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Preparation method of an iron-based nitrogen-phosphorus co-doped porous carbon-oxygen reduction catalyst

A co-doping and catalyst technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of complex process, poor stability, and low electrochemical performance, and achieve the effect of enhancing ORR performance

Active Publication Date: 2022-04-29
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0007] The technical problem solved by the present invention is: in order to solve the defects of complex process, poor stability and low electrochemical performance existing in the existing non-precious metal catalysts, the present invention provides an iron-based nitrogen-phosphorus co-doped porous carbon-oxygen reduction catalyst preparation method

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  • Preparation method of an iron-based nitrogen-phosphorus co-doped porous carbon-oxygen reduction catalyst
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  • Preparation method of an iron-based nitrogen-phosphorus co-doped porous carbon-oxygen reduction catalyst

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preparation example Construction

[0037] see Figure 1-Figure 6 , the present invention provides a preparation method and application of an iron-based nitrogen-phosphorus co-doped porous carbon ORR catalyst to solve the existing problems of complex process flow, poor stability and unsatisfactory electrochemical performance.

[0038] The present invention is specifically realized through the following technical solutions:

[0039] First, prepare a nitrogen-phosphorus co-doped nanosheet material (CNP1000), including the following steps:

[0040] Prepare a mixed solution containing urea, anhydrous glucose, phytic acid and deionized water; evaporate the mixed solution to dryness and put it into a vacuum oven to obtain the product; put the obtained product into a tube furnace for high-temperature carbonization treatment, and finally A nitrogen-phosphorus co-doped nanosheet material was obtained, which was named CNP1000.

[0041] The step of preparing the mixed solution containing urea, glucose anhydrous, phytic a...

Embodiment 1

[0049] A preparation method of nitrogen and phosphorus co-doped nano sheet material (CNP1000), comprising the following steps:

[0050] (1) Use an analytical balance to weigh 4g of urea and 400mg of anhydrous glucose into a 100mL beaker, use a pipette gun to add 1mL of phytic acid solution into the beaker, then add 40mL of deionized water to the beaker, and place the beaker Stir evenly on a magnetic stirrer.

[0051] (2) Evaporate the mixed solution prepared in step (1) at 80° C. until it is evaporated to dryness, and then put it into a vacuum oven and dry at 60° C. for 12 hours to obtain the product.

[0052] (3) Distribute the product prepared in step (2) evenly in an alumina dry pot, place the dry pot in a tubular high-temperature furnace, and continuously feed nitrogen gas at a rate of 15 mL / min at a rate of 5 °C / min. Raise the temperature to 1000°C. After heat preservation for 1 h, the temperature was lowered to 300 °C at a rate of 10 °C / min, and then the temperature wa...

Embodiment 2

[0054] An iron-based nitrogen-phosphorus co-doped nanosheet material (FP 0.1 @CNP1000), including the following steps:

[0055] (1) Weigh 0.1 mg of iron phthalocyanine into a 100 mL beaker with an analytical balance, add 50 mL of absolute ethanol into the beaker, and completely disperse the iron phthalocyanine in absolute ethanol.

[0056] (2) Weigh 25 mg of CNP1000 prepared in Example 1 and add it into a beaker. Place the beaker in an ultrasonic device and continue ultrasonication for 1 hour, then transfer the beaker to a stirring table, evaporate to dryness at 60°C, and form a cake-like black material at the bottom of the beaker. Then put the whole beaker into an oven and dry it at 60°C for 12 hours. The resulting product is iron-based nitrogen-phosphorus co-doped nanosheet material, named FP 0.1 @CNP1000.

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Abstract

The invention relates to a preparation method of an iron-based nitrogen-phosphorus co-doped porous carbon-oxygen reduction catalyst. The urea molecules, glucose molecules and phytic acid molecules are self-polymerized in an aqueous solution, evaporated and dried to obtain a precursor. During the high-temperature carbonization process of the precursor, a large number of pore structures are formed, and a small amount of nitrogen and phosphorus remain. Then use the molecular self-assembly method to combine iron phthalocyanine molecules with nitrogen and phosphorus co-doped porous carbon materials. The obtained material still has a sheet-like morphology and porous structure, but iron phosphide nanoparticles-graphite are formed in the sheet-like structure. The carbon core-shell structure, multiple active sites and porosity make the ORR performance of the material enhanced compared with nitrogen and phosphorus co-doped porous carbon materials. The present invention forms a core-shell structure covered by carbon shells, which enhances the catalytic activity and durability of oxygen reduction; in addition, there are a large number of mesopores in the material, which improves the oxygen reduction capacity of the material. The method is simple to prepare, simple to operate, and easy to promote.

Description

technical field [0001] The invention belongs to the field of fuel cell catalysts, in particular to a preparation method of an iron-based nitrogen-phosphorus co-doped porous carbon-oxygen reduction catalyst. Background technique [0002] In recent years, fuel cells have attracted the attention of researchers as a green and environmentally friendly energy source, and have been widely used in mobile devices and aerospace fields. At present, noble metal-based catalysts represented by platinum occupy the vast majority of the fuel cell cathode oxygen reduction catalyst market. The catalyst has the characteristics of good catalytic performance and strong adaptability, and is widely accepted. However, its high price, poor stability, and low reserves limit its commercialization. Therefore, the study of non-noble metal catalysts is of great significance for the development of fuel cells. [0003] Transition metal-based nitrogen and phosphorus co-doped carbon materials belong to non...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/94H01M4/96H01M4/88
CPCH01M4/9083H01M4/96H01M4/94H01M4/90H01M4/8825Y02E60/50
Inventor 康永刚杨文武闫鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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