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Preparation method of a transition metal-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst

A technology of carbon nanotubes and transition metals, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effects of low price, easy large-scale preparation, and excellent oxygen catalytic reduction performance

Active Publication Date: 2022-05-10
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

However, how to effectively increase the number of catalytic active sites of activated carbon, increase its degree of graphitization, and further improve the ORR catalytic performance of activated carbon is still a huge challenge in this field.

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  • Preparation method of a transition metal-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst
  • Preparation method of a transition metal-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst
  • Preparation method of a transition metal-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst

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Embodiment 1

[0024] A method for preparing cobalt-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst, said preparation method comprising the steps of:

[0025] ①Activated carbon carrier pretreatment: Soak the activated carbon in 5mol / L nitric acid solution for 12 hours, filter after soaking, wash the activated carbon with deionized water, remove the remaining nitric acid, and dry at 80°C;

[0026] ②In situ growth of CoZn-ZIF on activated carbon: 2.825mmol Co(NO 3 ) 2 ·6H 2 O and 2.825mmol Zn(NO 3 ) 2 ·6H 2 O was dissolved in 80mL methanol to form solution A; 45.07mmol 2-methylimidazole was dissolved in 80mL methanol to form solution B; 1.65g of the product obtained in step ① was added to solution B and stirred for 6h to form a mixed solution; solution A was added Stir and react in the mixture for 24 hours at 25°C. After the reaction, centrifuge to obtain the precipitate, wash it with methanol three times ultrasonically, and dry it in vacuum at 80°C;

[0027] ③H...

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Abstract

The invention relates to a preparation method of a transition metal-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst, which belongs to the field of catalyst preparation. Including activated carbon carrier pretreatment, in situ growth of metal organic framework compounds on activated carbon, high temperature pyrolysis carbonization; the steps of in situ growth of metal organic framework compounds on activated carbon are: dissolving transition metal salt and zincate in solvent Form solution A; dissolve nitrogen-containing organic ligands in a solvent to form solution B; add activated carbon after pretreatment to solution B to form a mixed solution; add solution A to the mixed solution for reaction, separate the precipitate after the reaction, and wash ,dry. The catalyst has abundant pyridinic nitrogen, graphitic nitrogen and metal nitrogen catalytic active sites, highly dispersed transition metal nanoparticles and carbon nanotubes, a developed three-dimensional pore structure, and a high degree of graphitization, so it has a high oxygen reduction catalytic performance, and can be widely used in the catalytic reduction of oxygen in the air electrode of various fuel cells.

Description

technical field [0001] The invention relates to a preparation method of a transition metal-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst, which belongs to the field of catalyst preparation. Background technique [0002] Microbial fuel cells can convert the chemical energy contained in organic matter in wastewater into electrical energy. Efficient cathode oxygen reduction (ORR) performance is crucial to ensure the energy conversion efficiency of microbial fuel cells. However, due to the low operating temperature (room temperature) and the neutral condition of the electrolyte of microbial fuel cells, it is difficult for the cathode ORR reaction to proceed according to the theoretical four-electron pathway. Slow cathode ORR kinetics will lead to increased cathode overpotential and reduce the power generation performance of microbial fuel cells. Therefore, there is an urgent need to develop highly active ORR catalysts suitable for microbial fuel cel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M8/16B82Y30/00B82Y40/00
CPCH01M4/9041H01M4/9083H01M8/16B82Y30/00B82Y40/00Y02E60/50
Inventor 刘伟凤朱益民郑立彪李喆郭瑞娟苗文静
Owner DALIAN MARITIME UNIVERSITY
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