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Preparation method of cathode oxygen reduction reaction catalyst based on two-dimensional graphite phase carbon nitride cobalt doped porous carbon material

A technology of cobalt carbonitride and porous carbon materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of toxicity, single synthesis cost of precursors, and high cost of platinum-based catalytic materials

Active Publication Date: 2021-09-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing fuel cell catalysts and overcome the defects of the prior art. At present, fuel cell catalysts generally face the problems of single precursor and synthesis cost, and the high cost and toxicity of platinum-based catalytic materials. defects; based on 2D layered g-C 3 N 4 Materials, developed a porous carbon material that uses tannin as a linking agent and terephthalic acid to immobilize metal Co, which has high onset potential, half-slope potential, excellent limiting current, excellent stability and good methanol Tolerance, strong resistance to methanol poisoning, etc.

Method used

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  • Preparation method of cathode oxygen reduction reaction catalyst based on two-dimensional graphite phase carbon nitride cobalt doped porous carbon material
  • Preparation method of cathode oxygen reduction reaction catalyst based on two-dimensional graphite phase carbon nitride cobalt doped porous carbon material
  • Preparation method of cathode oxygen reduction reaction catalyst based on two-dimensional graphite phase carbon nitride cobalt doped porous carbon material

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preparation example Construction

[0047] The invention provides a method for preparing a porous carbon material based on two-dimensional graphite phase carbon nitride cobalt doping and using the material as an oxygen reduction catalyst.

[0048] The active substance described in the present invention is abbreviated as C 3 N 4 @Co-BDC-TA.

[0049] C in the present invention 3 N 4 @Co-BDC-TA composites are prepared by thermal decomposition.

[0050] The present invention uses a platinum electrode as a counter electrode, and a saturated silver chloride electrode (Ag / AgCl) as a reference electrode respectively, C 3 N 4 A glassy carbon electrode made of @Co-BDC-TA composite was used as the working electrode.

[0051] A catalyst ink (ink) was prepared by weighing 4 mg of the catalyst of the present invention with a balance and dispersing it in 1 mL of a mixed solution (235 μL of deionized water, 750 μL of isopropanol and 15 μL of 5 wt% Nafion solution). Then gradually drop 28 μL of ink onto the surface of the...

Embodiment 1

[0060] This example shows a C 3 N 4 The synthetic method of @Co-BDC-TA composite material, comprises the following steps:

[0061] (1) Put a certain amount of melamine in a 50 mL ceramic crucible (with lid);

[0062] (2) Heat the crucible to 555 °C in a muffle furnace, keep it for 4 h, and cool down naturally to obtain a light yellow powder g-C 3 N 4 ;

[0063] (3) Weigh 400 mg of light yellow powder g-C obtained in step (2) 3 N 4 , dispersed in 40 mL of absolute ethanol and ultrasonicated for 30 min to obtain liquid A;

[0064] (4) Dissolve 84.7 mg of terephthalic acid (BDC) and 36.4 mg of cobalt nitrate hexahydrate (1:2.5) in 10 mL of TA solution (5 mmol / L, 0.8506 g of tannin in 100 mL of deionized water ), to obtain liquid B;

[0065] (5) Slowly add solution B into solution A which is magnetically stirred at 50 °C and 800 rpm, and keep stirring for 6 h;

[0066] (6) Evaporate the solution obtained in step (5) to dryness in a water bath at 80 °C, and dry it under va...

Embodiment 2

[0069] (1) Put a certain amount of melamine in a 50 mL ceramic crucible (with lid);

[0070] (2) Heat the crucible to 555 °C in a muffle furnace, keep it for 4 h, and cool down naturally to obtain a light yellow powder g-C 3 N 4 ;

[0071] (3) Weigh 400 mg of light yellow powder g-C obtained in step (2) 3 N 4 , dispersed in 40 mL of absolute ethanol and ultrasonicated for 30 min to obtain liquid A;

[0072] (4) Dissolve 84.7 mg terephthalic acid (BDC) and cobalt nitrate hexahydrate in 10 mL TA solution (5 mmol / L, 0.8506 g tannins were dissolved in 100 mL deionized water) to obtain liquid B;

[0073] (5) Slowly add solution B into solution A which is magnetically stirred at 50 °C and 800 rpm, and keep stirring for 6 h;

[0074] (6) Evaporate the solution obtained in step (5) to dryness in a water bath at 80 °C, and dry it under vacuum at 80 °C overnight to obtain C 3 N 4 @Co-BDC-TA powder;

[0075] (7) Put the vacuum-dried product in a tube furnace (argon atmosphere) ...

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Abstract

The invention relates to a preparation method of a cathode oxygen reduction reaction catalyst based on a two-dimensional graphite phase carbon nitride cobalt doped porous carbon material. An active substance of a nano material is C3N4@Co-BDC-TA. The problems existing in an existing fuel cell catalyst are solved, the defects in the prior art are overcome, the problems of single precursor obstacle and low synthesis cost of the existing fuel cell catalyst are generally faced, and the defects of high cost, toxicity and the like of a platinum-based catalytic material are overcome; and on the basis of a two-dimensional layered g-C3N4 material, a porous carbon material formed by taking tannin as a connecting agent and fixing metal Co with terephthalic acid is developed, and the porous carbon material has the advantages of relatively high initial potential and half-slope potential, excellent limiting current, excellent stability, good methanol tolerance, relatively high methanol poisoning resistance and the like.

Description

technical field [0001] The invention belongs to the field of oxygen reduction electrocatalysis, and in particular relates to a preparation method of a cathode oxygen reduction reaction catalyst based on two-dimensional graphite phase carbon cobalt doped porous carbon material. Background technique [0002] With the continuous consumption of traditional energy sources in the world and the increasingly serious environmental pollution problems, a fuel cell is a device that directly converts the chemical energy of fuel into electrical energy through chemical energy. Polymer electrolyte membrane fuel cells (PEMFCs) have been extensively studied due to their high specific energy, convenient operation, and environmental friendliness. Over the years, PEMFCs have made great progress in many aspects, their performance has been greatly improved, and commercial applications have basically been realized. However, poor durability and catalyst poisoning are the main bottlenecks limiting t...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/86H01M4/88
CPCH01M4/8673H01M4/9083H01M4/88Y02E60/50
Inventor 肖高林惠影
Owner FUZHOU UNIV
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