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Defect-rich carbon material as well as preparation method and application thereof

A carbon material and defect-rich technology, applied in the preparation/purification of carbon, electrical components, battery electrodes, etc., can solve the problems of cumbersome design and synthesis steps, low catalytic activity, etc., achieve improved catalytic activity, strong operational flexibility, The effect of easy operation

Pending Publication Date: 2021-11-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a defect-rich carbon material and its preparation method and application, which are used to solve the technical problems of low catalytic activity of existing carbon materials and cumbersome design and synthesis steps

Method used

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  • Defect-rich carbon material as well as preparation method and application thereof
  • Defect-rich carbon material as well as preparation method and application thereof
  • Defect-rich carbon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation method of the defect-rich carbon material in this example, in this example, the metal-organic framework complex of zinc-benzimidazole (Zn-BZIM) is used as the carbon precursor material, and the Zn-BZIM-derived carbon material is improved by using an oxidation etching strategy defect sites to improve its electrocatalytic performance, the specific preparation method is as follows:

[0041] (1) Preparation of carbon precursor material: Dissolve 10mmol of zinc nitrate in 100mL of methanol solution, and another 20mmol of benzimidazole in 100mL of methanol solution. After complete dissolution, mix the two solutions and stir at room temperature for 12h. After standing at room temperature for 2 h, a white complex precipitate was obtained. The suspension was vacuum filtered, washed three times with alcohol solution, and then dried at 60° C. for 12 hours to obtain a white metal-organic framework complex of zinc-benzimidazole (Zn-BZIM);

[0042] (2) Get 300mg of Z...

Embodiment 2

[0049] The preparation method of the defect-rich carbon material in this example, this example uses the zinc-2-methylimidazole (ZIF-8) metal-organic framework complex as the carbon precursor material, and uses the oxidation etching strategy to improve the ZIF-8 derived carbon The defect sites of the material are used to improve its electrocatalytic performance. The specific preparation method is as follows:

[0050] (1) Preparation of carbon precursor material: Dissolve 20mmol of zinc nitrate in 100mL of methanol solution, and 80mmol of 2-methylimidazole in 100mL of methanol solution. After complete dissolution, mix the two solutions and stir at room temperature After 12 hours, it was allowed to stand at room temperature for 24 hours, and a white complex precipitate was obtained. The solution was centrifuged three times at a speed of 8000r / min, washed three times with methanol solution, and then dried at 60° C. for 12 hours to obtain a white metal-organic framework complex of ...

Embodiment 3

[0058] The preparation method of the defect-rich carbon material in this embodiment, polypyrrole is used as the carbon precursor material in this embodiment, and the specific preparation method is as follows:

[0059] (1) Preparation of carbon precursor material: 40 mmol of pyrrole monomer was dissolved in 300 mL of alcohol / water mixture (ethanol: water = 1:1), and another 40 mmol of persulfuric acid was dissolved in 25 mL of water. The ammonium persulfate solution was slowly added dropwise to the pyrrole solution, and stirred for 12 h in an ice-bath environment to obtain a dark green suspension solution. The obtained suspension was filtered, washed, and dried to obtain a dark green powder, namely polypyrrole Ppy.

[0060] (2) Take 300mg of Ppy obtained in a large porcelain boat, and another 150mg of sodium nitrate (NaNO 3 ) in a small porcelain boat, place the small porcelain boat containing sodium nitrate in the large porcelain boat containing Ppy, place it in an Ar-protect...

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Abstract

The invention discloses a defect-rich carbon material as well as a preparation method and an application thereof. The preparation method of the defect-rich carbon material comprises the following steps: (1) preparing or taking a carbon precursor material; (2) heating the carbon precursor material and an oxidation etching agent to 600-1000 DEG C in a protective atmosphere, and reacting for 2-4 hours to obtain an intermediate product; wherein the oxidation etching agent is a substance which can generate an etching effect on carbon or a substance which can be pyrolyzed to generate an oxidizing substance or release an oxidizing atmosphere; and (3) carrying out post-treatment on the intermediate product to obtain the defect-rich carbon material. The defect-rich carbon material can serve as a catalyst to be applied to a fuel cell and replace a traditional catalyst, the catalytic activity is greatly improved, the preparation technology is simple, operation is easy and convenient, and the defect-rich carbon material can meet the requirements of different technological processes.

Description

technical field [0001] The invention relates to the field of carbon-containing catalytic materials, in particular to a defect-rich carbon material and its preparation method and application. Background technique [0002] A fuel cell is a new type of power generation device that directly converts the chemical energy generated by the oxidation and reduction of fuel and oxidant into electrical energy. It has the advantages of environmental protection, high energy conversion efficiency, and fast start-up and shutdown. However, the development of fuel cells is still constrained by the slow kinetics of the cathode oxygen reduction reaction (ORR, oxygen reduction reaction) and the limited actual energy density. The oxygen reduction catalyst of the air cathode plays a crucial role in the performance of the battery and largely determines the overall energy efficiency of the battery. Designing and developing efficient oxygen reduction catalysts has become a key technology and researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/90
CPCC01B32/05H01M4/90Y02E60/50
Inventor 刘素琴叶冠英
Owner CENT SOUTH UNIV
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