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Preparation method of bifunctional atom dispersion iron-nitrogen coordination material catalyst

A technology of atomic dispersion and catalyst, applied in the field of electrocatalysis, can solve the problems of low electrocatalytic current density, unsuitable for large-scale production, and few active sites, and achieve high catalytic efficiency, convenient large-scale production, and simple preparation process.

Inactive Publication Date: 2020-10-30
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

Most metal-doped ZIF materials dominated by noble metals such as Pd, Au, and Ag have good redox active sites, but the production cost is high and it is not suitable for large-scale production
The shortcomings of ZIF materials doped with other elements, such as few active sites, low electrocatalytic current density, and poor coordination ability, restrict the development in the field of electrocatalysis.

Method used

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  • Preparation method of bifunctional atom dispersion iron-nitrogen coordination material catalyst
  • Preparation method of bifunctional atom dispersion iron-nitrogen coordination material catalyst
  • Preparation method of bifunctional atom dispersion iron-nitrogen coordination material catalyst

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preparation example Construction

[0022] A method for preparing a bifunctional atom-dispersed iron-nitrogen coordination material catalyst, the specific steps are as follows:

[0023] The first step is to prepare metal skeleton compound ZIF-8 nanoparticles; at room temperature, Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole were dissolved in methanol, stirred, centrifuged and washed to obtain ZIF-8 nanoparticles.

[0024] The second step is to disperse ZIF-8 nanoparticles in the isopropanol solution of ferric chloride, ultrasonically make it adsorbed evenly, and after a period of magnetic stirring, then centrifugally dry to obtain the catalyst precursor; ZIF-8 nanoparticles take 100 mg , FeCl 3 Take 5 mg, 10 mL of isopropanol, ultrasonic for 2 h, magnetically stirred for 2 h, and dry in a vacuum oven at 60 °C for 5 h.

[0025] In the third step, the catalyst precursor was carbonized at high temperature in a nitrogen atmosphere to obtain the final Fe-N-C catalyst; the heating temperature was 800-900 °C for 2 h, ...

Embodiment 1

[0028] The preparation of the bifunctional atom-dispersed iron-nitrogen coordination material catalyst of the present invention, the specific steps are as follows:

[0029] In the first step, 2.4 g of zinc nitrate hexahydrate and 4.7 g of 2-methylimidazole were dissolved in 100 mL of methanol respectively, and the two were mixed and ultrasonicated for 10 min, then magnetically stirred at room temperature for 12 h;

[0030] In the second step, the final product of the first step was centrifuged at 10,000 r / min for 5 min, washed three times with ethanol, and dried in a vacuum oven at 60°C for 5 h to obtain ZIF-8 nanoparticles.

[0031] The third step is to disperse 100 mg ZIF-8 nanoparticles in 5 mg ferric chloride in isopropanol solution, take 10 mL of isopropanol solution, ultrasonicate for 2 h to make it evenly adsorbed; magnetically stir for 2 h, and centrifugally dry , to obtain the catalyst precursor.

[0032] In the fourth step, the catalyst precursors were heated in a n...

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Abstract

The invention relates to a preparation method of a bifunctional atom dispersion iron-nitrogen coordination material catalyst. The preparation method comprises the following specific steps: step 1, preparing metal framework compound ZIF-8 nanoparticles; 2, dispersing the ZIF-8 nanoparticles in an isopropanol solution of ferric chloride, carrying out ultrasonic treatment to uniformly adsorb the ZIF-8 nanoparticles, carrying out magnetic stirring for a period of time, and carrying out centrifugal drying to obtain a catalyst precursor; and 3, carbonizing the catalyst precursor at high temperaturein a nitrogen atmosphere to obtain the final high-activity Fe-N-C catalyst. The method has the advantages that the process is simple, the raw materials are rich, uniform adsorption of the iron elementin the precursor can be achieved through simple adsorption, high-energy-consumption and high-noise process steps such as ball milling are not needed, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and in particular relates to a preparation method of a bifunctional atom-dispersed iron-nitrogen coordination material catalyst. Background technique [0002] With the increasingly severe energy crisis and environmental pollution, the development of environmentally friendly energy and advanced conversion materials and their preparation methods has become a major challenge in the 21st century. Currently, electrolysis catalysts and their performance are one of the key factors restricting energy conversion. Therefore, the development of cheap, durable and highly efficient catalysts has become the key to today's energy conversion and storage. In recent years, the application of ZIF and its derivatives in electrochemical energy conversion has attracted much attention due to their unique structures and physicochemical properties. Most metal-doped ZIF materials dominated by noble metals such as Pd, Au,...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B11/06C25B1/00
CPCB01J27/24C25B1/00B01J35/33
Inventor 丁晶晶许秋华温珍海次素琴李建权
Owner NANCHANG HANGKONG UNIVERSITY
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