Preparation method of spongy porous carbon material for supercapacitors

A porous carbon material, supercapacitor technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of not exerting the value of rice husks, pollute the environment, etc., and achieve the effects of being suitable for large-scale industrial production, low energy consumption, and mild reaction conditions

Inactive Publication Date: 2016-08-10
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a large agricultural country in my country, rice husk is an extremely common agricultural by-product. Most of the r

Method used

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  • Preparation method of spongy porous carbon material for supercapacitors
  • Preparation method of spongy porous carbon material for supercapacitors
  • Preparation method of spongy porous carbon material for supercapacitors

Examples

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Effect test

Embodiment 1

[0028] Soak the washed rice husk in 1mol / L HF solution, keep stirring in a water bath at 80°C for 2 hours, wash it with deionized water until neutral, put it in a 60°C oven and dry it for 24 hours, then KOH and Rice husks were mixed at a mass ratio of 3:1, and appropriate water was added, dried at 60 °C for more than 24 hours, and the dried samples were activated at 700 °C for 1 hour under nitrogen protection, cooled to room temperature with the furnace, and deionized water Wash with 1mol / L dilute hydrochloric acid until neutral, filter, and dry at 60°C to obtain porous carbon.

Embodiment 2

[0030] Soak the washed rice husk in 1mol / L HF solution, keep stirring in a water bath at 80°C for 2 hours, wash it with deionized water until neutral, put it in a 60°C oven and dry it for 24 hours, then KOH and Rice husks were mixed at a mass ratio of 3:1, and appropriate water was added, dried at 60 °C for more than 24 hours, and the dried samples were activated at 800 °C for 1 hour under the protection of nitrogen, cooled to room temperature with the furnace, and deionized water Wash with 1mol / L dilute hydrochloric acid until neutral, filter, and dry at 60°C to obtain porous carbon.

Embodiment 3

[0032] Soak the washed rice husk in 1mol / L HF solution, keep stirring in a water bath at 80°C for 2 hours, wash it with deionized water until neutral, put it in a 60°C oven and dry it for 24 hours, then KOH and Rice husks were mixed at a mass ratio of 3:1, and appropriate water was added, dried at 60°C for more than 24 hours, and the dried samples were activated at 900°C for 1 hour under the protection of nitrogen, cooled to room temperature with the furnace, and deionized water Wash with 1mol / L dilute hydrochloric acid until neutral, filter, and dry at 60°C to obtain porous carbon.

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Abstract

A method for preparing a spongy porous carbon material for a supercapacitor, comprising the following steps: cleaning the rice husk with deionized water to remove dust, and then dispersing the rice husk in an HF solution, and continuously stirring in a water bath to remove the dust from the rice husk. the ash content; filter and wash to obtain deashed rice husk; mix deashed rice husk with activator according to a certain mass ratio, then add water to make it evenly mixed, and obtain a mixture of rice husk and alkali after drying; mix the mixture in Carry out high-temperature activation treatment under the protection of nitrogen atmosphere, wash with deionized water, filter and dry to obtain a porous carbon material. The sponge-like porous carbon prepared by the invention has high specific surface area, good pore size distribution, and good electrochemical performance. The preparation has mild reaction conditions, low energy consumption, simple steps and easy operation, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of spongy porous carbon and its application as a supercapacitor electrode material. Background technique [0002] A supercapacitor is a new type of energy storage device and conversion device that is 20 to 200 times larger than a conventional capacitor. It is used as an energy storage to supplement some new energy sources such as photovoltaics, wind energy, and fuel cells. It has received extensive attention due to its long discharge life and high safety performance. [0003] At present, the mainstream supercapacitors can be divided into two categories: pseudocapacitors and electric double layer capacitors (EDLC). Since the electrode materials of pseudocapacitors are more expensive than EDLCs, EDLCs are currently the main researched supercapacitors. The main electrode material of EDLC is carbon material. The commonly used carbon electrode m...

Claims

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Application Information

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IPC IPC(8): C01B31/12H01G11/44
CPCY02E60/13H01G11/44C01P2004/03C01P2006/12C01P2006/17C01P2006/40
Inventor 肖衍和李林李盛菘
Owner NANCHANG UNIV
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