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A kind of non-noble metal nitrogen-doped MOF double-effect electrocatalyst and preparation method thereof

A non-precious metal, electrocatalyst technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of active sites of catalysts and immature reaction mechanism

Active Publication Date: 2021-01-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the research on non-platinum catalysts has made great progress, the stability in acidic environment and other aspects need to be further improved, and the research on the active site and reaction mechanism of this type of catalyst is still immature (LEFEVRE M. et al. , Science, 2009)

Method used

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  • A kind of non-noble metal nitrogen-doped MOF double-effect electrocatalyst and preparation method thereof
  • A kind of non-noble metal nitrogen-doped MOF double-effect electrocatalyst and preparation method thereof
  • A kind of non-noble metal nitrogen-doped MOF double-effect electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] 0.5g of surfactant F127 was fully dissolved in 130mL of deionized H 2 Add 0.5g of tannic acid, 1.5g of imidazole and 1g of urea in sequence in O, and take an oil bath at 105°C to ensure that the organic matter of carbon and nitrogen sources is fully combined, and add 20mL of 0.1mol L -1 FeCl 3 Fully chelate with organic matter, and obtain the primary precursor at 105°C for 6h. Put the precursor in a high-pressure reactor at 105°C for 48 hours, and hydrothermally crystallize to ensure that the crystal grows fully, so as to obtain a uniformly dispersed precursor; the precursor is centrifugally dried and placed in N 2 Fully heat treatment at 5°C / min under the atmosphere, 800°C-2h, to obtain an active catalyst with a high degree of graphitization and a high specific surface area. Catalyst physical characterization as Figure 1-10 As shown, the catalyst performance is as Figure 11 , 12 , 13 shown.

Embodiment 2

[0097] 0.5g of surfactant F127 was fully dissolved in 130mL of deionized H 2 In O, add 2.8g of tannic acid, 2.8g of imidazole and 1g of urea in sequence, and take an oil bath at 105°C to ensure that the carbon and nitrogen sources are fully combined, and then add 20mL of 0.1mol L -1 FeCl 3 Fully chelate with organic matter, and obtain the primary precursor at 105°C for 6h. Put the precursor in a high-pressure reactor at 105°C for 48 hours, and hydrothermally crystallize to ensure that the crystal grows fully, so as to obtain a uniformly dispersed precursor; the precursor is centrifugally dried and placed in N 2 Fully heat treatment at 5°C / min under the atmosphere, 800°C-2h, to obtain an active catalyst with a high degree of graphitization and a high specific surface area. Catalyst performance comparison such as Figure 14 shown.

Embodiment 3

[0099] 0.5g of surfactant F127 was fully dissolved in 130mL of deionized H 2 In O, add 2.1g of tannic acid, 2.1g of imidazole and 1g of urea in sequence, and take an oil bath at 105°C to ensure that the carbon and nitrogen sources are fully combined, and then add 20mL of 0.1mol L -1 FeCl 3 Fully chelate with organic matter, and obtain the primary precursor at 105°C for 6h. Put the precursor in a high-pressure reactor at 105°C for 48 hours, and hydrothermally crystallize to ensure that the crystal grows fully, so as to obtain a uniformly dispersed precursor; the precursor is centrifugally dried and placed in N 2 Fully heat treatment at 5°C / min under the atmosphere, 800°C-2h, to obtain an active catalyst with a high degree of graphitization and a high specific surface area. Catalyst performance comparison such as Figure 14 shown.

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Abstract

The invention relates to a super-dispersion non-noble metal nitrogen-doped MOF double-effect electrocatalyst and a preparation method thereof. The preparation method comprises the following steps of 1) adding a hydroxyl-rich carbon source organic matter and a nitrogen-rich organic matter into a surfactant dispersed solution, and carrying out stirring and mixing; and enabling the carbon-nitrogen source organic matters to be reacted in the solution to obtain a primary precursor; 2) adding a transition metal solution, stirring at a constant temperature and sufficiently chelating with the organicprecursor; 3) putting the object obtained in the step 2) into a high-temperature kettle to carry out hydrothermal crystallization to promote crystals to grow slowly; 4) carrying out centrifuging, washing and drying on the object obtained in the step 3); and 5) carrying out high-temperature carbonization on the object obtained in the step 4) to obtain the catalyst. The catalyst has the advantages that the uniformly dispersed ultrafine metal nanoparticles are embedded and wrapped in a carbon shell, and the carbon layer structure is activated; and the catalyst has rich transition metals and nitrogen-bonded M-N chelating active sites, so that the catalyst stably exists in an acid solution, and has important application value and significance in the fields of fuel cells, water electrolysis andother electro-catalysis.

Description

technical field [0001] The invention belongs to the technical field of electrochemical catalysis, and in particular relates to a preparation method of a non-noble metal M-N doped MOF carbon-based catalyst. The catalyst has good catalytic activity for oxygen reduction process and hydrogen evolution reaction, and is mainly used in fuel cells and water electrolysis field. Background technique [0002] As a device for converting chemical energy into electrical energy, proton exchange membrane fuel cells (PEMFCs) have been widely used in stationary power stations, transportation, and portable power supplies. However, the cost and lifetime of Pt-based catalysts limit the large-scale commercialization of PEMFCs. The study of highly active non-Pt oxygen reduction catalysts is of great significance. Researchers have invested great enthusiasm, hoping that one day they can completely replace the noble metal Pt, so the research on non-noble metal catalysts has attracted widespread att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/9041H01M4/9083Y02E60/50
Inventor 赵卿王诚王建龙
Owner TSINGHUA UNIV
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