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A kind of femn bimetal single atom oxygen reduction catalyst and its preparation method and application

A monoatomic oxygen and catalyst technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as poor stability, and achieve the effects of low cost, simple preparation process, and easy mass production

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current Fe-N-C catalyst wants to have a large-scale commercial application, and there is still a shortcoming that it has poor stability in the catalytic process.

Method used

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  • A kind of femn bimetal single atom oxygen reduction catalyst and its preparation method and application
  • A kind of femn bimetal single atom oxygen reduction catalyst and its preparation method and application
  • A kind of femn bimetal single atom oxygen reduction catalyst and its preparation method and application

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Experimental program
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Effect test

preparation example Construction

[0042] Preparation of test electrodes:

[0043] Accurately weigh 10.0 mg of the prepared catalyst sample and place it in a 10 mL serum bottle, inject 1.0 mL of 0.84 wt% Nafion ethanol solution, and ultrasonically treat it for 1 h to disperse it evenly. Then, 10.0 μL of the dispersed solution was dropped onto the surface of a 5 mm disk electrode, and the modified electrode was obtained after natural drying.

[0044] Performance testing process:

[0045] During performance testing, it is necessary to continuously bubble N into 0.1M KOH 2 or O 2 , to ensure an oxygen-free or oxygen-saturated state. Before the performance test, it is necessary to pass through the N 2 Cyclic voltammetry (CV) was performed in the electrolytic cell to activate the catalyst. CV test parameters: the test potential window is 0-1.23V (vs.RHE), the sweep speed and the number of turns are set to 20mVs respectively -1 and 20.

[0046] In the access O 2Under certain conditions, linear sweep voltammet...

Embodiment 1

[0048] A preparation method of FeMn double metal single-atom oxygen reduction catalyst, comprising the steps of:

[0049] (1) Preparation of NC: Grind 0.5 g of Ketjen Black and 2.5 g of melamine evenly, put them into a porcelain boat, place them in a tube furnace, and calcine them at 800°C under the protection of argon to collect N-doped carbon. (Nitrogen-containing carbon substrate), named NC; calcination program parameters are as follows: heating rate 3 ° C min -1 , the temperature is 800°C, and the holding time is 1h.

[0050] (2) Preparation of F-FeMn / NC-1: Take 180mg of NC (nitrogen-containing carbon substrate), 0.5g of F-127 (pore forming agent), 50mg of Fe(NO 3 ) 3 9H 2 O (0.12mmol) and 100mg of MnCl 2 4H 2 O (0.50mmol), 335mg of o-phenylenediamine (ligand) and 3g of melamine (nitrogen source) were added to 75ml of ethanol and stirred for 1 hour to make them mix and disperse evenly to obtain a mixed solution; The system was evaporated to dryness, dried in a vacuum...

Embodiment 2

[0057] A preparation method of FeMn double metal single-atom oxygen reduction catalyst, comprising the steps of:

[0058] (1) Preparation of NC: Grind 0.5 g of Ketjen Black and 5.0 g of melamine evenly, put them into a porcelain boat, place them in a tube furnace, and calcine them at 800°C under the protection of argon to collect N-doped carbon. (Nitrogen-containing carbon substrate), named NC; calcination program parameters are as follows: heating rate 3 ° C min -1 , the temperature is 800°C, and the holding time is 2h.

[0059] (2) Preparation of F-FeMn / NC-2: Take 180mg of NC (nitrogen-containing carbon substrate), 0.5g of F-127 (pore forming agent), 100mg of Fe(NO 3 ) 3 9H 2 O (0.24mmol) and 100mg of MnCl 2 4H 2 O (0.50mmol), 335mg of o-phenylenediamine (ligand) and 3g of melamine (nitrogen source) were added to 75ml of ethanol and stirred for 1 hour to make them mix and disperse evenly to obtain a mixed solution; The system was evaporated to dryness, dried in a vacuu...

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Abstract

The invention discloses a FeMn bimetal single-atom oxygen reduction catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing a nitrogen-containing carbon substrate, a nitrogen source, a ligand, a pore-forming agent and a metal salt in ethanol, then evaporating and drying, grinding and calcining to obtain a porous carbon-supported FeMn bimetallic single-atom oxygen reduction catalyst. The oxygen reduction electrocatalyst provided by the present invention uses non-noble metals Fe-Nx and Mn-Nx as active sites, wherein iron and manganese elements are uniformly distributed in the form of single atoms, which effectively improves the utilization rate of atoms, and at the same time The reaction exhibited excellent catalytic activity and stability, which has important theoretical and practical significance for the development of new oxygen reduction catalysts and fuel cells.

Description

technical field [0001] The invention belongs to the field of oxygen reduction catalysts, and in particular relates to a FeMn bimetallic single-atom oxygen reduction catalyst and its preparation method and application. Background technique [0002] In recent years, the energy crisis has attracted the attention of countries all over the world. As a new type of energy conversion device, fuel cells play an important role in solving energy problems. However, the cathode oxygen reduction reaction kinetics of fuel cells is slow, requiring noble metals as catalysts to accelerate the reaction rate. This has seriously hindered the large-scale application of fuel cells. Many scientists use precious metals to prepare various nanostructures, and use precious metals and cheap transition metals to form alloys or core-shell structures to reduce the amount of precious metals used, but a large amount of precious metals is still required. Therefore, it is urgent to develop non-noble metal c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90B22F9/24
CPCH01M4/9041H01M4/9083B22F9/24Y02E60/50
Inventor 余宇翔李杰蒋军生
Owner SOUTH CHINA UNIV OF TECH