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A kind of cobalt-iron alloy, nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application

A cobalt-iron alloy and catalyst technology, applied in the field of cobalt-iron alloy, nitrogen co-doped carbon oxygen reduction catalyst and preparation thereof, can solve problems such as poor catalytic performance and burial, and achieve the effects of ensuring stability, sufficient reaction, and promoting uniform dispersion

Active Publication Date: 2022-03-04
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the active sites of transition metal and nitrogen atom co-doped carbon-based catalysts are buried by carbon materials and have poor catalytic performance, thereby providing a cobalt-iron alloy, nitrogen co-doped Doped Carbon Oxygen Reduction Catalyst

Method used

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  • A kind of cobalt-iron alloy, nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application
  • A kind of cobalt-iron alloy, nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application
  • A kind of cobalt-iron alloy, nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Using ZIF-8@Fe, Co-ZIF as precursor high temperature pyrolytic carbonization to prepare iron, nitrogen co-doped carbon oxygen reduction catalyst, including the following steps:

[0048] (1) Zn(NO 3 ) 2 ·6H 2 O (5.45mmol, 1.62g) and dimethylimidazole (12.8mmol, 1.052g) were respectively dissolved in methanol solvent saturated with nitrogen, ultrasonically dissolved and dispersed evenly, and the above two solutions were fully mixed under stirring conditions, and then in Insulated at 30°C for 12h, after suction filtration, washing and drying, a white powder ZIF-8 was obtained; among them, Zn(NO 3 ) 2 ·6H 2 The molar ratio of O to dimethylimidazole is 1:2.35, the drying temperature is 80°C, and the drying time is 12h;

[0049] (2) Dissolve ZIF-8 (160mg) and dimethylimidazole (9.6mmol, 788.2mg) in 160mL and 20mL of methanol solvent respectively, the metal mixed salt FeSO 4 ·7H 2 O(0.3mmol, 83.4mg) and Co(NO 3 ) 2 ·7H 2 O (0.3mmol, 87.3mg) was dissolved in 20mL meth...

Embodiment 2

[0060] The preparation process was similar to that of Example 1, except that the Fe / Co molar ratio was reduced to 1:5 during the preparation of the precursor ZIF-8@Fe,Co-ZIF.

[0061] Transmission electron microscope analysis was carried out to the obtained catalyst, such as Figure 8 As shown, the cobalt-iron alloy on the surface of the NC@CoFe prepared by pyrolytic carbonization prepared in this example, N-CNP is uniformly dispersed on the surface, and the particles grow to about 20nm. Catalyst is carried out oxygen reduction performance test, and test method is with embodiment 1, specifically as Figure 9 As shown, it is shown that the catalyst has an electrocatalytic activity better than commercial 20% Pt / C (Johnson Matthey Company), and the half-wave potential exceeds 6mV, which is about 14mV lower than that in Example 1.

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Abstract

The invention relates to a cobalt-iron alloy and nitrogen co-doped carbon oxygen reduction catalyst. The precursor of the catalyst is a core-shell structure, wherein the core of the precursor is a material with pore-forming and supporting functions, and the shell of the precursor is Fe, Co-ZIF, the shell of the catalyst is an iron-cobalt alloy. The core of the precursor as a support can ensure the stability of the core-shell structure and avoid the problem of catalyst active sites being embedded due to the collapse of the structure during the pyrolysis process. The hierarchical pore structure that is favorable for mass transfer can also promote the uniform dispersion of metal ions in the shell during the pyrolysis process; the shell uses the synergistic catalytic effect of CoFe alloy and active site N to greatly improve the catalytic activity of oxygen reduction; bimetallic iron Co-doped with cobalt and co-doped with nitrogen in the ZIF shell, the metal and nitrogen are spaced apart, which can promote the uniform dispersion of metal particles after high temperature pyrolysis.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a cobalt-iron alloy, nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application. Background technique [0002] The excessive consumption of fossil fuels and the ensuing environmental pollution problems are becoming more and more serious, and the development of energy storage and conversion technologies is the key to solving the problems. Energy storage and conversion technologies, including water electrolysis, metal-air batteries, and fuel cells, etc., have attracted extensive attention due to zero pollution. Among them, fuel cells are considered to be one of the most potential energy conversion devices in the fields of mobile power sources and stationary power generation due to their high conversion efficiency and good stability. However, the fuel cell cathode oxygen reduction reaction has a high energy barrier, and a two-electron reaction usually occ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M8/083
CPCH01M4/8657H01M4/9041H01M4/9075H01M4/88H01M8/083H01M2004/8684Y02E60/50
Inventor 郭志远刘少名胡晓宋洁许可叶青徐桂芝邓占锋叶俊高运兴
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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