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Preparation method and application of octahedral nitrogen doped carbon framework material

A framework material and octahedral technology, applied in the field of composite carbon materials, can solve the problems of easy agglomeration, small specific surface area, limited catalytic ability, etc., and achieve the effects of strong anti-poisoning ability, good stability and low cost.

Inactive Publication Date: 2018-11-13
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem of fuel cell cathode oxygen reduction catalyst has been a major bottleneck plaguing fuel cell technology
However, due to the small specific surface area and a small amount of pore structure of these carbon materials, the improvement of their catalytic ability is limited.
And low-dimensional carbon materials are very easy to agglomerate and agglomerate in the electrocatalytic process under harsh chemical conditions (strong acid, strong alkali solution), thus covering the contact between the catalytic active sites and the substrate, thereby reducing the catalytic ability of the material and stability

Method used

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  • Preparation method and application of octahedral nitrogen doped carbon framework material
  • Preparation method and application of octahedral nitrogen doped carbon framework material
  • Preparation method and application of octahedral nitrogen doped carbon framework material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 0.415 g of terephthalic acid and 1.35 g of ferric chloride hexahydrate, dissolve in 30 mL of DMF, treat at 110 °C for 24 hours, wash with DMF and ethanol in turn, and obtain a relatively pure precursor substance (MIL-101(Fe )).

[0033] Add 20 mL methanol to a 100 mL flask, then add 0.4 g precursor, 0.5 g urea, and ultrasonically disperse for half an hour; after standing still, filter with suction, dry the product in an oven and put it in a tube furnace, blow nitrogen, 800 heat treatment at ℃ for 2 hours, take it out, grind it, then add it to a sulfuric acid solution with a concentration of 0.5 M, treat it at 60 ℃ for 12 hours, filter it with suction, wash it with water, and dry it to obtain an octahedral nitrogen-doped carbon framework material catalyst.

[0034] Compared with the commercial platinum-carbon catalyst, the octahedral nitrogen-doped carbon framework material catalyst has a half-potential difference of 30 mV; at -0.2V, the ratio of the initial current...

Embodiment 2

[0036] Take 0.415 g of terephthalic acid and 1.35 g of ferric chloride hexahydrate, dissolve in 30 mL of DMF, treat at 110 °C for 24 hours, wash with DMF and ethanol in turn, and obtain a relatively pure precursor substance (MIL-101(Fe )).

[0037] Add 20 mL of ethanol to a 100 mL flask, then add 0.4 g of the above precursors, 0.1 g of melamine, and ultrasonically disperse for 2 hours; after standing still, filter with suction, dry the product in an oven, put it in a tube furnace, and pass it into Nitrogen, heat treatment at 650 °C for 1 hour, take it out, and grind it; then add it to a 0.5 M hydrochloric acid solution, treat it at 60 °C for 16 hours, filter with suction, wash with water, and dry to obtain an octahedral nitrogen-doped carbon framework material catalyst.

[0038] Compared with the commercial platinum-carbon catalyst, the octahedral nitrogen-doped carbon framework material catalyst has a half-potential increase of 5 mV; at -0.2V, the ratio of the initial current...

Embodiment 3

[0040] Take 0.415 g of terephthalic acid and 1.35 g of ferric chloride hexahydrate, dissolve in 30 mL of DMF, treat at 110 °C for 24 hours, wash with DMF and ethanol in turn, and obtain a relatively pure precursor substance (MIL-101(Fe )).

[0041] Add 20 mL of acetone to a 100 mL flask, then add 0.4 g of the above precursors and 0.3 g of ammonium phosphate, ultrasonicate for 4 hours, let stand, and filter with suction. Nitrogen, heat treatment at 950°C for 4 hours, take it out, grind it, then add it to a 2M nitric acid solution, treat it at 80°C for 16 hours, filter it with suction, wash it with water, and dry it to obtain an octahedral nitrogen-doped carbon framework material catalyst .

[0042] Compared with the commercial platinum-carbon catalyst, the octahedral nitrogen-doped carbon framework material catalyst has a half-potential difference of 20 mV; at -0.2V, the ratio of the initial current to the current after 30000 s is 10 percentage points higher than that of the com...

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Abstract

The invention provides an octahedral nitrogen doped carbon framework material for oxygen reduction reaction of fuel cell cathodes. Firstly, terephthalic acid and ferric trichloride hexahydrate performhydrothermal reaction in DMF to obtain a precusor substance; then, in a polar solvent, the precusor substance and a nitrogen-rich substance perform reaction under the ultrasonic condition for 2-6 hours, standing, suction filtration and drying are performed, then the mixture is put in a tube furnace, nitrogen is introduced for protection, thermal treatment is performed at the temperature of 400-1200 DEG C for 1-6 hours, and a product is treated with an acid solution and is washed and dried to obtain the octahedral nitrogen doped carbon framework material. The octahedral nitrogen doped carbon framework material serves as a catalyst for oxygen reduction reaction of fuel cell cathodes. Compared with a traditional precious metal catalyst, the octahedral nitrogen doped carbon framework materialhas the advantages of being low in cost, high in activity, strong in poison tolerance capability, good in stability and the like and is an ideal catalytic material for oxygen reduction reaction of fuel cell cathodes.

Description

technical field [0001] The invention relates to the preparation of a nitrogen-doped carbon material, in particular to the preparation of an octahedral nitrogen-doped carbon skeleton material, which is mainly used as a catalyst for fuel cell cathode oxygen reduction reaction, and belongs to the field of composite carbon materials and the technical field of fuel cells. Background technique [0002] A fuel cell is a power generating device that converts chemical energy in fuel into electrical energy. Fuel cells have attracted great attention due to their high efficiency in providing energy, low emissions, safe and convenient storage and transportation, low noise, normal temperature use, convenient fuel carrying and replenishment, and no mechanical vibration. However, the problem of fuel cell cathode oxygen reduction catalyst has been a major bottleneck plaguing fuel cell technology. Because the reaction speed of the oxygen reduction process at the cathode of the fuel cell is s...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/96
CPCH01M4/8825H01M4/9083H01M4/96Y02E60/50
Inventor 雷自强陶鹏宇王伟康玉茂王鹏德
Owner NORTHWEST NORMAL UNIVERSITY
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