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Porous carbon/Ni(OH)2 composite electrode material and preparation method thereof

A composite electrode and porous carbon technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of non-environmentally friendly electrode material sources, expensive and unfavorable prices, and low specific capacitance, so as to improve electrochemical performance , good reversibility, high specific capacitance effect

Inactive Publication Date: 2021-06-04
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of low specific capacitance, poor reversibility and poor conductivity, non-environmental protection of carbon-based electrode materials in the above-mentioned prior art, as well as the limited source of electrode materials using green biomass carbon materials as raw materials, the high price is not conducive to industrial production, so Preparation of Ginkgo biloba-derived porous biochar / Ni(OH) 2 Composite electrode materials have the characteristics of economical and environmentally friendly preparation process, good conductivity and high specific capacitance.

Method used

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  • Porous carbon/Ni(OH)2 composite electrode material and preparation method thereof
  • Porous carbon/Ni(OH)2 composite electrode material and preparation method thereof
  • Porous carbon/Ni(OH)2 composite electrode material and preparation method thereof

Examples

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Embodiment 1

[0044] 1. Rinse the ginkgo leaves with distilled water, dry them in an oven at 90°C, and pulverize them to obtain ginkgo leaf powder with a particle size of 1.0mm;

[0045] 2. Weigh 5g of ginkgo powder and dissolve it in 55ml of deionized water, stir and add 10ml of acetic acid to form a viscous solution, put it in an autoclave, react at 200°C for 2h, the heating rate is 5°C / min, cool down naturally, and vacuum pump The brown-black substance was obtained by filtration, washed with deionized water until neutral, and dried overnight at 105°C;

[0046] 3. Mix the dried substance with urea and KOH at a mass ratio of 1:1:1.5, grind until uniform, move to a tube furnace, set the heating rate at 5°C / min, from room temperature to 800°C, heat treatment 2h, natural cooling, the whole process is protected by argon atmosphere, and a black product is obtained;

[0047] 4. Wash the black product with 1M HCl until no bubbles are generated, then wash with distilled water until neutral, and d...

Embodiment 2

[0062] 1. Rinse the ginkgo leaves with distilled water, dry them in an oven at 80°C, and pulverize them to obtain ginkgo leaf powder with a particle size of 0.15 mm;

[0063] 2. Weigh 5g of ginkgo powder and dissolve it in 55ml of deionized water, stir and add 10ml of acetic acid to form a viscous solution, put it in an autoclave, react at 200°C for 2h, the heating rate is 5°C / min, cool down naturally, and vacuum pump The brown-black substance was obtained by filtration, washed with deionized water until neutral, and dried overnight at 105°C;

[0064] 3. Mix the dried substance with urea and KOH at a mass ratio of 1:1:1.5, grind until uniform, move to a tube furnace, set the heating rate at 5°C / min, from room temperature to 800°C, heat treatment 2h, natural cooling, the whole process is protected by argon atmosphere, and a black product is obtained;

[0065] 4. Wash the black product with 1M HCl until no bubbles are generated, then wash with distilled water until neutral, and...

Embodiment 3

[0072] 1. Rinse the ginkgo leaves with distilled water, dry them in an oven at 100°C, and pulverize them to obtain ginkgo leaf powder with a particle size of 0.15mm;

[0073] 2. Weigh 5g of ginkgo powder and dissolve it in 55ml of deionized water, stir and add 10ml of acetic acid to form a viscous solution, put it in an autoclave, react at 200°C for 2h, the heating rate is 5°C / min, cool down naturally, and vacuum pump The brown-black substance was obtained by filtration, washed with deionized water until neutral, and dried overnight at 105°C;

[0074]3. Mix the dried substance with urea and KOH at a mass ratio of 1:1:1.5, grind until uniform, move to a tube furnace, set the heating rate at 5°C / min, from room temperature to 800°C, heat treatment 2h, natural cooling, the whole process is protected by argon atmosphere, and a black product is obtained;

[0075] 4. Wash the black product with 1M HCl until no bubbles are generated, then wash with distilled water until neutral, and ...

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Abstract

The invention discloses a porous carbon / Ni(OH)2 composite electrode material and a preparation method thereof. The method comprises the following steps: by taking ginkgo leaves as a raw material, preparing ginkgo leaf powder from the ginkgo leaves, then adding an impurity removal agent acetic acid, an activating agent potassium hydroxide and urea, fully mixing, drying and dehydrating to obtain a carbon precursor, and carrying out high-temperature carbonization and activation treatment on the dried carbon precursor to prepare biomass charcoal with rich pore structures and high graphitization degree, wherein polymers such as cellulose in the ginkgo leaf powder are carbonized to form a carbon skeleton; washing with a large amount of distilled water to remove residual potassium hydroxide, urea and other components, and carrying out vacuum drying to obtain the biomass charcoal material; and taking nickel nitrate as a nickel source, and providing an alkaline environment by KOH to react to generate the porous carbon / Ni(OH)2 composite electrode material. The prepared asymmetric water system supercapacitor has the advantages of high specific capacitance and good reversibility and conductivity.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a porous carbon / Ni(OH) 2 Composite electrode material and its preparation method. Background technique [0002] In recent years, supercapacitors have attracted the attention of researchers due to their advantages such as high power density, long cycle life, wide operating temperature range, safety and reliability, and set off an upsurge in the study of supercapacitor electrode materials. At present, carbon materials and metal oxides / sulfides are widely used as supercapacitor materials, and their electrochemical properties are mainly determined by factors such as pore structure, conductivity, and surface state. Among them, because biomass materials are rich in a large amount of carbon elements and are renewable and non-polluting, they have great application prospects in the preparation of carbon materials, so the use of biomass raw materials to prepare supercapacitor elec...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/34H01G11/44H01G11/24H01G11/86
CPCH01G11/30H01G11/34H01G11/44H01G11/24H01G11/86Y02E60/13
Inventor 樊新周芳莹李良烁陈柳婷黎灿灿黎思思秦琳邓酩
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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