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High-nitrogen biochar composite material as well as preparation method and application thereof

A composite material, biochar technology, applied in nanotechnology for materials and surface science, chemical instruments and methods, carbon compounds, etc., can solve problems such as low energy density, reduce system reaction temperature and increase nitrogen content Effect

Active Publication Date: 2021-01-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, even the use of heteroatom-doped carbon electrodes still has the problem of low energy density in supercapacitor applications.

Method used

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  • High-nitrogen biochar composite material as well as preparation method and application thereof
  • High-nitrogen biochar composite material as well as preparation method and application thereof
  • High-nitrogen biochar composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Utilize high-nitrogen biochar composites to prepare supercapacitor electrodes, comprising the following steps:

[0045] Step 1: Weigh a certain quality of bean cake dregs raw material, mix with 2 M hydrochloric acid, heat to 60°C, carry out magnetic stirring and repeated pickling for 8 h, filter, then rinse with distilled water until the filtrate is neutral, and obtain solid phase washed bean cake dregs . After drying, take 5 g solid-phase washed bean cake dregs samples and place them in a tube furnace, and put 20% volume fraction CO 2 The gas was premixed with Ar gas as a carrier gas and passed into the tube furnace. After stabilization, the tube furnace was heated from room temperature to 800 °C for 2 h. After the sample was naturally cooled, it was taken out to prepare nitrogen self-doped active bean cake. Slag carbon, recorded as BPC-800-20%;

[0046] Step 2: Mix nitrogen self-doping active bean cake residue carbon BPC-800-20%, acetylene black and polytetrafluoroe...

Embodiment 2

[0050] A certain quality of bean cake dregs was weighed, mixed with 2 M hydrochloric acid, heated to 60°C for repeated pickling with magnetic stirring, filtered, and then rinsed with distilled water until the filtrate was neutral to obtain solid-phase washed bean cake dregs. Take 5g sample of solid-phase washed bean cake dregs and place it in a tube furnace, and put 100% volume fraction CO 2 The gas was used as the carrier gas and passed into the tube furnace. After stabilization, the tube furnace was heated from room temperature to 800 °C for 2 h. After the sample was naturally cooled, it was taken out to obtain activated bean cake residue carbon, which was designated as BPC-800;

[0051]Mix active bean cake residue carbon BPC-800, acetylene black and polytetrafluoroethylene at a mass ratio of 8:1:1, add an appropriate amount of isopropanol and grind to make an electrode film, and dry the electrode film in a vacuum oven at 80°C for 8 h, then cut a certain 1 cm × 1 cm diaphrag...

Embodiment 3

[0058] A certain quality of bean cake dregs was weighed, mixed with 2 M hydrochloric acid, heated to 60°C for repeated pickling with magnetic stirring, filtered, and then rinsed with distilled water until the filtrate was neutral to obtain solid-phase washed bean cake dregs. Weigh 0.025g of potassium carbonate and dissolve it in deionized water, add 5g of dried solid-phase washed bean cake dregs, and keep magnetic stirring at 70°C until the two are fully mixed. The mixture was placed in a tube furnace with 100% volume fraction of CO 2 The gas was used as carrier gas and passed into the tube furnace. After stabilization, the tube furnace was heated from room temperature to 700 °C for 0.5 h. After the sample was naturally cooled, it was taken out to prepare chain-type activated bean cake residue charcoal, and its specific surface area was measured. 678 m 2 / g, the nitrogen content is 5.2 wt.%.

[0059] From the above test results, it can be seen that in CO 2 A small amount of...

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Abstract

The invention provides a high-nitrogen biochar composite material as well as a preparation method and application thereof. The preparation method comprises the following steps of: taking high-nitrogenbiomass as a carbon source and a nitrogen source, and mixing, washing and modulating the high-nitrogen biomass and acid; putting the obtained solid product into pyrolysis equipment, introducing carbon-containing gas into the pyrolysis equipment to pyrolyze the solid product in a carbon-rich atmosphere, heating the equipment to a preset temperature from room temperature, treating for a period of time, and cooling to room temperature to realize one-step carbonization and activation of the high-nitrogen biomass, thereby obtaining nitrogen self-doped activated biochar; and carrying out metal oxide coating on the nitrogen self-doped active charcoal to obtain the high-nitrogen biochar composite material. One-step carbonization and activation of high-nitrogen biomass are realized by utilizing carbon-containing gas in a non-inert atmosphere, the energy density of a carbon electrode is improved by coating a transition metal oxide, in-situ nitrogen self-doping and functionalization of a biocharstructure are realized, and the high-nitrogen biochar composite material can be used for preparing an electrode of a supercapacitor or an ion battery.

Description

technical field [0001] The invention relates to the technical field of high-value utilization of organic solid waste, in particular to a functional type of transition metal oxide coating with multi-level channels prepared by utilizing high-nitrogen-containing biomass in a carbon-rich atmosphere and a liquid phase system Biochar composite materials, and then applied in energy storage fields such as supercapacitors. Background technique [0002] Biomass is the only CO 2 A renewable resource with net zero emissions. Biomass can be converted into gas, liquid and solid three-state products through pyrolysis, which is a simple high-value utilization technology of biomass. There are many kinds of biomass, one of which has a high nitrogen content, such as bean cake residue, bean curd residue, shrimp shell, crab shell, algae, etc. Take bean cake dregs as an example. Bean cake dregs is a by-product obtained by extracting soybean oil from soybeans. It is a raw material with high cru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/336C01B32/348C01B32/372C01B32/324C01G45/02B82Y40/00B82Y30/00H01G11/24H01G11/26H01G11/34H01G11/44H01M4/583
CPCC01B32/336C01B32/348C01B32/372C01B32/324C01G45/02B82Y40/00B82Y30/00H01G11/24H01G11/26H01G11/34H01G11/44H01M4/583C01P2004/80Y02E60/13Y02E60/10
Inventor 王树荣李允超丁岩朱玲君邱坤赞周劲松
Owner ZHEJIANG UNIV
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