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A kind of porous biochar/co(oh) 2 Composite electrode material and preparation method thereof

A composite electrode and biomass carbon technology, which is used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve the problems of unfriendly electrode material sources, low specific capacitance of electrode materials, and high price, etc., and achieves easy control. and large-scale, high specific capacitance, good reversibility and conductivity

Active Publication Date: 2022-06-28
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide and a kind of porous biomass charcoal / Co(OH) 2 Composite electrode material and preparation method thereof, to solve the problem of low specific capacitance, poor reversibility and poor conductivity, non-environmental protection, and limited sources of electrode materials using green biomass carbon materials as raw materials, expensive prices and unfavorable industrialization in the above-mentioned prior art production problem

Method used

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  • A kind of porous biochar/co(oh) <sub>2</sub> Composite electrode material and preparation method thereof
  • A kind of porous biochar/co(oh) <sub>2</sub> Composite electrode material and preparation method thereof
  • A kind of porous biochar/co(oh) <sub>2</sub> Composite electrode material and preparation method thereof

Examples

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Embodiment 1

[0045] 1) Porous Biochar / Co(OH) 2 Preparation of composite electrode materials

[0046] (1) Wash the collected food residue potato skins with distilled water and ethanol for 3 times respectively, and place them in an oven at 80°C to dry for later use;

[0047] (2) pulverizing the dried potato skin to a particle diameter of 1.0 mm, crosses a 200-mesh sieve to obtain potato skin powder;

[0048] (3) Mix potato peel powder, potassium hydroxide and urea according to a mass ratio of 1:1.5:1, add distilled water and stir for 8h after mixing evenly to form a viscous solution, and then dry at 105°C to obtain a mixture;

[0049] (4) Transfer the above mixture to a tube furnace, heat treatment at 800°C for 2h under an argon atmosphere, with a heating rate of 5°C / min, and naturally cool to room temperature to obtain a black product;

[0050] (5) washing the black product with 2M HCl until neutral, then washing with distilled water 3 times, and vacuum drying at 105°C to obtain porous bi...

Embodiment 2

[0069] 1) Porous Biochar / Co(OH) 2 Preparation of composite electrode materials

[0070] (1) Wash the collected food residue potato skins with distilled water and ethanol for 5 times respectively, and put them into an oven for drying at 80°C for later use;

[0071] (2) pulverizing the dried potato skins to a particle size of 0.15mm, cross a 200-mesh sieve to obtain potato skin powder;

[0072] (3) Mix potato peel powder, potassium hydroxide and urea according to a mass ratio of 1:1.5:1, add distilled water and stir for 8h after mixing evenly to form a viscous solution, and then dry at 105°C to obtain a mixture;

[0073] (4) Transfer the above mixture to a tube furnace, heat treatment at 800°C for 2h under an argon atmosphere, with a heating rate of 5°C / min, and naturally cool to room temperature to obtain a black product;

[0074] (5) washing the black product with 2M HCl until neutral, then washing with distilled water 3 times, and vacuum drying at 105°C to obtain porous bio...

Embodiment 3

[0082] 1) Porous Biochar / Co(OH) 2 Preparation of composite electrode materials

[0083] (1) Wash the collected food residue potato peels with distilled water and ethanol for 8 times respectively, and put them into an oven for drying at 80°C for later use;

[0084] (2) pulverizing the dried potato skin to a particle size of 2.0 mm, crosses a 200-mesh sieve to obtain potato skin powder;

[0085] (3) Mix potato peel powder, potassium hydroxide and urea according to a mass ratio of 1:1.5:1, add distilled water and stir for 8h after mixing evenly to form a viscous solution, and then dry at 105°C to obtain a mixture;

[0086] (4) Transfer the above mixture to a tube furnace, heat treatment at 800°C for 2h under an argon atmosphere, the heating rate is 5°C / min, and naturally cool to room temperature to obtain a black product;

[0087] (5) Wash the black product with 2M HCl to neutrality, then wash with distilled water for 5 times, and vacuum dry at 105° C. to obtain porous biomass ...

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Abstract

The invention discloses a porous biomass charcoal / Co(OH) 2 Composite electrode material and its preparation method. The porous biochar / Co(OH) 2 The composite electrode material is made of food residue potato skins, mixed with activator potassium hydroxide and urea, dehydrated and carbonized to prepare porous biochar material, and then cobalt nitrate is used as cobalt source and potassium hydroxide to provide alkaline conditions here Surface growth of porous biochar materials to obtain porous biochar / Co(OH) 2 Composite electrode material. The porous structure material has a large specific surface area, which is beneficial to the wetting of the electrolyte and the transport and migration of carriers in the electrode material, thereby improving the electrochemical performance of the carbon material. The electrode material as a working electrode exhibits high specific capacitance, excellent rate characteristics and good cycle stability, and the preparation process is green and easy to operate. This method can also be used to synthesize porous carbon derived from other biomass materials electrode material.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a porous biomass carbon / Co(OH) 2 Composite electrode material and preparation method thereof. Background technique [0002] With the contradiction between the demand for energy in the rapid development of the new economy and the increasingly aggravating problem of environmental pollution, a new type of energy storage device is urgently needed. Supercapacitors are known as electrochemical double-layer capacitors and are characterized by high power density, fast charge and discharge rates, and excellent cycling stability. Furthermore, supercapacitors have been proposed as future alternative energy storage devices due to their high power performance and low maintenance costs. Supercapacitors not only charge faster, they are also more reliable because they are less susceptible to temperature changes. Therefore, supercapacitors have attracted great attention from the scient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/34H01G11/44H01G11/24H01G11/86
CPCH01G11/30H01G11/34H01G11/44H01G11/24H01G11/86
Inventor 樊新苏筱峥李良烁宁方慧秦琳邓酩
Owner GUILIN UNIVERSITY OF TECHNOLOGY