ZIF-8 pyrolysis porous carbon-graphene composite material, manufacturing method and application thereof

A composite material, ZIF-8 technology, applied in the field of nanomaterials, can solve the problems of low energy density, low capacity and poor rate, and achieve the effect of high energy density, high power density and good rate.

Inactive Publication Date: 2017-05-31
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for preparing graphene are direct carbonization of organic matter and reduction of graphene oxide. Graphene is a macroporous material and is easy to form a network structure; however, pure graphene as an electrode material often has low specific capacity, poor rate performance, and low low density

Method used

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  • ZIF-8 pyrolysis porous carbon-graphene composite material, manufacturing method and application thereof
  • ZIF-8 pyrolysis porous carbon-graphene composite material, manufacturing method and application thereof
  • ZIF-8 pyrolysis porous carbon-graphene composite material, manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Mix zinc nitrate hexahydrate and 2-methylimidazole and dissolve them in methanol. The mass ratio of zinc nitrate hexahydrate, 2-methylimidazole and methanol is 1:8:700.

[0034] (2) The solution was left standing for 1 h to obtain a milky solution.

[0035] (3) The obtained solution was centrifuged at a speed of 10000 rpm for 10 min, and then washed three times with methanol to obtain ZIF-8 crystals.

[0036] (4) Dry the obtained ZIF-8 crystal; wherein, the drying temperature is 60° C., and the vacuum degree is -0.1 MPa.

[0037] (5) Mix the prepared ZIF-8 crystal with potassium citrate at a mass ratio of 1:20, and grind to obtain a uniform white powder.

[0038] (6) The obtained white powder was heated up to 800°C at 5°C / min under a nitrogen atmosphere, kept for 2h, and carbonized to prepare a ZIF-8 pyrolytic porous carbon-graphene composite.

[0039] (7) Wash the prepared ZIF-8 pyrolyzed porous carbon-graphene composite with 0.5 mol / L hydrochloric acid for 6 h, ...

Embodiment 2

[0043] (1) Mix zinc nitrate hexahydrate and 2-methylimidazole and dissolve them in methanol. The mass ratio of zinc nitrate hexahydrate, 2-methylimidazole and methanol is 1:8:700.

[0044] (2) The solution was left standing for 1 h to obtain a milky solution.

[0045] (3) The obtained solution was centrifuged at a speed of 10000 rpm for 10 min, and then washed three times with methanol to obtain ZIF-8 crystals.

[0046] (4) Dry the obtained ZIF-8 crystal; wherein, the drying temperature is 60° C., and the vacuum degree is -0.1 MPa.

[0047] (5) Mix the prepared ZIF-8 crystal with potassium citrate at a mass ratio of 1:5, and grind to obtain a uniform white powder.

[0048] (6) The obtained white powder was heated up to 800°C at 5°C / min under a nitrogen atmosphere, kept for 2h, and carbonized to prepare a ZIF-8 pyrolytic porous carbon-graphene composite material.

[0049] (7) The prepared ZIF-8 pyrolytic porous carbon-graphene composite material was washed with 0.5 mol / L hydr...

Embodiment 3

[0051] (1) Mix zinc nitrate hexahydrate and 2-methylimidazole and dissolve them in methanol. The mass ratio of zinc nitrate hexahydrate, 2-methylimidazole and methanol is 1:8:700.

[0052] (2) The solution was left standing for 1 h to obtain a milky solution.

[0053](3) The obtained solution was centrifuged at a speed of 10000 rpm for 10 min, and then washed three times with methanol to obtain ZIF-8 crystals.

[0054] (4) Dry the obtained ZIF-8 crystal; wherein, the drying temperature is 60° C., and the vacuum degree is -0.1 MPa.

[0055] (5) Mix the prepared ZIF-8 crystal with potassium citrate at a mass ratio of 1:40, and grind to obtain a uniform white powder.

[0056] (6) The obtained white powder was heated up to 800°C at 5°C / min under a nitrogen atmosphere, kept for 2h, and carbonized to prepare a ZIF-8 pyrolytic porous carbon-graphene composite material.

[0057] (7) The prepared ZIF-8 pyrolytic porous carbon-graphene composite material was washed with 0.5 mol / L hydr...

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Abstract

The invention relates to a ZIF-8 pyrolysis porous carbon-graphene composite material, a manufacturing method and an application thereof. The structure of the composite material is characterized in that graphene is wrapped on a surface of ZIF-8 pyrolysis porous carbon. The manufacturing method comprises the following steps of mixing zinc nitrate hexahydrate and 2-methylimidazole and dissolving in a solvent; standing for 1-2hs and acquiring a milk-shape solution; centrifuging, washing, carrying out vacuum drying and acquiring ZIF-8 crystal; and mixing the ZIF-8 crystal and potassium citrate, grinding, carrying out high temperature carbonization and acid pickling, drying and acquiring the material. The manufacturing method is simple and cost is low. The acquired ZIF-8 pyrolysis porous carbon-graphene composite material possesses advantages that a chemical property is stable, a capacitive character is good, a specific surface area is high and so on. A hierarchical pore and a three-dimensional conducting framework are fully used to increase electrochemical performance. Under a 1A/g current density, a specific capacitance reaches 300F/g. The material is an ideal high performance electrode material of a super capacitor.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a ZIF-8 pyrolytic porous carbon-graphene composite material and its preparation method and application. Background technique [0002] Zeolite imidazolate framework structure has excellent physical and chemical properties, such as high porosity and specific surface area, good chemical stability and so on. These special properties make it widely used in the field of electrochemistry. [0003] In the prior art, pure ZIF-8 pyrolytic porous carbon is obtained by direct carbonization of ZIF-8 crystals; however, pure ZIF-8 pyrolytic porous carbon is relatively dispersed, and its specific capacity is low when used as an electrode material for a supercapacitor. Poor magnification. [0004] Graphene is a two-dimensional crystal made of carbon atoms. Pure graphene materials are two-dimensional macroporous materials. At present, the methods for preparing graphene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/36H01G11/86C01B32/184C01B32/05
CPCY02E60/13H01G11/24C01B2204/22C01P2004/03C01P2006/12C01P2006/40H01G11/32H01G11/36H01G11/86
Inventor 刘天西赵哲张超刘思良
Owner DONGHUA UNIV
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