse nanostructures to improve the performance of supercapacitors has become a research hotspot in recent years. Among them, carbon nanomaterials are widely used as electrode materials to prepare supercapacitors based on their high conductivity and high specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/36H01G11/86
CPCH01G11/36H01G11/86Y02E60/13
Inventor 周永生靳盼傅友福徐慰郭雨丁志杰魏居孟
Owner ANHUI SCI & TECH UNIV
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