Method for preparing porous carbon material for supercapacitor by activating rice husk with ionic liquid

A technology for supercapacitors and ionic liquids, applied in the field of preparation of porous carbon materials for supercapacitors, can solve the problems of low overall utilization rate of rice husks, pollute the environment, waste resources, etc., and achieve easy product structure, simple preparation process, and raw material sources rich effect

Active Publication Date: 2015-11-04
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The world produces about 50 billion tons of rice every year, and rice husks account for about 20% of the total mass of rice. The overall utilization rate of rice husks in my country is low, and most of them are directly burned in rural areas, which not only pollutes the environment, but also wastes resources.

Method used

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  • Method for preparing porous carbon material for supercapacitor by activating rice husk with ionic liquid
  • Method for preparing porous carbon material for supercapacitor by activating rice husk with ionic liquid
  • Method for preparing porous carbon material for supercapacitor by activating rice husk with ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Porous carbon material PC 1 / 2 The specific preparation process is as follows:

[0021] (1) Pretreatment of reactants: 6g 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF 6 ) ionic liquid was added into 150mL of absolute ethanol, ultrasonically oscillated for 30min to dissolve it completely, then 12g of deashed rice husk was added, stirred and ultrasonically oscillated for 1h, and then the obtained raw material mixture was allowed to stand for 12h, then soaked for 3h under vacuum conditions, After drying at a constant temperature of 80°C for 12 hours, the reactant was obtained;

[0022] (2) Preparation of porous carbon material: put the reactant obtained in step (1) into a corundum porcelain boat, then place the corundum porcelain boat in a box furnace, feed nitrogen into the box furnace for 40 minutes in advance Then, the nitrogen flow rate was fixed at 60mL / min, and the box-type furnace was heated to 330°C at a heating rate of 3°C / min. The box-type furnace wa...

Embodiment 2

[0024] Porous carbon PC 1 / 1 The specific preparation process is as follows:

[0025](1) Pretreatment of reactants: implement according to the same method as step (1) in Example 1. The difference is that the quality of the ionic liquid weighed is 9g, and the quality of the rice husk is 9g;

[0026] (2) According to the same method as step (2) in Example 1, the resulting porous carbon material is marked as PC 1 / 1 . Porous carbon PC 1 / 1 The specific surface area is 988m 2 / g, the average pore diameter is 2.33nm. At a current density of 0.05 A / g in 6 M KOH electrolyte, PC 1 / 1 The specific volume of the electrode material reaches 209F / g; at a current density of 20A / g, PC 1 / 1 The specific volume of the electrode material reaches 162F / g.

Embodiment 3

[0028] Porous carbon PC 2 / 1 The specific preparation process is as follows:

[0029] (1) Pretreatment of reactants: implement according to the same method as step (1) in Example 1. The difference is that the quality of the ionic liquid weighed is 12g, and the quality of the rice husk is 6g;

[0030] (2) According to the same method as step (2) in Example 1, the resulting porous carbon is marked as PC 2 / 1 . Porous carbon PC 2 / 1 The specific surface area is 1375m 2 / g, the average pore diameter is 1.99nm. At a current density of 0.05 A / g in 6 M KOH electrolyte, PC 2 / 1 The specific volume of the electrode material reaches 256F / g; at a current density of 20A / g, PC 2 / 1 The specific volume of the electrode material reaches 67F / g.

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Abstract

The invention discloses a method for preparing a porous carbon material for a supercapacitor by activating rice husks through ionic liquid, belonging to the technical field of preparing a carbon material. The method comprises the following steps: by taking deashed rice husks as a carbon source, and 1-butyl-3-methylimidazole hexafluorophosphate ionic liquid as a template and activating agent, dissolving and dispersing the ionic liquid through absolute ethyl alcohol, then adding into the deashed rice husks, and then evaporating to completely remove absolute ethyl alcohol; transferring the obtained ionic liquid and rice husk mixture into a corundum porcelain boat, placing into a box type oven and heating under nitrogen atmosphere, to obtain the porous carbon material for the supercapacitor. For the porous carbon material, the specific surface area ranges from 697 to 1438m<2> / g, the total pore volume ranges from 0.51 to 0.75cm<3> / g, and the average pore size ranges from 1.99 to 2.95nm. The method has the advantages of being simple in preparation technology, easy for regulation and control of the product structure, capable of realizing the high added value of biomass, and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a preparation method of a porous carbon material for a supercapacitor. Background technique [0002] Supercapacitor has the advantages of high power density, long cycle life, fast charge and discharge rate, etc. It is a new type of energy storage element. It is mainly composed of an electrode composed of a current collector loaded with a porous 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 area, including porous carbon, carbon aerogel, and carbon nanotubes. Porous carbon materials are one of the preferred electrode materials for supercapacitors due to their good electrical conductivity, suitable pore size distribution and relatively low price. Ionic liquids are composed of organic cations, inorganic or o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 何孝军谢康余谟鑫王晓婷张小勇郑明东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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