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Iron-nickel metal monatomic water electrolysis catalyst and preparation method thereof

A catalyst, water electrolysis technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve the problem of low activity, etc., achieve low cost, easy molding, excellent The effect of electrolytic water catalytic performance

Pending Publication Date: 2021-12-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a preparation method of an iron-nickel metal single-atom electrolysis water catalyst to solve the problem of low activity of transition metal single-atom catalysts in the HER reaction in the prior art

Method used

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  • Iron-nickel metal monatomic water electrolysis catalyst and preparation method thereof
  • Iron-nickel metal monatomic water electrolysis catalyst and preparation method thereof
  • Iron-nickel metal monatomic water electrolysis catalyst and preparation method thereof

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Embodiment 1

[0038] The preparation method of the FeNi metal single-atom electrolysis water catalyst of the present embodiment comprises the following steps:

[0039] 1) 0.87g nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) and 1.32g sodium citrate are added in 100mL ultrapure water, and ultrasonic dispersion obtains solution A; 0.66g potassium cobaltcyanide (K 3 [Co(CN) 6 ]) was added into 100mL ultrapure water, ultrasonically dispersed to obtain solution B; solution A and solution B were mixed, magnetically stirred for 10min, then left at room temperature for 24h, centrifuged, and the solid was washed 3 times with ultrapure water and ethanol, Metal-organic frameworks (FeNi-MOFs) were obtained by vacuum drying overnight at 60 °C in a vacuum oven.

[0040] 2) Add 330 mg of the metal-organic frameworks (FeNi-MOFs) prepared in step 1) and 166.7 mg of dopamine into the Tris base buffer solution, and react with magnetic stirring for one day, then centrifuge, wash the solid with water, and...

Embodiment 2

[0045] The preparation method of the FeNi metal single-atom electrolysis water catalyst of the present embodiment comprises the following steps:

[0046]1) 0.87g nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 (0) and 1.329g sodium citrate are added in 80mL ultrapure water, and ultrasonic dispersion obtains solution A; 0.5g potassium ferricyanide (K 3 [Fe(CN) 6 ]) was added to 50mL ultrapure water, ultrasonically dispersed for 10min, and completely dissolved to obtain solution B; solution A and solution B were mixed, stirred on a magnetic stirrer, and then left to stand at room temperature for 24h, centrifuged, and used for solid The metal-organic frameworks (FeNi-MOFs) were prepared by washing with ultrapure water and ethanol three times each, and drying in a vacuum oven at 50 °C for one day.

[0047] 2) Annealing the product obtained in step 4) at 800° C. under an argon atmosphere to obtain a FeNi single-atom electrolytic water catalyst.

Embodiment 3

[0049] The preparation method of the FeNi metal single-atom electrolysis water catalyst of the present embodiment comprises the following steps:

[0050] 1) 1.17g nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) and 1.75g ​​sodium citrate are added in 105mL ultrapure water, ultrasonic dispersion obtains solution A; 1.08g potassium ferricyanide (K 3 [Fe(CN) 6 ]) was added into 80mL ultrapure water, ultrasonically dispersed to obtain solution B; solution A and solution B were mixed, stirred on a magnetic stirrer, then left at room temperature for 24 hours, centrifuged, and the solid was washed with ultrapure water and ethanol 3 times, and dried overnight at 55°C in a vacuum oven to obtain metal-organic frameworks (FeNi-MOFs).

[0051] 2) Place the FeNi-MOF / PDA nanocube prepared in step 2) in an ammonia atmosphere, and anneal at 500°C for 2 hours to obtain a hollow nitrogen-doped carbon nanocube (FeNi-NP / NC).

[0052] 3) Add the nitrogen-doped carbon nanocubes prepared in ...

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Abstract

The invention relates to a FeNi metal monatomic water electrolysis catalyst, a preparation method thereof and application thereof in hydrogen production by water electrolysis, and belongs to the technical field of metal monatomic catalysis. The preparation method of the monatomic catalyst with bimetallic sites for metal-air batteries comprises the following steps of: (1) adding an iron-nickel bimetallic organic framework compound and dopamine hydrochloride into an alkaline solution, stirring for 5 hours, and carrying out solid-liquid separation to obtain MOF / PDA nano cubes, the alkaline solution being tris alkali; (2) carrying out annealing treatment on the MOF / PDA nano cubes prepared in the step (1) in an ammonia gas atmosphere; (3) etching the product obtained in the step (2) in an aqueous solution with a certain nitric acid concentration; and (4) annealing the solid sample obtained in the step (3) in a nitrogen atmosphere at 800 DEG C, thereby obtaining the catalyst. A metal-air battery prepared by adopting the metal monatomic catalyst and the preparation method of the metal monatomic catalyst with bimetallic sites has the advantages of higher catalytic efficiency, higher production efficiency, lower cost and good reproducibility compared with similar catalysts.

Description

technical field [0001] The invention relates to a FeNi metal single-atom electrolysis water catalyst, a preparation method thereof, and a metal-air battery, belonging to the technical field of metal single-atom catalysis. Background technique [0002] Energy has always been the main resource for human social activities, and fossil energy has always been the main energy used by human beings. However, its consumption rate is getting faster and faster with the development of human beings, especially its reserves will be exhausted in the next few centuries, and the use of fossil energy will inevitably bring about environmental pollution. Therefore, finding a sustainable and clean energy source that can be replaced has become a top priority. Because hydrogen can release huge energy during combustion and the product is non-toxic and harmless water. Therefore, hydrogen is considered as a sustainable and clean energy. From the perspective of existing scientific and technological ...

Claims

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Application Information

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IPC IPC(8): C25B11/095C25B1/04
CPCB01J27/24B01J23/755B01J37/086C25B1/04B01J35/23B01J35/33Y02E60/36
Inventor 李林林蒋鸿程
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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