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A two-dimensional zinc single atom/carbon nitrogen composite material and its preparation method and application

A composite material, atomic technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as small pores, loss of active sites, and difficulty in electrolyte diffusion, achieving low cost, high oxygen reduction catalytic activity, and improved catalytic activity. The effect of atom utilization

Active Publication Date: 2021-07-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently reported electrocatalysts prepared by pyrolysis using MOFs as precursors usually have a three-dimensional structure. Due to the small pores and difficult diffusion of the electrolyte, some sites inside the catalyst structure cannot participate in the electrocatalytic process of oxygen reduction, resulting in high activity. locus loss

Method used

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  • A two-dimensional zinc single atom/carbon nitrogen composite material and its preparation method and application
  • A two-dimensional zinc single atom/carbon nitrogen composite material and its preparation method and application
  • A two-dimensional zinc single atom/carbon nitrogen composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (a) Preparation of sheet-like Zn-MOFs (Zn-TCPP)

[0045] Dissolve 0.008g of meso-tetra(4-carboxyphenyl)porphine [meso-Tetra(4-carboxyphenyl)porphine (TCPP)] (0.01mmol) in 1mL of ethanol and 3mL of N,N-dimethylformamide [N , N-Dimethylformamide (DMF)] mixture. At the same time, 0.009g of zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) (0.03mmol), 0.0016g pyrazine (0.02mmol) and 0.04g polyvinylpyrrolidone (PVP) were dissolved in a mixture of 3mL ethanol and 9mL DMF. Under vigorous stirring, the TCPP solution was added dropwise. After stirring evenly, transfer it to a 20mL glass vial with a cover, hydrothermally react in an oven at 80°C for 8 hours, cool to room temperature, centrifuge, wash with ethanol three times, and dry in an oven at 80°C for 2 hours to obtain a purple Zn-TCPP compound;

[0046] (b) Preparation of two-dimensional zinc single atom / carbon nitrogen composite oxygen reduction electrocatalyst Zn / CN

[0047] Get a certain amount of Zn-TCPP compound obtained in ste...

Embodiment 2

[0049] (a) Preparation of sheet-like Zn-MOFs (ZIF)

[0050] Dissolve 0.22 g of 2-methylimidazole in 16 mL of deionized water. At the same time, 0.072g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 0.22g of 1-methylimidazole was dissolved in 4mL of deionized water. With vigorous stirring, the 2-methylimidazole solution was added dropwise. After stirring evenly, transfer it to a 40mL glass bottle with a cover, and conduct a hydrothermal reaction in an oven at 25°C for 6 hours. After the reaction, centrifuge, wash with ethanol three times, and dry in an oven at 80°C for 2 hours to obtain a white ZIF compound;

[0051] (b) Preparation of two-dimensional zinc single atom / carbon nitrogen composite oxygen reduction electrocatalyst Zn / CN

[0052] Get a certain amount of ZIF compound obtained in step (a) and place it in a porcelain boat after being ground, and use an inert gas as a protective gas in a tube furnace with a gas flow rate of 50mL min -1 , 5℃min -1 The heating rate was heated ...

Embodiment 3

[0054] (a) Preparation of sheet-like Zn-MOFs (Zn-bpydc)

[0055] 0.024 g of 2,2'-bipyridine-5,5'-dicarboxylic acid (2,2'-Bipyridine-5,5'-dicarboxylic acid, bpydc) was dissolved in 5 mL of deionized water. At the same time, 0.118g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) Dissolve in 5 mL deionized water. Under vigorous stirring, the 2,2'-bipyridine-5,5'-dicarboxylic acid solution was added dropwise. Stir evenly and transfer to a 50mL reaction kettle, hydrothermally react in an oven at 150°C for 8 hours, cool to room temperature, centrifuge, wash with ethanol three times, and dry in an oven at 80°C for 2 hours to obtain a white Zn-bpydc compound;

[0056] (b) Preparation of two-dimensional zinc single atom / carbon nitrogen composite oxygen reduction electrocatalyst Zn / CN

[0057] Get a certain amount of Zn-bpydc compound obtained in step (a) and place it in a porcelain boat after being ground, use an inert gas as a protective gas in a tube furnace, and the gas flow rate is 50mLmin...

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Abstract

The invention discloses a two-dimensional zinc single atom / carbon nitrogen composite material, a preparation method and application thereof. In the invention, a two-dimensional metal-organic framework compound nanosheet is used as a precursor, and a two-dimensional porous carbon-nitrogen composite oxygen reduction electrocatalyst loaded with zinc single atoms is prepared through high-temperature calcination. The oxygen reduction electrocatalyst described in the present invention uses non-noble metal Zn-N x As an active site, the zinc element is uniformly distributed in the form of a single atom in the material, which effectively improves the utilization rate of the atom, and at the same time reduces the overpotential of the oxygen reduction process in the electrocatalytic reaction, which is beneficial to the development of new electrochemical catalysts and new energy sources. Storage devices have important theoretical and practical significance.

Description

technical field [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a two-dimensional zinc single atom / carbon nitrogen composite material and its preparation method and application in electrocatalytic oxygen reduction reaction. Background technique [0002] With the continuous consumption of fossil energy, scientists are constantly looking for new energy conversion methods and energy storage devices, and the oxygen reduction reaction (ORR) plays a vital role in various energy conversion and storage systems, such as the current Research hotspots: fuel cells and metal-air batteries. Traditional noble metal-supported carbon-based catalysts are difficult to put into large-scale use due to their high cost, so single-atom dispersed transition metal and nitrogen co-doped carbon materials are becoming very promising platinum-free oxygen reduction due to their high activity and low cost. Electrocataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8882H01M4/9041H01M4/9083Y02E60/50
Inventor 刘军枫杨灿韩爱娟
Owner BEIJING UNIV OF CHEM TECH
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