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Co-N double-doped flaky porous two-dimensional carbon material and preparation method thereof

A two-dimensional carbon material, double-doping technology, used in electrical components, battery electrodes, circuits, etc., can solve the problem of poor tolerance and long-term operation stability, catalytic activity and stability need to be further improved, and low catalytic activity. It can solve the problem of cost and stability, improve the electrochemical catalytic performance, and the raw materials are cheap and easy to obtain.

Inactive Publication Date: 2016-04-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, noble metal catalysts are used in power devices, and their disadvantages are limited resources, high prices, CH 3 OH / CO tolerance and long-term operation stability are poor; while the expected non-precious metal catalysts are rich in resources and low in price, but their catalytic activity is far lower than that of noble metal catalysts, and the catalytic activity and stability need to be further improved

Method used

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  • Co-N double-doped flaky porous two-dimensional carbon material and preparation method thereof
  • Co-N double-doped flaky porous two-dimensional carbon material and preparation method thereof
  • Co-N double-doped flaky porous two-dimensional carbon material and preparation method thereof

Examples

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Embodiment 1

[0036] A Co-N double-doped sheet-like porous two-dimensional carbon material, and its preparation method includes the following steps:

[0037] 1) Soak montmorillonite in a 0.5mol / L sulfuric acid solution, ultrasonically disperse and stir for 24 hours, then filter, dry, and grind to obtain a powdery template for use;

[0038] 2) Dissolve the powdered template in water to prepare an aqueous solution with a concentration of 2mg / ml. Disperse uniformly by ultrasonic. Then add the aqueous solution of cobalt nitrate and stir vigorously for 6 hours. Then add the aqueous solution of dimethylimidazole and stir for 30 minutes to mix evenly. The molar ratio of dimethylimidazole to dimethylimidazole is 1:4; the mass ratio of montmorillonite to cobalt nitrate is 0.1:1;

[0039] 3) Place the solution obtained in step 2) in a reaction kettle and heat it to 85°C for constant temperature reaction for 24 hours. The resulting product is subjected to centrifugal separation, washing (washing with deioniz...

Embodiment 2

[0049] A Co-N double-doped sheet-like porous two-dimensional carbon material. The preparation method is roughly the same as that of Example 1, except that the molar ratio of cobalt nitrate and dimethylimidazole in step 2) is 0.1:4. The mass ratio of montmorillonite to cobalt nitrate is 0.8:1; the carbonization temperature used in step 4) is 700° C., and the carbonization time is 5 hours.

[0050] The Co-N double-doped sheet-like porous two-dimensional carbon material prepared in this example was electrochemically tested. The test method was the same as that in Example 1. Its peak potential was 0.17V (vs.Hg / HgO) and the limiting current density was about 5mA / cm 2 .

Embodiment 3

[0052] A Co-N double-doped sheet-like porous two-dimensional carbon material. The preparation method is roughly the same as that of Example 1, except that the molar ratio of cobalt nitrate and dimethylimidazole in step 2) is 0.2:4. The mass ratio of montmorillonite to cobalt nitrate is 0.4:1; the carbonization temperature used in step 4) is 800°C, and the carbonization time is 2h.

[0053] The Co-N double-doped sheet-like porous two-dimensional carbon material prepared in this example was electrochemically tested. The test method was the same as that of Example 1. Its peak potential was 0.10V (vs.Hg / HgO) and the limiting current density was about 5mA / cm 2 .

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Abstract

The invention discloses a Co-N double-doped flaky porous two-dimensional carbon material and a preparation method thereof. The preparation method of the Co-N double-doped flaky porous two-dimensional carbon material comprises the following steps: (1) carrying out acidation modification on a template; (2) dissolving the modified template into a solvent, ultrasonically dispersing the solvent evenly, adding a metallic salt solution, intensely stirring the solution, adding an organic ligand solution and stirring the solution evenly; (3) reacting the solution obtained in the step (2), and carrying out centrifugal separation, washing and drying on the obtained product; (4) carrying out carbonization treatment; and (5) stirring and pickling the obtained carbonized product, and finally separating, washing and drying the product. The Co-N double-doped flaky porous two-dimensional carbon material prepared by the method is used as a cathode catalyst for a fuel cell, can demonstrate excellent electrocatalytical properties, and is low in related cost, simple to prepare, high in specific surface area, good in electrocatalytical activity, good in stability and suitable for popularization and application.

Description

Technical field [0001] The invention belongs to the field of new energy materials, and specifically relates to a Co-N double-doped sheet-shaped porous two-dimensional carbon material and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells, methanol fuel cells, water electrolysis devices and integrated renewable fuel cells are power generation devices that directly convert chemical energy in fuel into electrical energy through electrochemical reactions without burning. It is a green Energy technology, compared with previous storage batteries and rechargeable batteries, has the characteristics of high energy, high power, no pollution, high efficiency and miniaturization, and its future popularity and market prospects are widely expected. However, catalysts, especially cathode oxygen reduction catalysts, such as platinum-based catalysts, are the mainstream catalysts for fuel cell electrodes. Due to their high cost, low catalytic efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/88H01M4/9083Y02E60/50
Inventor 唐浩林吴佳宾曾燕王锐魏希蔡世昌
Owner WUHAN UNIV OF TECH
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