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Method for preparing cellulose-based porous carbon material by using hydrothermal-activation-pyrolysis method and application thereof to supercapacitor electrode

A cellulose and pyrolysis technology, used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of low conductivity and poor cycle stability, and achieve stable cycle performance, large specific capacity, low The effect of preparation cost

Inactive Publication Date: 2017-12-01
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy storage principle of pseudocapacitive capacitors is the occurrence of Faradaic reactions on the electrode surface, which is limited in practical applications due to their low conductivity and poor cycle stability.

Method used

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  • Method for preparing cellulose-based porous carbon material by using hydrothermal-activation-pyrolysis method and application thereof to supercapacitor electrode
  • Method for preparing cellulose-based porous carbon material by using hydrothermal-activation-pyrolysis method and application thereof to supercapacitor electrode
  • Method for preparing cellulose-based porous carbon material by using hydrothermal-activation-pyrolysis method and application thereof to supercapacitor electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The bast part of the hemp stem is washed with de-ethanol and deionized water in sequence, and then dried to obtain the hemp fiber precursor. Weigh 1g of the hemp fiber precursor and add it to 50ml, 3M KOH solution, conduct a hydrothermal reaction at 150°C for 6 hours in the reactor, take it out after natural cooling, and fully wash it with deionized water until the washing liquid is neutral , and use ultrasound to make the fibers more dispersed, and then dry at 60°C to obtain a precursor based on hemp cellulose. Get 0.5g of hydroheated hemp cellulose precursor and 1g of KOH and add it to 50ml deionized water, let it stand for 48h and then dry it in a vacuum oven to obtain hemp cellulose-KOH composite precursor. At this time, hemp cellulose and The mass ratio of KOH is 1:2. Put the dried composite precursor into a tube furnace and heat at 3 °C min under a nitrogen atmosphere. -1 The temperature was raised to 900°C at a high speed, and kept at this temperature for 1 hou...

Embodiment 2

[0023] The method of this example is basically the same as that of Example 1, except that the obtained hemp cellulose-KOH composite precursor is heated to 800°C in a tube furnace to obtain a hemp-based carbon material named Hemp-800. figure 1 It is a scanning electron microscope image of the hemp-based carbon material Hemp-800. It can be seen from the figure that the carbon material has a three-dimensional open multi-level pore structure, which ensures good transport capacity of anions and cations in the electrolyte.

Embodiment 3

[0025] The method of this example is basically the same as that of Example 1, except that the obtained hemp cellulose-KOH composite precursor is heated to 700°C in a tube furnace to obtain a hemp-based carbon material named Hemp-700.

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Abstract

The invention provides a method for preparing a supercapacitor electrode material by a cellulose-rich plant material. The method comprises the steps peeling a dried hemp stem or reed stem in an alkaline or acidic environment after hydrothermal treatment to obtain a cellulose-dominant precursor; then mixing and drying the hydrothermal precursor and an activator with a certain concentration to obtain a mixed precursor; and then calcining the mixed precursor at a certain temperature, being sequentially subjected to acid pickling and deionized water washing and then drying to obtain a porous carbon material. The method takes the hemp stem or reed stem as a raw material. The acquired electrode material has the characteristics of three-dimensional open structure, high surface and multi-level pore structure, and has the advantages of abundant sources, low cost and simple preparation process. The prepared porous carbon material show excellent capacitive performance when acting as an electrode material of a supercapacitor.

Description

technical field [0001] The invention belongs to the field of chemical energy materials, and provides a method for preparing a cellulose-based porous carbon material by a hydrothermal-activation-pyrolysis method, and its application as a supercapacitor electrode in an ionic liquid-based electrolyte system. Background technique [0002] Due to the scarcity of fossil fuels and the increasingly serious environmental problems, there is an urgent need to develop clean, renewable and easy-to-storage energy. Supercapacitors have become one of the most potential energy storage devices due to their advantages such as high power density, long cycle life, fast charge-discharge rate, and environmental friendliness. According to the energy storage mechanism, supercapacitors can be divided into two types: electric double layer capacitors and pseudocapacitors. The energy storage principle of pseudocapacitive capacitors is the occurrence of Faradaic reactions on the electrode surface, but t...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/26H01G11/40
CPCY02E60/13H01G11/86H01G11/26H01G11/40
Inventor 王焕磊毛楠周冬
Owner OCEAN UNIV OF CHINA