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Method for preparing activated carbon for supercapacitors from camphor tree leaves

A technology of supercapacitor and activated carbon, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of high energy consumption, small specific surface area of ​​activated carbon, and limited application of supercapacitors, and achieves easy availability of raw materials and equipment cost. Low, maneuverable effects

Inactive Publication Date: 2015-07-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the Second World War, with the rapid development of microelectronics and integrated circuits, the performance of traditional capacitors in some applications was difficult to meet the demand, so capacitors with larger capacity were needed as backup power for these components, and the development of large-capacity, Smaller capacitors are imperative
This method also consumes a lot of energy, and the specific surface area of ​​the prepared activated carbon is small, which limits its application in supercapacitors.
[0008] At present, there is no open technology for preparing activated carbon for supercapacitors with camphor leaves as raw material and phosphoric acid as activator

Method used

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  • Method for preparing activated carbon for supercapacitors from camphor tree leaves
  • Method for preparing activated carbon for supercapacitors from camphor tree leaves
  • Method for preparing activated carbon for supercapacitors from camphor tree leaves

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Embodiment 1

[0031] (1) After the raw material camphor leaves are washed with water to remove surface dust, they are dried in a blast drying oven at 80°C, and then the dried camphor leaves are broken into strip-shaped leaves with a width and length of 2-5mm using a crushing and shearing machine debris;

[0032] (2) Place the dried and crushed raw materials in step (1) in a tube furnace, carbonize and activate for 1 hour at 550°C under the protection of nitrogen;

[0033] (3) Grind the carbonized raw materials in step (2), wash and filter with deionized water, wash the filter residue with 1mol / L hydrochloric acid solution at 30°C under stirring, and finally wash with deionized water until pH=6~7 ; The filter residue is first dried in a blast oven at 80°C for 12 hours, and finally dried in a vacuum oven at 120°C for 12 hours to obtain the finished activated carbon with a specific surface area of ​​311.32m 2 / g, at a discharge current of 300mA / g, its specific capacity can reach 15.57F / g.

Embodiment 2

[0035](1) After the raw material camphor leaves are washed with water to remove surface dust, they are dried in a blast drying oven at 80°C, and then the dried camphor leaves are broken into strips with a width and length of 2 to 5 mm using a crushing and shearing machine Fragments; broken raw materials, soaked in an appropriate amount of 6mol / L acid solution for 12 to 24 hours, and then dried at 140°C;

[0036] (2) Place the impregnated and dried raw materials in step (1) in a tube furnace, carbonize and activate for 1 hour at 500-550°C under the protection of nitrogen;

[0037] (3) Grind the carbonized raw materials in step (2), wash and filter with deionized water, wash the filter residue with 1~3mol / L hydrochloric acid solution at 40°C under stirring, and finally wash with deionized water until pH=6 ~7; The filter residue is first dried in a blast oven at 80°C for 12 hours, and finally dried in a vacuum oven at 120°C for 12 hours to obtain the finished activated carbon wit...

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Abstract

The invention discloses a method for preparing activated carbon for supercapacitors from camphor tree leaves. The camphor tree leaves are taken as raw materials, and the activated carbon is obtained through water washing, drying, acid leaching, carbonization, acid picking and drying treatment. The raw materials, namely, the camphor tree leaves, are washed and dried after collected and crushed into strip-shaped leaf fragments with the width and the length ranging from 2 mm to 5 mm, and the strip-shaped leaf fragments are carbonized and activated in the nitrogen atmosphere at the temperature of 400-700 DEG C for 0.5-2 h; a carbonized material is washed with deionized water, and filter residues are collected; the filter residues are washed with 1-3 mol / L of an acid solution at the temperature of 30-60 DEG C while stirring, finally washed with deionized water until the pH is in a range of 6-7 and subjected to vacuum drying, and the finished product, namely, the activated carbon, is obtained. The specific surface area of the prepared activated carbon is in a range of 963.70-1424.19 m<2> / g, the specific capacity of the activated carbon is up to 95-120 F / g under the discharge current of 300 mA / g, and the activated carbon is applicable to production of double-electric-layer supercapacitors. With the adoption of the method, the camphor tree leaves are collected and utilized, pollution caused by incineration disposal is avoided, and resources are effectively utilized.

Description

technical field [0001] The invention relates to a method for preparing activated carbon for supercapacitors from leaves of camphor trees, which belongs to the field of chemical preparation and chemical power supply, and specifically relates to the technical field of electrode material preparation. Background technique [0002] Energy is the main driving force for the development of human society. Throughout the history of human development, every innovation in energy technology has caused major changes in social productivity and production relations, thus promoting the development of history. However, due to the rapid development of industrialization and the unrestrained exploitation of fossil fuels such as coal, oil, and natural gas, a series of problems such as resource shortage and environmental pollution have been caused, and the development and use of renewable energy have received increasing attention. Therefore, it is particularly important to use biomass as a raw ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12H01G11/34H01G11/84
CPCY02E60/13
Inventor 何捍卫潘登宇徐然冉敏
Owner CENT SOUTH UNIV
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