Bamboo-based porous carbon/manganese dioxide nano composite electrode material for super capacitor and preparation method thereof

A supercapacitor and manganese dioxide technology, applied in the direction of hybrid capacitor electrodes, can solve the problems of single product structure, low capacitance performance, environmental pollution, etc., and achieve the effects of simple synthesis process, improved performance, and wide sources

Inactive Publication Date: 2020-05-19
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, it is necessary to develop a three-dimensional porous carbon / pseudocapacitive composite material preparation method starting from biomass precursors to solve the existing problems of high cost, environmental pollution, single product structure, and low capacitance performance.

Method used

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  • Bamboo-based porous carbon/manganese dioxide nano composite electrode material for super capacitor and preparation method thereof
  • Bamboo-based porous carbon/manganese dioxide nano composite electrode material for super capacitor and preparation method thereof
  • Bamboo-based porous carbon/manganese dioxide nano composite electrode material for super capacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The bamboo is processed into small pieces, cleaned to remove impurities, and then dried. Take about 2 g of small bamboo pieces and place them in a boat crucible, and carbonize in a tube furnace under a nitrogen atmosphere. The heating rate is 5℃ / min, and the carbonization temperature is 800℃, the carbonization time is 120 min. The carbonized product is mixed with potassium hydroxide solution, the ratio of alkali to carbon is 1:4, and it is immersed in a nickel crucible for 5 hours at 90°C for high temperature activation in a nitrogen atmosphere. The heating rate is 5°C / min and the activation temperature is 800 ℃, the activation time is 120 min, and the activated product is washed to neutrality and dried to obtain bamboo-based porous carbon. The bamboo-based porous carbon was immersed in a potassium permanganate / manganese sulfate solution with a molar ratio of 1:3, and placed in an autoclave at 150°C for 24 hours. The product was naturally cooled to room temperature and c...

Embodiment 2

[0023] The bamboo is processed into small pieces, cleaned to remove impurities, and then dried. Take about 2 g of small bamboo pieces and place them in a boat crucible, and carbonize in a tube furnace under a nitrogen atmosphere. The heating rate is 5℃ / min, and the carbonization temperature is 800℃, the carbonization time is 120 min. The carbonized product was mixed with potassium hydroxide solution, the ratio of alkali to carbon was 1:2, and it was immersed in a nickel crucible for 5 h at 90°C for high-temperature activation in a nitrogen atmosphere. The heating rate was 5°C / min and the activation temperature was At 800°C, the activation time is 120 minutes, and the activated product is washed to neutrality and dried to obtain bamboo-based porous carbon. The bamboo-based porous carbon was immersed in a potassium permanganate / manganese sulfate solution with a molar ratio of 1:3, and placed in an autoclave at 150°C for 24 hours. The product was naturally cooled to room temperatu...

Embodiment 3

[0026] The bamboo is processed into small pieces, cleaned to remove impurities, and then dried. Take about 2 g of small bamboo pieces and place them in a boat crucible, and carbonize in a tube furnace under a nitrogen atmosphere. The heating rate is 5℃ / min, and the carbonization temperature is 800℃, the carbonization time is 120 min. The carbonized product was mixed with potassium hydroxide solution, the ratio of alkali to carbon was 1:4, and it was immersed in a nickel crucible for 5 hours at 90℃ for high-temperature activation in a nitrogen atmosphere. The heating rate was 5℃ / min and the activation temperature was 700℃, activation time is 120min, and the activated product is washed to neutrality and dried to obtain bamboo-based porous carbon. The bamboo-based porous carbon was immersed in a potassium permanganate / manganese sulfate solution with a molar ratio of 1:3, and placed in an autoclave at 150°C for 24 hours. The product was naturally cooled to room temperature and cent...

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Abstract

The invention relates to a bamboo-based porous carbon / manganese dioxide nano composite electrode material for a supercapacitor and a preparation method thereof. The preparation method comprises the following steps: selecting moso bamboos as raw materials, processing the moso bamboos into small blocks, carrying out drying treatment, carrying out high-temperature carbonization on the small bamboo blocks in an inert atmosphere, dipping the carbonized product in an alkali metal hydroxide solution, carrying out high-temperature activation in the inert atmosphere, washing the activated product to beneutral, and drying to obtain bamboo-based porous carbon; potassium permanganate and manganese sulfate are used as raw materials, generating manganese dioxide nanospheres through adoption of a low-temperature hydrothermal method, loading the manganese dioxide nanospheres on the surface of the bamboo-based porous carbon, and obtaining the bamboo-based porous carbon / manganese dioxide nano compositematerial for the supercapacitor. The bamboo-based porous carbon / manganese dioxide nano composite electrode material for the supercapacitor and a preparation method thereof are simple to operate, lowin equipment requirement and wide in raw material source, and the bamboo is a renewable and biocompatible green material and has excellent electrochemical performance when used as a supercapacitor electrode material.

Description

Technical field [0001] The invention relates to a preparation method of a bamboo-based porous carbon / manganese dioxide nano composite material and its application in supercapacitors, and belongs to the technical field of supercapacitor electrode materials. Background technique [0002] With the aggravation of the global energy crisis and environmental pollution, the development and utilization of new clean energy has become one of the important issues facing people. The demand for portable energy storage devices with high energy density, excellent cycle performance, and safety and pollution-free is increasing. Among them, supercapacitors have become one of the most potential energy storage devices. Supercapacitors, also known as large-capacity capacitors or electrochemical capacitors, are a new type of energy storage device between batteries and ordinary power sources. They have ultra-high power, fast charging speed, long service life, superior low-temperature performance, and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/44H01G11/46
CPCH01G11/24H01G11/30H01G11/44H01G11/46Y02E60/13
Inventor 陈晓红李鑫刘杏娥马建峰尚莉莉
Owner BEIJING UNIV OF CHEM TECH
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