Thick-layer three-dimensional vertical hierarchical multi-channel graphitized activated wood-source carbon electrode and its preparation method

A technology of carbon electrode and multi-channel, which is applied in the field of graphitized active wood source carbon electrode and its preparation in thick layer three-dimensional vertical hierarchical multi-channel, which can solve the problems of high degree of non-graphitization, low specific capacitance and poor conductivity of electrode materials , to achieve the effect of increasing the degree of graphitization and specific surface area, increasing the specific surface area, and improving the capacitance performance

Inactive Publication Date: 2021-06-04
SHAANXI TECHN INST OF DEFENSE IND
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  • 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 hierarchical multi-channel graphitized activated wood-source carbon electrode and its preparation method
  • Thick-layer three-dimensional vertical hierarchical multi-channel graphitized activated wood-source carbon electrode and its preparation method
  • Thick-layer three-dimensional vertical hierarchical multi-channel graphitized activated wood-source carbon electrode and its preparation method

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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 hierarchical multi-channel graphitized active wood-source carbon electrode, which belongs to the technical field of supercapacitors. The present invention prepares a thick-layer three-dimensional vertically graded multi-channel graphitized active wood-source carbon electrode for the first time through a simple vacuum-assisted catalytic method, and for the first time realizes uniform vertical perforation on the wall of a thick-layer wood-source carbon material graded multi-channel pipe wall Effect. At the same time, the synergistic treatment of graphitization and activation of wood-sourced carbon electrodes is completed. This method makes the catalyst solution evenly adhere to the inner wall of the wood source carbon channel, effectively overcomes the influence of the internal pressure of the pipe in the wood pipeline on the effect of substrate pretreatment and activated graphitization, and improves the pore structure and specific surface area of ​​the wood source carbon electrode material. Next, the degree of graphitization of the electrode material can be improved, so that it can become a thick layer electric double layer electrode material with excellent electrochemical performance. The method has a short production cycle and is easy to control, and can realize the macro-preparation of deep-channel thick-layer carbon material pore wall drilling and graphitization.

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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Patent Type & Authority Patents(China)
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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