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Preparation method of three-dimensional carbon network loaded FeCo difunctional oxygen catalyst

A catalyst and dual-function technology, which is applied in the field of preparation of three-dimensional carbon network-supported FeCo dual-function oxygen catalyst, can solve the problems of slow reaction kinetics and barriers, and achieve high application value, low cost, and good dual-function oxygen electrocatalysis effect Effect

Active Publication Date: 2020-02-07
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the slow kinetic barriers of cathode oxygen reduction reaction and anode oxygen evolution reaction of rechargeable zinc-air batteries, noble metal Pt-based, Ir-based and Ru-based catalysts are difficult to use on a large scale and they only have a single catalytic performance factor The problem is to provide a preparation method for in-situ generation of carbon nanosheets and carbon nanotube-coated FeCo alloy cross-linked into a three-dimensional carbon network structure bifunctional oxygen catalyst

Method used

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  • Preparation method of three-dimensional carbon network loaded FeCo difunctional oxygen catalyst
  • Preparation method of three-dimensional carbon network loaded FeCo difunctional oxygen catalyst
  • Preparation method of three-dimensional carbon network loaded FeCo difunctional oxygen catalyst

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Embodiment 1

[0049] A preparation method for a three-dimensional crosslinked carbon network structure supported FeCo bifunctional oxygen catalyst, comprising the following steps:

[0050] (1) Precursor preparation Weigh 2 g of urea in a mortar and mix 0.1 mmol (27 mg) FeCl 3 , 0.2mmol (48mg) CoCl 2 dispersed evenly in it. Then weigh 100mg of chitosan and add it and continue physical grinding for about 30min to fully chelate it.

[0051] (2) Sample preparation Put the precursor prepared above in N 2 In the tube furnace in the atmosphere, the temperature was raised to 350°C at 3°C / min, then raised to 800°C at 5°C / min and kept for 2 hours, and finally cooled to 70°C at 3.5°C / min. The obtained product is ground into a fine powder in an agate mortar to obtain the catalytic material.

[0052] Electrode preparation Weigh 2.0 mg of the prepared material and place it in a sample tube, then add 350 μL of distilled water, 150 μL of isopropanol and 10 μL of Nafion solution in sequence, and shake w...

Embodiment 2

[0056] A preparation method for in-situ generation of carbon nanosheets and carbon nanotube-coated FeCo alloy cross-linked into a three-dimensional carbon network structure bifunctional oxygen catalyst, comprising the following steps:

[0057] (1) Precursor Preparation Weigh 2 g of urea in a mortar, add 0.1 mmol (27 mg) FeCl 3 , 0.1mmol (24mg) CoCl 2 (or other combination 0.1mmolFeCl 3 , 0.3 mmol CoCl 2 ; 0.2 mmol FeCl 3 , 0.1 mmol CoCl 2 ; 0.2 mmol FeCl 3 , 0.2 mmol CoCl 2 ;0.3mmolFeCl 3 , 0.1 mmol CoCl 2 ; 0.3 mmol FeCl 3 , 0.3 mmol CoCl 2 ) are uniformly dispersed in it. Then weigh 100mg of chitosan and add it and continue physical grinding for about 30min to fully chelate it.

[0058] (2) Sample preparation Put the precursor prepared above in N 2 In the tube furnace in the atmosphere, the temperature was raised to 350°C at 3°C / min, then raised to 800°C at 5°C / min and kept for 2 hours, and finally cooled to 70°C at 3.5°C / min. The obtained product is ground into...

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Abstract

The invention belongs to the technical field of electrochemical catalyst material synthesis and particularly discloses a preparation method of a three-dimensional carbon network loaded FeCo difunctional oxygen catalyst. According to the method, a three-dimensional carbon netlike structure is constructed according to the property that chitosan is chelated with ferric chloride and cobalt chloride; NH<3> and CN gases (C<2>N<2+>, C<3>N<2+> and C<3>N<3+>) which are generated during urea decomposition in the pyrolysis process are utilized to etch carbon nanosheets generated by the chitosan in situ so as to further prepare N-doped carbon nanosheets; and Fe and Co catalyze urea under a high temperature to form carbon nano tubes, and the carbon nano tubes wrap FeCo alloy to crosslink into a three-dimensional carbon netlike structure which serves as the efficient difunctional oxygen electrocatalyst. Through the method, no solvent is involved, no auxiliary needs to be added, no template is involved, and only a simple pyrolysis mode after physical grinding is needed; and the method is simple in process route, environmentally friendly and low in cost, and the obtained product has a good difunctional oxygen electrocatalytic effect and shows extremely high application value.

Description

technical field [0001] The invention belongs to the technical field of synthesis of electrochemical catalyst materials in energy storage and conversion technology, and relates to the preparation of chitosan and Fe, Co bimetallic chelate precursors and high-temperature pyrolysis to prepare carbon nanosheets and carbon nanotubes coated FeCo The method for alloy cross-linking a three-dimensional network structure bifunctional catalyst is specifically a preparation method for in-situ growth of carbon nanosheets and carbon nanotube-coated FeCo alloy cross-linking into a three-dimensional carbon network structure bifunctional oxygen catalyst. Background technique [0002] Efficient and environmentally friendly energy conversion and storage technologies, such as alkaline fuel cells and rechargeable metal-air batteries, can effectively alleviate the current energy and environmental crises. This is because fuel cells and metal-air batteries have the advantages of high energy density,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J27/24H01M4/90
CPCB01J23/75B01J27/24H01M4/9083H01M4/9041B01J35/398B01J35/33Y02E60/50
Inventor 雷英张丹丹王洪辉黄仁兴刘兴勇
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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