Method for preparing activated carbon for biomass-based super capacitor

A supercapacitor, a technology for producing activated carbon, used in capacitors, electrolytic capacitors, circuits, etc.

Inactive Publication Date: 2011-10-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the basis of previous work, the present invention takes biomass as a raw material, first acid-treats the biomass, then utilizes its hydrolyzate for in-situ polycondensation and carbonization, and activates

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0011] Embodiment 1: rice husk and 72%H 2 SO 4 Mix according to a solid-liquid ratio of 1:10 (Kg / L), place in a 50°C water bath for 10 minutes, adjust the acid concentration to 52%, and filter to obtain a sugar-acid solution; then place the sugar-acid solution in a 95°C water bath for carbonization React for 6 hours, filter, wash with water, and dry to obtain hydrothermal carbon. After heat-treating the hydrothermal carbon at 500°C, mix it with potassium hydroxide in a mass ratio of 1:3, react at 400°C for 0.5 hour, and activate the reaction at 800°C for 1 hour, solid Filtration, washing, drying, the preparation specific surface area is 2185m 2 / g, activated carbon for supercapacitors with a specific capacitance of 225F / g.

Embodiment 2

[0012] Embodiment 2: change hydrothermal carbon and activator consumption ratio to be 1: 4, other conditions are the same as embodiment 1, prepare specific surface area and be 2435m 2 / g, activated carbon for supercapacitors with a specific capacitance of 256F / g.

Embodiment 3

[0013] Embodiment 3: change hydrothermal carbon and activator consumption ratio to be 1: 5, other conditions are the same as embodiment 1, prepare specific surface area and be 3276m 2 / g, activated carbon for supercapacitors with a specific capacitance of 272F / g.

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Abstract

The invention discloses a method for preparing activated carbon for a biomass-based super capacitor, in particular relates to a new method for preparing activated carbon with high specific surface area and high specific capacitance by the steps of hydrolysis of biomass with concentrated acid, in-situ polycondensation and carbonization of saccharic acid solution and activation under certain conditions. The method comprises the following specific steps of: firstly, hydrolyzing biomasses with inorganic acid with a certain concentration, and filtering to obtain a saccharic acid solution and filter residues; adjusting the concentration of the saccharic acid solution, performing polycondensation and carbonization to prepare hydrothermal carbon; mixing the hydrothermal carbon with an activating agent in a certain mass ratio for activating to finally obtain the activated carbon for the super capacitor. The method for preparing activated carbon for the super capacitor by using biomasses is a pollution-free process route meeting the requirement of sustainable development.

Description

technical field [0001] The invention relates to a method for preparing activated carbon for a biomass-based supercapacitor, in particular to a method for preparing activated carbon with high specific surface area and high specific capacitance by hydrolyzing biomass with concentrated acid, in-situ polycondensation carbonization of sugar-acid solution, and activation treatment under certain conditions. A new approach to activated carbon. Background technique [0002] Today, with the rapid development of social economy and the increasing shortage of resources, the new energy storage element supercapacitor has been developed rapidly, which makes up for the low power of batteries and fuel cells, poor resistance to high current charge and discharge, and traditional capacitors. The energy storage density is small. Disadvantages, the continuous application in the fields of electric vehicles, mobile communications, information technology, aerospace and national defense technology has...

Claims

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Application Information

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IPC IPC(8): C01B31/12H01G9/042
CPCY02E60/13
Inventor 郭玉鹏王丽丽王子忱丁雪峰朱燕超赵旭
Owner JILIN UNIV
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