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Thick-layer three-dimensional vertical graded multi-channel graphitized active wood source carbon electrode and preparation method thereof

A carbon electrode and porous channel technology, which is applied in the field of thick-layer three-dimensional vertical hierarchical porous channel graphitized active wood-source carbon electrode and its preparation field, can solve the problems of high degree of non-graphitization, damage to base structure, poor rate performance, etc. Achieve the effect of graphitization degree and specific surface area improvement, specific surface area improvement and pore structure rationalization

Inactive Publication Date: 2020-07-10
SHAANXI TECHN INST OF DEFENSE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thick-layer wood-derived carbon still has obvious disadvantages: 1) The pore size distribution is single, mainly micropores, and the capacitance performance is poor
Because traditional biomass carbons are mainly prepared based on direct pyrolysis and activation, but the resulting carbon materials are mainly composed of micropores, which are unfavorable for the migration of ions.
For wood-derived carbon, there is no other form of pore structure except for a few original super-large pores (pores on the tube wall) on the tube wall between the channels, resulting in low specific capacitance and poor rate performance of the electrode material.
2) High degree of non-graphitization and poor conductivity
Wood-derived carbon is a hard carbon material (i.e., non-graphitizable carbon) consisting of disordered arrangements of graphite microcrystals, which are very small and disordered in size, limiting the specific surface area and electrical conductivity of wood-derived carbon. low, which hinders its application
3) It is difficult to achieve effective treatment inside the channel
Up to now, the preparation method of graphitized biomass activated carbon (GBAC) materials mainly adopts a two-step method, that is, the above-mentioned activation and graphitization processes are completed step by step. The multi-step process is not only very time-consuming, but also causes damage to the substrate structure. severe damage, limiting its further application

Method used

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  • Thick-layer three-dimensional vertical graded multi-channel graphitized active wood source carbon electrode and preparation method thereof
  • Thick-layer three-dimensional vertical graded multi-channel graphitized active wood source carbon electrode and preparation method thereof
  • Thick-layer three-dimensional vertical graded multi-channel graphitized active wood source carbon electrode and preparation method thereof

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Embodiment 1

[0036] 1. Preparation of thick-layer wood-derived carbon electrodes

[0037]Clean the wood with a size of 0.8cm×0.8cm×2.0cm with ethanol and deionized water, dry it, raise the temperature to 900℃ at 5℃ / min in a nitrogen atmosphere, carbonize at a constant temperature for 3 hours, and then cool down to room temperature naturally. Ultrasonic cleaning with ethanol and deionized water and drying in an oven at 100 °C for 1 hour yielded a thick-layer wood-derived carbon electrode (TWC).

[0038] 2. Vacuum-assisted modification

[0039] Place the TWC obtained in step 1 in 50mL mixed acid solution, the mixed acid solution is composed of nitric acid, sulfuric acid and deionized water, wherein the mass fraction of nitric acid is 10%, the mass fraction of sulfuric acid is 50%, in a vacuum environment at 60°C After soaking for 30 minutes, the product was sequentially washed with ethanol and deionized water until the pH was neutral, and then dried in an oven at 100°C for 1 hour to obtain ...

Embodiment 2

[0047] 1. Preparation of thick-layer wood-derived carbon electrodes

[0048] This step is the same as in Example 1.

[0049] 2. Vacuum-assisted modification

[0050] Place the TWC obtained in step 1 in 50mL mixed acid solution, the mixed acid solution is composed of nitric acid, sulfuric acid and deionized water, wherein the mass fraction of nitric acid is 5%, the mass fraction of sulfuric acid is 25%, in a vacuum environment at 60°C After soaking for 10 minutes, the product was sequentially washed with ethanol and deionized water until the pH was neutral, and dried in an oven at 100°C for 1 hour to obtain the modified TWC.

[0051] 3. Impregnated catalytic activator

[0052] The modified TWC obtained in step 2 was impregnated in 50mL 0.05mol / L Fe(NO 3 ) 3 In aqueous solution, reflux at 80°C for 6 hours to obtain impregnated Fe(NO 3 ) 3 Modified TWC.

[0053] 4. One-step preparation of thick-layer three-dimensional vertically hierarchical porous graphitized active wood-...

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Abstract

The invention discloses a preparation method of a thick-layer three-dimensional vertical graded multi-channel graphitized active wood source carbon electrode, which belongs to the technical field of supercapacitors. According to the method, the thick-layer three-dimensional vertical graded multi-channel graphitized active wood source carbon electrode is prepared for the first time through a simplevacuum assisted catalysis method, and the effect of uniformly and vertically punching holes in the graded multi-channel pipe wall of the thick-layer wood source carbon material is achieved for the first time. Meanwhile, the graphitization and activation synergistic treatment on the wood source carbon electrode is completed. According to the method, a catalyst solution is uniformly attached to theinner wall of a wood source carbon pore channel; the influence of pipeline internal pressure in a wood pipeline on substrate pretreatment and activated graphite effect is effectively overcome, and the graphitization degree of the electrode material is improved on the premise of improving the pore structure and specific surface area of the wood source carbon electrode material, so that the electrode material becomes a thick-layer electric double-layer electrode material with excellent electrochemical performance. The method is short in production period and easy to control, and macro preparation of hole wall punching and graphitization of the thick-layer carbon material of the deep hole channel can be achieved.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a thick-layer three-dimensional vertical hierarchical multi-channel graphitized active wood-source carbon electrode and a preparation method thereof. Background technique [0002] Thick wood source carbon (TWC) is a bulk carbon material prepared from wood. Wood is the most important lignocellulosic biomass material on earth, containing a large amount of lignin and cellulose, as an easy-to-develop and inexpensive renewable material, TWC due to its unique, natural, self-supporting porous structure, It is widely used in renewable energy and materials. Among them, the application of renewable energy mainly includes the conversion of processing residues into high value-added products or the direct preparation of supercapacitors, such as high-performance porous carbon for supercapacitors, which has potential application value in energy storage and is important for ...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01G11/86H01G11/30H01G11/24
CPCC01B32/05H01G11/24H01G11/30H01G11/86Y02E60/13
Inventor 刘沛静辛福恩
Owner SHAANXI TECHN INST OF DEFENSE IND
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