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Iron monatomic catalyst, preparation method thereof and application thereof in water electrolysis oxygen evolution reaction

A technology for oxygen evolution reaction and catalyst, which is applied in the direction of electrolysis process, electrolysis components, electrodes, etc., and can solve the problems of controllable adjustment of electronic structure without realizing single atom.

Inactive Publication Date: 2021-09-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current synthesis methods of single-atom catalysts generally have not achieved the controllable adjustment of the electronic structure of single atoms.

Method used

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  • Iron monatomic catalyst, preparation method thereof and application thereof in water electrolysis oxygen evolution reaction
  • Iron monatomic catalyst, preparation method thereof and application thereof in water electrolysis oxygen evolution reaction
  • Iron monatomic catalyst, preparation method thereof and application thereof in water electrolysis oxygen evolution reaction

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preparation example Construction

[0038] The present invention provides a kind of Fe described in above-mentioned technical scheme 1 (OH) x The preparation method of / P-C single-atom catalyst comprises the following steps:

[0039] In the electrolyte solution containing iron salts, the three-electrode system is used for electrochemical deposition, and the porous carbon P-C is used as the working electrode, and the electrochemical deposition is carried out for 4 to 6 times at a voltage of 1.3-1.8V and a scan rate of 5mV / s. Atoms are monodispersely and uniformly deposited onto porous carbon P-C to give Fe 1 (OH) x / P-C single atom catalyst.

[0040]In the present invention, the iron salt is preferably ferric chloride. Potassium hydroxide and water are also included in the electrolyte solution; the mass of the potassium hydroxide and the volume ratio of water are (55~57) mg:(0.9~1.1) mL; the potassium hydroxide and ferric chloride The mass ratio is 55~57:0.01~0.02.

[0041] In the present invention, the por...

Embodiment 1

[0057] (1) Preparation of porous carbon P-C:

[0058] Mix 10.5mg of zirconium tetrachloride, 7.5mg of 2-hydroxyterephthalic acid, 10mL of dimethylformamide, and 1.2mL of acetic acid at room temperature, stir evenly and then sonicate for 30min; then react the liquid at 120°C for 24h, After cooling to room temperature, the obtained product was separated with a centrifuge, and washed three times with a mixture of dimethylformamide and ethanol at a volume ratio of 1:1; then the product was vacuum-dried at 60°C for 12 hours; then The dried white powder was calcined in a tube furnace under the protection of nitrogen, the heating rate was 5°C / min, and the calcining temperature was 700°C. After reaching the calcining temperature, it was kept for 3h, and the nitrogen flow rate was 50sccm; after natural cooling to room temperature, the The obtained black powder was uniformly dispersed into a mixture of 15 mL deionized water and 0.1 mol hydrofluoric acid, and treated under magnetic stirr...

Embodiment 2

[0062] (1) Preparation of porous carbon P-C:

[0063] Mix 11.0mg of zirconium tetrachloride, 8.0mg of 2-hydroxyterephthalic acid, 10.0mL of dimethylformamide, and 1.5mL of acetic acid at room temperature, stir evenly and then sonicate for 45min; then react the liquid at 130°C for 22h , after cooling to room temperature, the obtained product was separated with a centrifuge, and washed 4 times with a mixture of dimethylformamide and ethanol with a volume ratio of 0.8:1.2; then the product was vacuum-dried at 80°C for 12h; then The dried white powder was calcined in a tube furnace under the protection of nitrogen, the heating rate was 5°C / min, the calcining temperature was 720°C, and kept for 3 hours after reaching the calcining temperature, and the nitrogen flow rate was 100 sccm; after cooling to room temperature naturally, Evenly disperse the obtained black powder into a mixture of 20mL deionized water and 0.2mol hydrofluoric acid, and treat it under magnetic stirring for 3h; ...

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Abstract

The invention provides an iron monatomic catalyst, a preparation method thereof and application thereof in water electrolysis oxygen evolution reaction. The catalyst takes an Fe atom as a metal center and porous carbon P-C as a substrate; and the metal center and the substrate are connected through coordinated oxygen. In the catalyst provided by the invention, iron atoms are uniformly and monodispersedly loaded on the porous carbon P-C, the center of an iron monatom is coordinated with six nearest oxygen atoms, and then is connected with the porous carbon P-C through oxygen to form a Fe-O-C chemical bond, so that charge transfer in the reaction process is facilitated; + 3-valent iron is converted into high-valent iron (Fe < 4 + >) in the reaction process, so that the reaction potential barrier is reduced, and the dynamic process of oxygen evolution is accelerated; and the catalyst shows catalytic activity superior to that of a commercial oxygen evolution catalyst iridium oxide, and has good stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to an iron single-atom catalyst, a preparation method thereof and an application in oxygen evolution reaction of electrolyzed water. Background technique [0002] With the depletion of fossil energy and the intensification of environmental problems, it is of great significance to develop clean, efficient, and renewable energy conversion and storage systems. Electrocatalytic hydrolysis driven by renewable electrical energy is an important class of reactions. On the one hand, clean and efficient hydrogen energy can be obtained through the hydrolysis reaction; on the other hand, the oxygen evolution reaction of the anode half-reaction in the hydrolysis reaction is also a half-reaction of other electrochemical catalytic reactions such as carbon dioxide electroreduction, electrochemical synthesis of ammonia, and oxygen reduction. In these electrocatalytic reactions, it is ...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/04
CPCC25B11/091C25B1/04Y02E60/36
Inventor 冯晨张志荣周仕明曾杰
Owner UNIV OF SCI & TECH OF CHINA
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