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Biomass activated carbon, preparation method and application thereof, and electrode

A technology of activated carbon and biomass, applied in chemical instruments and methods, hybrid capacitor electrodes, carbon compounds, etc., to achieve the effect of excellent rate performance, taking into account cost and environmental protection requirements, and long life

Pending Publication Date: 2021-01-08
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the defect that the existing biomass activated carbon has high specific surface area and high and medium pore ratio at the same time, and its application in supercapacitors is limited, the present invention provides a preparation method of biomass activated carbon. Biomass activated carbon has high specific surface area and high and medium pore ratio at the same time. When the electrode prepared with it is used in supercapacitor, it has large specific volume and high capacitance retention rate.

Method used

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  • Biomass activated carbon, preparation method and application thereof, and electrode
  • Biomass activated carbon, preparation method and application thereof, and electrode
  • Biomass activated carbon, preparation method and application thereof, and electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Preparation of coconut shell activated carbon:

[0062] (1) Crush coconut shell charcoal to a particle size of 14 μm, mix it with KOH powder at a mass ratio of 2:1 for 0.5 h, add it to the rotary furnace; heat up to 850 °C at a rate of 3 °C / min, and activate for 1 h (the first time Insulation), to obtain precursor A;

[0063] (2) At 850°C, within 1 hour, water vapor with a mass ratio of 1:1 to coconut shell carbon was introduced at a constant speed (second activation) to obtain precursor B;

[0064] (3) Precursor B was dispersed into hydrochloric acid with a mass fraction of 3% and a temperature of 80°C and then filtered for 1 h (the first pickling); washed with hot water at a temperature of 60°C and filtered (the first water wash ); with the mass fraction being respectively the mixed acid washing of 1% hydrochloric acid and 1% nitric acid and filtering (the second pickling); washing with hot water with a temperature of 50°C until the filtrate is neutral (the second wa...

Embodiment 2

[0067] Preparation of coconut shell activated carbon: Except that in step (2), the water vapor with the coconut shell carbon mass ratio of 2:1 is passed at a constant speed within 2h, other steps and conditions are consistent with Example 1.

Embodiment 3

[0069] Preparation of coconut shell activated carbon: except that coconut shell carbon and KOH powder are mixed according to the mass ratio of 1:1 in step (1), other steps and conditions are consistent with Example 1.

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Abstract

The invention discloses biomass activated carbon, a preparation method and application thereof, and an electrode. The preparation method of the biomass activated carbon comprises the following steps:(1) carrying out primary activation on a mixture of biochar and an alkali at 500-900 DEG C to obtain a precursor A; (2) carrying out secondary activation on the precursor A in an oxidizing gas atmosphere at 500-900 DEG C to obtain a precursor B; (3) washing the precursor B to be neutral, and then drying to obtain a precursor C; and (4) carbonizing the precursor C to obtain the biomass activated carbon. According to the invention, the biomass activated carbon prepared by the preparation method has high specific surface area and high mesopore ratio at the same time; and when an electrode prepared from the biomass activated carbon is used for a supercapacitor, the specific volume is large, and the capacitance retention rate is high.

Description

technical field [0001] The invention relates to a biomass activated carbon, an electrode and a preparation method and application thereof. Background technique [0002] Supercapacitor is a new type of energy storage medium between batteries and traditional capacitors. According to the storage and conversion mechanism of electric energy, it can be divided into electric double layer capacitance and pseudocapacitance. Double-layer capacitors currently mainly use porous activated carbon particles with high specific surface area as electrode materials. From the pore size of activated carbon, activated carbon is divided into micropores, mesopores and macropores. It is generally believed that micropores are pores of <2nm, mesopores (mesoporous) are pores of 2-50nm, and macropores are pores of >50nm. Micropores can provide a large specific surface area for use in supercapacitors to provide a large specific capacitance, but the pores are small, resulting in low kinetic perfor...

Claims

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Application Information

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IPC IPC(8): C01B32/348C01B32/336C01B32/30H01G11/34H01G11/26
CPCC01B32/348C01B32/336C01B32/30H01G11/34H01G11/26Y02E60/13
Inventor 潘福森刘冬冬沈龙吴志红丁晓阳
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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