Carbon-based bimetallic Fe-Mn monatomic electrocatalyst, preparation method and application thereof

An electrocatalyst, bimetallic technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of low activity and poor stability, and achieve high efficiency oxygen reduction, high dispersion, and strong controllability.

Inactive Publication Date: 2021-02-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, M-N-C single-atom catalysts are mostly limited to the study of a single metal, and such catalysts still have problems such as low activity and poor stability in acidic environments.

Method used

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  • Carbon-based bimetallic Fe-Mn monatomic electrocatalyst, preparation method and application thereof
  • Carbon-based bimetallic Fe-Mn monatomic electrocatalyst, preparation method and application thereof
  • Carbon-based bimetallic Fe-Mn monatomic electrocatalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Preparation of catalyst:

[0042] a) Weigh 3g of carbon black (black pearls 2000, denoted as BP 2000) into a 200mL beaker, add 150mL of concentrated nitric acid (65-68%), stir at room temperature for 10h, and let stand overnight. The filtered solid was washed several times with deionized water until the washing solution was neutral, and then dried in an oven at 60°C overnight to obtain surface-functionalized BP 2000.

[0043] b) Take 0.15 g of surface-functionalized BP 2000, add 50 mL of absolute ethanol, and sonicate for 30 min. Add 0.047g of iron acetate and 0.067g of manganese acetate (the molar ratio of Fe and Mn is 1:1), fully stir to dissolve, add 0.32g of 1,10-phenanthroline, and stir for 20min. Weigh 0.5g of MgO and 30mL of absolute ethanol into the above mixed solution. Then the above suspension was vigorously stirred in a 60°C water bath for 10 hours, then evaporated to dryness in a water bath at 60°C, and dried overnight in a 60°C water bath to obtain Fe...

Embodiment 2

[0055] Catalyst preparation:

[0056] a) Weigh 3g of carbon black (black pearls 2000, denoted as BP 2000) into a 200mL beaker, add 150mL of concentrated nitric acid (65-68%), stir at room temperature for 10h, and let stand overnight. The filtered solid was washed several times with deionized water until the washing solution was neutral, and then dried in an oven at 60°C overnight to obtain surface-functionalized BP 2000.

[0057] b) Take 0.15 g of surface-functionalized BP 2000, add 50 mL of absolute ethanol, and sonicate for 30 min. Add 0.075g of iron acetate and 0.027g of manganese acetate (the molar ratio of Fe and Mn is 4:1), fully stir to dissolve, add 0.32g of 1,10-phenanthroline, and stir for 20min. Weigh 0.5g of MgO and 30mL of absolute ethanol into the above mixed solution. Then the above suspension was vigorously stirred in a 60°C water bath for 10 hours, then evaporated to dryness in a water bath at 60°C, and dried overnight in a 60°C water bath to obtain Fe, Mn(p...

Embodiment 3

[0062] Catalyst preparation:

[0063] a) Weigh 3g of carbon black (black pearls 2000, denoted as BP 2000) into a 200mL beaker, add 150mL of concentrated nitric acid (65-68%), stir at room temperature for 10h, and let stand overnight. The filtered solid was washed several times with deionized water until the washing solution was neutral, and then dried in an oven at 60°C overnight to obtain surface-functionalized BP 2000.

[0064] b) Take 0.15 g of surface-functionalized BP 2000, add 50 mL of absolute ethanol, and sonicate for 30 min. Add 0.019g of iron acetate and 0.107g of manganese acetate (the molar ratio of Fe and Mn is 1:4), fully stir to dissolve, add 0.32g of 1,10-phenanthroline, and stir for 20min. Weigh 0.5g of MgO and 30mL of absolute ethanol into the above mixed solution. Then the above suspension was vigorously stirred in a 60°C water bath for 10 hours, then evaporated to dryness in a water bath at 60°C, and dried overnight in a 60°C water bath to obtain Fe, Mn(p...

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Abstract

The invention provides a carbon-based bimetal Fe-Mn monatomic electrocatalyst, a preparation and application thereof. The electrocatalyst takes Fe and Mn bimetals as active components, wherein the Feand Mn bimetals are respectively dispersed on the surface of a carbon matrix in a monatomic form, and the microstructure of the catalyst is an oxygen-bridged FeN4-O-MnN4 structure. The method comprises the following steps: carrying out surface functionalization on carbon black with a large specific surface area by utilizing concentrated acid, so that certain oxygen-containing functional groups areattached to the surface of the carbon black, and the carbon black is dispersed in an organic solvent; then introducing acetate precursors of two metals, and adding a ligand to carry out spontaneous complexing reaction; adding a certain amount of MgO nano-particles, so that agglomeration of metal in the high-temperature process can be effectively inhibited; and further performing acid treatment toremove MgO so as to obtain the atom-dispersed bimetallic electrocatalyst. The electrocatalyst provided by the invention can improve the metal atom utilization rate of the material and realize high-efficiency oxygen reduction.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and in particular relates to a synthesis method of a non-noble metal bimetallic single-atom electrocatalyst and its application in fuel cells and metal-air battery cathode oxygen reduction reactions. Background technique [0002] Due to the advantages of simple structure, environmental friendliness, high efficiency and wide application range, fuel cells are considered to be the first choice for electric vehicles, stationary power stations and other equipment. As a new type of energy conversion device, metal-air batteries have good application prospects due to their environmental friendliness and high energy conversion efficiency. Among them, the cathodic oxygen reduction (ORR) reaction in acid fuel cells, as a process with relatively slow kinetics, plays a dominant role in the energy storage and conversion process of batteries. Pt-based catalysts are currently the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/9041H01M4/9083Y02E60/50
Inventor 石川蔡慧珠陈冰冰尹浦年
Owner DALIAN UNIV OF TECH
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