Fuel cell catalyst with high-density active sites and preparation method thereof

A fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high cost, limited slow kinetics, insufficient catalyst performance and durability, etc., to accelerate oxygen reduction kinetics, improve interaction Force, cost reduction effect

Inactive Publication Date: 2021-12-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the general metal-nitrogen-carbon material is limited by the slow kinetics of the metal-nitrogen active center, the performance and durability of traditional commercial catalysts are insufficient, and the problem of high cost

Method used

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  • Fuel cell catalyst with high-density active sites and preparation method thereof
  • Fuel cell catalyst with high-density active sites and preparation method thereof
  • Fuel cell catalyst with high-density active sites and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] First, put 1g of Ketjen Black EC-600 in a tube furnace under an ammonia atmosphere and calcined at 850°C for 1h. After the calcining, cool to room temperature, grind and collect; Ketjen Black EC-600 high specific surface area carbon was added to deionized water for ultrasonication and stirred overnight; the stirred solution was freeze-dried and collected; the collected powder was calcined in a tube furnace at 600°C for 2 hours in an argon atmosphere , after calcination, a carbon-based Fe-N with highly dense active sites was obtained x -C. After that, take 40 mg carbon substrate Fe-N x -C, 4.4 mg H 2 PtCl 6 ·6H 2 O was added to 20ml of ethylene glycol (EG), and stirred continuously for 2h in an oil bath at 120°C. After the oil bath was completed, the product was centrifuged and washed several times with ultrapure water, and dried overnight at 60° C. under vacuum to obtain a catalyst loaded with Pt nanoparticles.

Embodiment 2

[0042]First, put 1g of Ketjen Black EC-600 in a tube furnace under an ammonia atmosphere and calcined at 900°C for 1h. After the calcining, cool to room temperature, grind and collect it; Ketjen Black EC-600 high specific surface area carbon was added to deionized water for ultrasonication and stirred overnight; the stirred solution was freeze-dried and collected; the collected powder was calcined in a tube furnace at 700°C for 2 hours in an argon atmosphere , after calcination, a carbon-based Fe-N with highly dense active sites was obtained x -C. After that, take 40 mg carbon substrate Fe-N x -C, 4.4 mg H 2 PtCl 6 ·6H 2 O was added to 20ml of ethylene glycol (EG), and stirred continuously for 3h in an oil bath at 120°C. After the oil bath was completed, the product was centrifuged and washed several times with ultrapure water, and dried overnight at 60° C. under vacuum to obtain a catalyst loaded with Pt nanoparticles.

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Abstract

The invention relates to a fuel cell oxygen reduction catalyst with high-density active sites and a preparation method thereof, the catalyst is composed of specially designed high-density Fe-Nx-C and platinum nanoparticles loaded on the Fe-Nx-C, and the catalyst is characterized in that the high-density Fe-Nx active sites are not mutually agglomerated; however, the Fe-Nx-C substrate with a special structure has very good oxygen reduction activity, and a small amount of nano platinum particles loaded on the Fe-Nx-C substrate can fully exert the activity of the Fe-Nx-C substrate due to the synergistic effect of a carrier and metal instead of regional intensive active sites under the action of thermal coupling. According to the method, the problem of insufficient performance of a traditional carbon substrate is solved to a certain extent, the use amount of platinum is reduced, and the fuel cell oxygen reduction catalyst has a good prospect in practical application of the low-temperature hydrogen energy fuel cell.

Description

technical field [0001] The invention relates to a fuel cell oxygen reduction catalyst with highly dense active sites and a preparation method thereof, belonging to the technical field of fuel cell catalysts. Background technique [0002] Among many new energy sources, a fuel cell is a device that directly converts chemical energy stored in fuels and oxidants into electrical energy. It has the advantages of high reliability, environmental friendliness, high energy density, and low noise, and has been researched all over the world. extensive research by researchers. Fuel cells can be divided into the following types according to the type of battery electrolyte: solid oxide fuel cell (SOFC), proton exchange membrane fuel cell (PEMFC), alkaline fuel cell (AFC), molten carbonate fuel cell (MCFC) and Phosphoric acid fuel cell (PAFC). Among them, the proton exchange membrane fuel cell has gradually become an ideal power source for large buses and submarines due to its advantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/96H01M4/88
CPCH01M4/926H01M4/96H01M4/8885H01M4/8878Y02E60/50
Inventor 周嵬胡斌张军袁菁琳舒清华邵宗平
Owner NANJING UNIV OF TECH
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