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Preparation method of graded porous graphene material for super-capacitor

A supercapacitor, hierarchical porous technology, applied in graphene, nano-carbon and other directions, can solve the problems of cumbersome peeling and pressing molding process, high price of raw material - graphite oxide, cumbersome preparation process, etc., to achieve obvious energy saving effect, increase capacity and Rate performance, effect of simplifying preparation steps

Active Publication Date: 2014-03-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method produces active graphene materials, the price of the raw material used in the method-graphite oxide is high, the stripping and compression molding process of the reactant is cumbersome, and the production cost is high
[0005] Generally speaking, the above methods all use graphite or graphite oxide indirectly as raw materials to prepare graphene materials. The raw material preparation process is cumbersome and the production cost is very high.

Method used

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  • Preparation method of graded porous graphene material for super-capacitor
  • Preparation method of graded porous graphene material for super-capacitor
  • Preparation method of graded porous graphene material for super-capacitor

Examples

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Effect test

Embodiment 1

[0021] Embodiment 1: hierarchical porous graphene material HPG 4.2-16.8-6-ZnO Concrete preparation process is as follows:

[0022] (1) Pretreatment of reactants: After grinding the coal tar pitch, weigh 4.2g of coal tar pitch with a particle size of less than 74μm and put it into a mortar, add 16.8g of nano-zinc oxide, and then add 6g of solid potassium hydroxide. After the three reactants were mixed and ground for 1 hour, they were placed in a ball mill and ball milled at a speed of 303 r / min for 20 minutes to obtain the reactants;

[0023] (2) Preparation of hierarchical porous graphene material: Put the reactant obtained in step (1) into a porcelain boat, place it in a tube furnace, first pass nitrogen gas for 5 minutes to exhaust the air in the tube furnace, and then stop Ventilate nitrogen, turn on the vacuum pump to reduce the pressure in the tube furnace from normal pressure to -0.1MPa, heat up to 150°C at a heating rate of 5°C / min, keep the temperature for 0.5h, and c...

Embodiment 2

[0024] Embodiment 2: hierarchical porous graphene HPG 7-14-6-ZnO Concrete preparation process is as follows:

[0025] (1) Pretreatment of reactants: implemented in the same manner as step (1) in Example 1. The difference is that the weighed coal tar pitch is 7g, and the nanometer zinc oxide is 14g.

[0026] (2) According to the same method as step (2) in Example 1, the obtained hierarchical porous graphene material is marked as HPG 7-14-6-ZnO .

Embodiment 3

[0027] Embodiment 3: hierarchical porous graphene HPG 9-12-6-ZnO Concrete preparation process is as follows:

[0028] (1) Pretreatment of reactants: implemented in the same manner as step (1) in Example 1. The difference is that the weighed coal tar pitch is 9g, and the nanometer zinc oxide is 12g.

[0029] (2) According to the same method as step (2) in Example 1, the obtained hierarchical porous graphene material is marked as HPG 9-12-6-ZnO .

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Abstract

The invention discloses a preparation method of a graded porous graphene material for a super-capacitor, belonging to the technical field of preparation of carbon materials. The graded porous graphene material for the super-capacitor is prepared by taking coal asphalt as a carbon source, taking nano zinc oxide or nano iron sesquioxide formed by a transitional metal as a template, taking potassium hydroxide as an activator, transferring a grinded mixture of the three into a porcelain boat, placing the porcelain boat in a tubular furnace for heating under a negative-pressure condition through a one-step process. A specific surface area of the graded porous graphene material is between 664m<2> / g and 1862 m<2> / g, total pore volume is between 0.51 cm<3> / g and 1.60 cm<3> / g, average pore size is between 2.53 nm and 5.91 nm, and yield of the graded porous graphene is between 16.9% and 62.8%. According to the preparation method disclosed by the invention, the cheap coal asphalt is taken as the material, preparation process is greatly simplified and operation safety is increased. The preparation method disclosed by the invention has the advantages of being simple in process, low in cost, suitable for industrial production, and the like.

Description

Technical field: [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a method for preparing a hierarchical porous graphene material for supercapacitors. Background technique: [0002] Supercapacitors are also called electric double layer capacitors or electrochemical capacitors. It is mainly composed of an electrode composed of a current collector carrying an active material, a separator placed between the two electrodes, and an electrolyte. The current electrode materials for supercapacitors are mainly carbon-based materials with large specific surface areas, including activated carbon, carbon aerogel, and carbon nanotubes. However, the above-mentioned carbon-based materials are limited in their application in supercapacitors due to the complex production process, high cost or unsatisfactory specific capacitance. [0003] Graphene is a new type of carbon nanomaterial with a two-dimensional single atomic layer th...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184
Inventor 何孝军韩久凤张和宝
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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