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Preparation for high-activity iron nitrogen carbon catalyst by adopting middle-temperature carbonized metal framework compound pore expanding technology

A technology of iron-nitrogen-carbon catalyst and skeleton compound, which is applied in the field of electrocatalysis, can solve the problems of lack of a clear understanding of coordination changes and structural evolution, and achieve the effects of large-scale production, simple process, and abundant raw materials

Inactive Publication Date: 2018-06-29
BEIHANG UNIV
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Problems solved by technology

Although the Fe-N-C catalysts prepared by pyrolysis have excellent ORR activity, the coordination changes and structural evolution during pyrolysis are still not well understood.

Method used

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  • Preparation for high-activity iron nitrogen carbon catalyst by adopting middle-temperature carbonized metal framework compound pore expanding technology
  • Preparation for high-activity iron nitrogen carbon catalyst by adopting middle-temperature carbonized metal framework compound pore expanding technology
  • Preparation for high-activity iron nitrogen carbon catalyst by adopting middle-temperature carbonized metal framework compound pore expanding technology

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Embodiment 1

[0033] Medium-temperature carbide metal skeleton compound pore expansion technology is used in the preparation of high-activity iron-nitrogen-carbon catalysts. The schematic diagram of the preparation method is as follows figure 1 As shown, it is a three-step strategy of "hole expansion-filling-pyrolysis", and the specific steps are as follows:

[0034] In the first step, 1.47g of Zn(NO 3 ) 2 ·6H 2 O and 1.63 g of 2-methylimidazole were dissolved in 100 ml of anhydrous methanol, stirred at room temperature for 10 h, centrifuged, washed, and dried to obtain ZIF-8 nanoparticles.

[0035] The second step, medium-temperature carbonization: ZIF-8 nanoparticles were ground and placed in a quartz boat, and kept in an argon atmosphere at 650° C. for 1 hour in a tube furnace to obtain medium-temperature carbonized ZIF-8 nanoparticles.

[0036] The pore diameter of ZIF-8 nanoparticles after medium-temperature thermal carbonization is expanded from 1.16 nanometers to 1.3-1.8 nanometer...

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Abstract

The invention discloses preparation for a high-activity iron nitrogen carbon catalyst by adopting a middle-temperature carbonized metal framework compound pore expanding technology and belongs to thetechnical field of electrocatalysis. The preparation comprises the following steps: firstly, dispersing middle-temperature carbonized ZIF-8 nanoparticles into de-ionized water; adding a TPI water solution; carrying out ultrasonic treatment to uniformly adsorb, so as to adsorb [Fe(Phen)3]<2+> with positive charges into an expanded micro-pore to form a range-limited [Fe(Phen)3]<2+>@ZIF precursor; finally, carrying out high-temperature carbonization to obtain the high-activity iron nitrogen carbon catalyst provided by the invention. The high-activity iron nitrogen carbon catalyst is composed of three elements including Fe, N and C; the Fe and the N form a Fe-N4 ligand and the Fe-N4 ligand is embedded into a N-doped C matrix. The preparation disclosed by the invention has the advantages of simple technology, abundant raw materials and convenience for large-scale production. By adopting the preparation disclosed by the invention, an oxygen reduction catalyst with a single FeN4 active site is prepared and has excellent oxygen reduction activity under an acidic condition; the half-wave potential can reach 0.82V; compared with performance of a commercial Pt / C catalyst, the maximum power density of the high-activity iron nitrogen carbon catalyst in a proton exchange membrane fuel cell can reach 800mW cm<-2>.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and relates to a medium-temperature carbonized metal skeleton compound pore-enlarging technology for the preparation of high-activity iron-nitrogen-carbon catalysts. Background technique [0002] As a green and efficient energy conversion device, the proton exchange membrane fuel cell (PEMFC) has the advantages of simple structure, low operating temperature, high power density and fast start-up, and is being widely studied. Substantial progress has been made in the research of proton exchange membrane fuel cells used as automobile power. The cathode oxygen reduction reaction (ORR) of proton exchange membrane fuel cells is highly kinetically inert, requiring a large amount of Pt as a catalyst, and its high price restricts the commercial development of fuel cells. In order to reduce the cost and encourage the wide application of fuel cells, the development of low-cost non-precious metal catalysts t...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041H01M4/9083Y02E60/50
Inventor 刘晓芳万鑫水江澜
Owner BEIHANG UNIV
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