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Method for preparing catalyst through polymer-metal complex assisted carbonization MOF technology and obtained catalyst

A technology of metal complexes and catalysts, which is applied in the field of preparation of catalysts by polymer-metal complexes assisted carbonization MOF technology, can solve the problems of performance gap and reduce the utilization rate of Fe source, achieve excellent performance, and suppress the inactive metal particles The effect of simple formation and process

Pending Publication Date: 2021-11-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With FeN 4 Although the Fe-N / C single-atom catalyst with active sites has high activity, its performance is still far behind that of commercial Pt / C
The current common performance optimization method is to increase the content of metal atoms in single-atom catalysts (ie, FeN 4 Active site concentration), however, usually the method of synthesizing Fe-N / C catalysts will use high temperature pyrolysis, only by increasing the concentration of metal Fe source to increase the density of active sites will often lead to a large number of inactive Fe nanoparticles, reducing the Utilization of Fe source, and cumbersome acid etching steps are required to remove Fe nanoparticles to obtain single-atom catalysts

Method used

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  • Method for preparing catalyst through polymer-metal complex assisted carbonization MOF technology and obtained catalyst
  • Method for preparing catalyst through polymer-metal complex assisted carbonization MOF technology and obtained catalyst
  • Method for preparing catalyst through polymer-metal complex assisted carbonization MOF technology and obtained catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 High Exposure Dense FeN 4 Preparation of highly active Fe-N / C catalysts at sites

[0036] A kind of preparation method of Fe-N / C catalyst, comprises the steps:

[0037] (1) 50mL containing 2.23g Zn(NO 3 ) 2 ·6H 2 The methanol solution of O was quickly added to 50 mL of methanol solution containing 2.46 g of 2-methylimidazole, stirred vigorously at room temperature for 5 hours, and the precipitate was obtained by high-speed centrifugation, washed with methanol for three times, and finally vacuum-dried at 60°C to obtain ZIF-8 nanoparticles.

[0038] (2) 200mg ZIF-8 nanoparticles are dispersed in the mixed solution of 30ml water and 30ml ethanol, after ultrasonic 2h, add 15mg dopamine hydrochloride monomer and 12mg poloxamer F127 (Pluronic F127) and stir to obtain dispersion liquid; Add 0.6ml dropwise to the dispersion to make the concentration 50mg ml -1 [Fe(Phen) 3 ] 2+ Ethanol solution, stirred for 30 minutes, added ammonia water to adjust the pH to 8....

Embodiment 2

[0046] Example 2 High Exposure Dense CoN 4 Preparation of highly active Co-N / C catalysts at sites

[0047] A kind of preparation method of highly active Co-N / C catalyst, comprises the steps:

[0048] (1) 50mL containing 2.23g Zn(NO 3 ) 2 ·6H 2 The methanol solution of O was quickly added to 50 mL of methanol solution containing 2.46 g of 2-methylimidazole, stirred vigorously at room temperature for 5 hours, and the precipitate was obtained by high-speed centrifugation, washed with methanol for three times, and finally vacuum-dried at 60°C to obtain ZIF-8 nanoparticles.

[0049] (2) Disperse 200mg of ZIF-8 nanoparticles in a mixture of 30ml of water and 30ml of ethanol. After ultrasonication for 2 hours, add 15mg of dopamine hydrochloride monomer and 12mg of Pluronic F127, and stir to obtain a dispersion; then dropwise add 0.6 ml concentration is 50mg ml -1 [Co(Phen) 3 ] 2+ Ethanol solution, stirred for 30 minutes, added ammonia water to adjust the pH to 8.5, exposed to...

Embodiment 3

[0052] Example 3 High Exposure Dense NiN 4 Preparation of highly active Ni-N / C catalysts at sites

[0053] A kind of preparation method of highly active Ni-N / C catalyst, comprises the steps:

[0054] (1) 50mL containing 2.23g Zn(NO 3 ) 2 ·6H 2 The methanol solution of O was quickly added to 50 mL of methanol solution containing 2.46 g of 2-methylimidazole, stirred vigorously at room temperature for 5 hours, and the precipitate was obtained by high-speed centrifugation, washed with methanol for three times, and finally vacuum-dried at 60°C to obtain ZIF-8 nanoparticles.

[0055] (2) Disperse 200mg of ZIF-8 nanoparticles in a mixture of 30ml of water and 30ml of ethanol. After ultrasonication for 2 hours, add 15mg of dopamine hydrochloride monomer and 12mg of Pluronic F127, and stir to obtain a dispersion; then dropwise add 0.6ml concentration is 50mg ml -1 [Ni(Phen) 3 ] 2+ Ethanol solution, stirred for 30 minutes, added ammonia water to adjust the pH to 8.5, exposed to ...

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Abstract

The invention discloses a method for preparing a catalyst through a polymer-metal complex assisted carbonization MOF technology and the obtained catalyst. The invention firstly discloses a method for preparing the catalyst, and the method comprises the following steps: dispersing ZIF-8 nanoparticles in a mixed solution of water and ethanol, carrying out ultrasonic treatment, adding a dopamine hydrochloride monomer and PluronicF127, and carrying out stirring to obtain a dispersion solution; dropwise adding a [M(Phen)3]2+ ethanol solution into the dispersion liquid, carrying out stirring, adjusting the pH value to 7.5-10.5, and carrying outstirring, centrifuging, washing and drying to obtain a solid substance as a catalyst precursor; performing high-temperature carbonization on the catalyst precursor to obtain an M-N / C catalyst, wherein M is Fe, Co or Ni. The invention further discloses the catalyst obtained by the method. The method for preparing the catalyst is simple and easy to implement, the catalyst with highly exposed dense FeN4 active sites is obtained, and the catalyst has excellent oxygen reduction catalytic performance.

Description

technical field [0001] The invention relates to the field of single-atom electrocatalysis. More specifically, it relates to a method for preparing a catalyst by polymer-metal complex assisted carbonization MOF technology and the resulting catalyst. Background technique [0002] With the progress of human society, global energy consumption is increasing rapidly, and the resulting energy crisis, environmental pollution and climate change are becoming increasingly prominent. It is particularly important to develop clean energy technologies known for zero pollution and high energy conversion efficiency. Among them, the proton exchange membrane fuel cell (PEMFC) can directly convert chemical energy into electrical energy through an electrocatalytic reaction. It has the advantages of low operating temperature, high power density and fast start-up, and has been extensively studied by researchers. However, the cathode oxygen reduction reaction (ORR) kinetics of PEMFC is slow, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8825H01M4/9041H01M4/9083H01M2004/8689Y02E60/50
Inventor 刘栋刘峰张利鹏
Owner BEIJING UNIV OF CHEM TECH
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