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

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

Active Publication Date: 2019-11-15
BEIJING UNIV OF CHEM TECH
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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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  • A kind of iron, cobalt, nitrogen co-doped carbon catalyst and its preparation method and application
  • A kind of iron, cobalt, nitrogen co-doped carbon catalyst and its preparation method and application
  • A kind of iron, cobalt, nitrogen co-doped carbon catalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0035] Preparation of Fe / Co Bimetallic Zeolite Imidazolate Framework Precursors

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

[0037] Preparation of iron, cobalt and nitrogen co-doped carbon catalysts

[0038] Take 200 mg of the above iron / cobalt bimetallic zeolite imidazolate framework mat...

Embodiment 2

[0040] Using 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 onset potential and half-wave potential of the catalyst are both negative, and the catalytic activity is inferior to that of the catalyst in Example 1.

Embodiment 3

[0042] Using the preparation method of the iron / cobalt bimetallic zeolite imidazolate framework material precursor in Example 1, the only difference is that the addition amount of ferrous sulfate becomes 417 mg, and the addition amount 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 the regular polyhedral structure is no longer maintained.

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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 present 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 oxygen reduction reaction, which has a high energy barrier and a slow kinetic process. High-efficiency catalysts need to be used to reduce the reaction energy barrier to speed up the reaction rate. At present, the commercial catalyst for oxygen reduction reaction is carbon-supported noble metal platinum catalyst (Pt / C), which has high catalytic performance for oxygen reduction. However, the high cost, scarce reserves and poor resistance to methanol poisoning of the precious metal Pt severely limit its large-scale application. Therefore, it is of great significance to research and develop low-cost, high activity and high stability non-noble metal oxygen reduction catalysts. [0003] At present, tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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