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ZIF-67 zeolite imidazate skeleton-based composite electrocatalyst, preparation method thereof, zinc-air battery positive electrode and zinc-air battery

A technology of ZIF-67 and zeolite imidazolate, applied in the field of electrochemical energy storage, can solve problems such as high cost, and achieve the effect of excellent electrochemical performance and enrichment of catalytic sites

Active Publication Date: 2020-03-27
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high cost of noble metal electrocatalysts and the slow redox kinetics of non-noble metal electrocatalysts are still bottlenecks for the implementation of zinc-air batteries (Advanced Energy Materials, 2019, 9, 1803867)

Method used

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  • ZIF-67 zeolite imidazate skeleton-based composite electrocatalyst, preparation method thereof, zinc-air battery positive electrode and zinc-air battery
  • ZIF-67 zeolite imidazate skeleton-based composite electrocatalyst, preparation method thereof, zinc-air battery positive electrode and zinc-air battery
  • ZIF-67 zeolite imidazate skeleton-based composite electrocatalyst, preparation method thereof, zinc-air battery positive electrode and zinc-air battery

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preparation example Construction

[0022] Some embodiments of the present invention provide a method for preparing a ZIF-67 zeolite imidazolate skeleton-based composite electrocatalyst, which includes: sulfurizing and / or phosphating the carbonized ZIF-67 zeolite imidazolate skeleton under an inert atmosphere . That is, the carbonized ZIF-67 zeolite imidazolate framework is separately subjected to sulfurization treatment or phosphating treatment under an inert atmosphere, or the carbonized ZIF-67 zeolite imidazolate framework is subjected to both sulfurization treatment and phosphating treatment under an inert atmosphere.

[0023] The inventors found that in the prior art, the cost of noble metal electrocatalysts is high, while the redox kinetics of non-noble metal electrocatalysts are slow. Based on this, the inventors improved the composite The performance of the material, the zeolite imidazolate framework formed by periodic structural unit links-67 serves as an in situ composite template, and its tunable pore...

Embodiment 1

[0055] The preparation method of a kind of ZIF-67 zeolite imidazolate skeleton-based composite electrocatalyst provided by this embodiment comprises the following steps:

[0056] (1) make ZIF-67 zeolite imidazolate framework material;

[0057] Under the condition of magnetic stirring, 4mmol Co(NO 3 ) 2 ·6H 2 O was dissolved in 100mL of anhydrous methanol to form a magenta clear solution A; 16mmol 2-methylimidazole was dissolved in the above solution to form a purple solution B, and the solution B continued to be magnetically stirred to a purple emulsion; the prepared emulsion Aged for 24 hours, centrifuged at 3500 rad / min and washed 3 times to obtain a purple paste; dried the prepared purple paste in a blast oven at 60°C for 10 hours, and dried in a vacuum oven at 105°C 6h, ZIF-67 zeolite imidazolate skeleton was prepared;

[0058] (2) Grind the ZIF-67 zeolite imidazolate framework material prepared in step (1) in an agate mortar for 10 min, and anneal at 600 °C for 1 h in...

Embodiment 2

[0068] The preparation method of a kind of ZIF-67 zeolite imidazolate skeleton-based composite electrocatalyst provided by this embodiment comprises the following steps:

[0069] (1) make ZIF-67 zeolite imidazolate framework material;

[0070] Under the condition of magnetic stirring, 4mmol Co(NO 3 ) 2 ·6H 2 O was dissolved in 100mL of anhydrous methanol to form a magenta clear solution A; 16mmol 2-methylimidazole was dissolved in the above solution to form a purple solution B, and the solution B continued to be magnetically stirred to a purple emulsion; the prepared emulsion Aged for 24 hours, centrifuged at 3500 rad / min and washed 3 times to obtain a purple paste; dried the prepared purple paste in a blast oven at 60°C for 10 hours, and dried in a vacuum oven at 105°C 6h, ZIF-67 zeolite imidazolate skeleton was prepared;

[0071] (2) Grind the ZIF-67 zeolite imidazolate framework material prepared in step (1) in an agate mortar for 10 min, and anneal at 600 °C for 1 h in...

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Abstract

The invention relates to the technical field of electrochemical energy storage. The invention specifically discloses a ZIF-67 zeolite imidazate skeleton-based composite electrocatalyst, a preparationmethod thereof, a zinc-air battery positive electrode and a zinc-air battery. The preparation method of the composite electrocatalyst comprises: carrying out vulcanization treatment and / or phosphatingtreatment on a carbonized ZIF-67 zeolite imidazate skeleton in an inert atmosphere. The ZIF-67 zeolite imidazate skeleton-based composite electrocatalyst is prepared by carrying out vulcanization and / or phosphorization on a carbonized ZIF-67 zeolite imidazate skeleton in an inert atmosphere. The heterogeneous synergistic effect between the cobalt compound and the carbon material and the ordered pore structure in the composite material provide rich catalytic sites, so that the efficient bifunctional characteristic of the catalyst is realized; the ZIF-67 zeolite imidazate skeleton-based composite electrocatalyst can be used for a positive electrode of a zinc-air battery, shows excellent electrochemical performance, and provides theoretical basis and technical support for practical application of the zinc-air battery.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a ZIF-67 zeolite imidazolate skeleton-based composite electrocatalyst and a preparation method thereof, a positive electrode of a zinc-air battery and a zinc-air battery. Background technique [0002] A zinc-air battery is a battery that uses oxygen in the air as the positive electrode active material and metal zinc as the negative electrode active material. Its open circuit voltage is about 1.4 to 1.5V. Zinc-air batteries have the advantages of large specific energy, stable discharge voltage, unlimited source of positive active material air, and low price. However, the high cost of noble metal electrocatalysts and the slow redox kinetics of non-noble metal electrocatalysts are still bottlenecks for the implementation of Zn-air batteries (Advanced Energy Materials, 2019, 9, 1803867). Therefore, finding non-noble metal bifunctional electrocatalysts with hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M12/06
CPCH01M4/8605H01M4/9083H01M12/06
Inventor 许冠南徐小龙
Owner UNIVERSITY OF MACAU
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