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Iron, cobalt and nitrogen codoped carbon catalyst and preparation method and application thereof

A carbon catalyst and co-doping technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of single active site of TM-N-C catalyst, decreased catalytic activity of oxygen reduction, and uneven dispersion of active sites, etc. Achieve the effects of excellent oxygen reduction catalytic activity, good metal nanoparticle dispersion, and excellent mass transfer performance

Active Publication Date: 2017-08-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For TM-N-C catalysts prepared by pyrolysis of monometallic ZIFs (such as ZIF-67) as precursors, the precipitated metal nanoparticles agglomerate seriously, resulting in uneven dispersion of active sites and a decrease in catalytic activity for oxygen reduction.
In addition, the TM-N-C catalyst prepared by pyrolysis of single metal ZIFs has a single active site (generally Co-N x ), the catalytic performance of catalysts in alkaline, especially acidic electrolytes is not ideal

Method used

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  • Iron, cobalt and nitrogen codoped carbon catalyst and preparation method and application thereof
  • Iron, cobalt and nitrogen codoped carbon catalyst and preparation method and application thereof
  • Iron, cobalt and nitrogen codoped carbon catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of Iron / Cobalt Bimetallic Zeolite Imidazolate Framework Precursor

[0036]Weigh 208.5 mg of ferrous sulfate and 654.8 mg of cobalt nitrate and dissolve in 160 mL of methanol, weigh 3.9408 g of 2-methylimidazole and dissolve in 160 mL of methanol. 2 half an hour to remove dissolved O in the solvent 2 , to prevent Fe 2+ be oxidized; pour the above salt solution into 2-methylimidazole solution, stir for 2 min to mix evenly, at 30 o C.N 2 After standing for 12 hours in a protected environment, suction filtration, washing, and at 80 o After drying at C for 8 h, the obtained product was the precursor of iron / cobalt bimetallic zeolite imidazolate framework material (named Fe,Co-ZIF(1:3) according to the feed ratio of Fe and Co).

[0037] Preparation of Iron, Cobalt and Nitrogen Co-doped Carbon Catalysts

[0038] Take 200 mg of the above-mentioned iron / cobalt bimetallic zeolite imidazolate framework material precursor sample powder in a corundum crucible, and h...

Embodiment 2

[0040] Adopting the preparation process of Example 1, the difference is that the addition of ferrous sulfate becomes 139 mg, the addition of cobalt nitrate becomes 727.5 mg, and the prepared catalyst is Fe, Co, N-CNP (1:5) . Compared with the catalyst prepared in Example 1, the catalyst has negative onset potential and half-wave potential, and its catalytic activity is inferior to that of the catalyst in Example 1.

Embodiment 3

[0042] Adopt the preparation method of iron / cobalt bimetallic zeolite imidazolate framework material precursor in Example 1, the only difference is that the addition of ferrous sulfate becomes 417 mg, the addition of cobalt nitrate becomes 436.5 mg, wherein Fe 2+ / Co 2+ The molar ratio is 1:1. At this time, the morphology of the synthesized product has been completely deformed and no longer maintains a regular polyhedron structure.

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Abstract

The invention relates to an iron, cobalt and nitrogen codoped carbon catalyst and a preparation method and application thereof. An iron / cobalt double-metal zeolite imidazate framework material is adopted as a precursor, and the iron, cobalt and nitrogen codoped carbon catalyst is prepared and obtained through high-temperature pyrolysis, wherein the iron / cobalt double-metal zeolite imidazate framework material is prepared by adopting ferrous sulfate, cobalt nitrate and 2-methylimidazole to carry out a self-assembly reaction in a solvent under an oxygen-free environment. The iron, cobalt and nitrogen codoped carbon catalyst prepared in the invention has the advantages that the oxygen reduction catalytic activity, electrochemical stability and methanol poisoning resistance is superior to those of commercial Pt / C, the cost is low, the preparation method is simple and volume production can be realized. The catalyst disclosed by the invention can be widely applied to the fields of fuel batteries, metal-air batteries and the like.

Description

technical field [0001] The invention relates to an iron, cobalt and nitrogen co-doped carbon catalyst, its preparation method and its application in fuel cells and metal-air cells. Background technique [0002] The cathode reaction of fuel cells and metal-air batteries is an oxygen reduction reaction, which has a high energy barrier and a slow kinetic process. High-efficiency catalysts are required to reduce the reaction energy barrier to speed up the reaction rate. At present, the commercialized catalyst for oxygen reduction reaction is carbon-supported noble metal platinum catalyst (Pt / C), which has efficient oxygen reduction catalytic performance. However, the high cost, scarce reserves and poor resistance to methanol poisoning of noble metal Pt severely limit its large-scale application. Therefore, it is of great significance to research and develop non-noble metal oxygen reduction catalysts with low cost, high activity and high stability. [0003] At present, transiti...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9041Y02E60/50
Inventor 窦美玲胡朝文王峰郭志远宋夜吉静
Owner BEIJING UNIV OF CHEM TECH
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