Self-doped nitrogen biomass porous carbon as well as preparation method and application thereof

A biomass and self-doping technology, applied in the field of electrochemistry, can solve problems such as poor electrochemical performance, and achieve good lithium ion affinity, excellent electrochemical performance, and simple process

Active Publication Date: 2021-10-22
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nitrogen-doped porous carbon in the prior art has the problem of poor electrochemical performance

Method used

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  • Self-doped nitrogen biomass porous carbon as well as preparation method and application thereof
  • Self-doped nitrogen biomass porous carbon as well as preparation method and application thereof
  • Self-doped nitrogen biomass porous carbon as well as preparation method and application thereof

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preparation example Construction

[0032] The invention provides a method for preparing self-doped nitrogen biomass porous carbon, comprising the following steps:

[0033] Drying the blood sample to obtain a solid sample;

[0034] Pre-carbonizing the solid sample after being mixed with an inorganic base to obtain a pre-carbon product;

[0035] Carbonizing the pre-carbonized product to obtain a carbonized product;

[0036] Pickling the carbonized product to obtain the self-doped nitrogen biomass porous carbon;

[0037] A flux is added during the pre-carbonization or carbonization.

[0038] In the invention, the blood sample is dried to obtain a solid sample.

[0039] In the present invention, the blood sample is preferably animal blood or blood tofu derived from animal blood, and the animal blood is more preferably pig blood, cow blood, sheep blood, chicken blood or duck blood. In the present invention, there is no special limitation on the source of the blood sample, and a source well known to those skilled...

Embodiment 1

[0067] (1) Take 500mL of fresh pig blood in a 1L beaker, heat and dry in a drying oven at 80°C until constant weight.

[0068] (2) The dried fresh pig blood was pulverized, passed through a 200-mesh sieve, and 1.00 g of the under-sieved powder was mixed with KOH and NaCl in a mass ratio of 4:1:1, and placed in a corundum ark.

[0069] (3) Place the corundum ark in a tube furnace for pre-carbonization in a nitrogen atmosphere, and raise the temperature to 400°C at a heating rate of 10°C / min, and the pre-carbonization time is 1h.

[0070] (4) After the pre-carbonization is completed, the temperature is raised to 950°C at a heating rate of 10°C / min, and carbonized for 2 hours. ), washed with distilled water until neutral and then dried to obtain self-doped nitrogen biomass porous carbon.

[0071] The scanning electron microscope image of the self-doped nitrogen biomass porous carbon material prepared in this example is as follows figure 1 It can be seen from the figure that the...

Embodiment 2

[0073] (1) Take 2000mL of fresh pig blood in a 1L beaker, heat and dry in a drying oven at 80°C until constant weight.

[0074] (2) The dried fresh pig blood was pulverized, passed through a 200-mesh sieve, and 3.00 g of the under-sieved powder was mixed with KOH at a mass ratio of 3:1 and placed in a corundum ark.

[0075] (3) Place the corundum ark in a tube furnace for pre-carbonization in a nitrogen atmosphere, and raise the temperature to 450°C at a heating rate of 5°C / min for a pre-carbonization time of 1.5h.

[0076] (4) After the pre-carbonization is completed, take 1.0g NaCl, mix it with the pre-carbonized product evenly, heat up to 900°C at a heating rate of 5°C / min, carbonize for 2 hours, pulverize the carbonized material and wash it with 6mol / L hydrochloric acid solution (the amount ratio of carbonization product to hydrochloric acid solution is 1g:20mL), washed with distilled water until neutral and then dried to obtain self-doped nitrogen biomass porous carbon. ...

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Abstract

The invention provides self-doped nitrogen biomass porous carbon as well as a preparation method and application thereof, and belongs to the technical field of electrochemistry. According to the invention, blood is used as a raw material, under the action of an inorganic base pore forming and a fluxing agent, a two-step carbonization process is carried out, and the self-doped nitrogen biomass porous carbon material is obtained after acid pickling. The self-doped nitrogen biomass porous carbon obtained by the invention can effectively accelerate the electron transfer speed, and the higher specific surface area is beneficial to the transmission and storage of lithium ions. The lithium ion capacitor prepared from a biomass porous carbon negative electrode material obtained by the preparation method is excellent in electrochemical performance and long in cycle life. The raw materials are low in price, easy to obtain, green, environmentally friendly and renewable, the requirement for equipment in the preparation process is low, the preparation method is simple and economical, operation is convenient, large-scale production is easy, and huge potential application value is achieved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a self-doping nitrogen biomass porous carbon and its preparation method and application. Background technique [0002] With the rapid development of the global economy and the increasing demand for energy, the substantial increase in the consumption of fossil fuels has brought about serious environmental problems. First, the large-scale exploitation of fossil fuels has caused environmental damage and pollution; The problem of environmental pollution and the greenhouse effect caused by a large amount of greenhouse gas emissions affecting the global environment. Therefore, it is imperative to develop and promote sustainable clean energy and related technologies. However, limited by various conditions such as geography, seasons, and weather, most renewable clean energy is difficult to be continuously utilized. Therefore, it is imminent to find an efficient, low-cost, and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/26H01G11/50H01G11/86
CPCC01B32/05H01G11/50H01G11/26H01G11/86Y02E60/13
Inventor 武建飞陈国栋孙晓林
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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