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a kind of nife 3 n/nf electrochemical catalyst and its preparation method and application

A catalyst and electrochemical technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of poor electronic conductivity of Ni-based catalysts, incapable of large-scale production, and scarce crustal content, etc. problems, to achieve the effect of low raw material cost, easy operation, and improved oxygen evolution performance

Active Publication Date: 2020-04-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, noble metal oxides also have disadvantages, such as high cost and scarce crustal content, which limits their application, making hydrogen production by electrolysis of water impossible for large-scale production
However, the electronic conductivity of a single Ni-based catalyst is not good, so transition metal doping is considered

Method used

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  • a kind of nife <sub>3</sub> n/nf electrochemical catalyst and its preparation method and application
  • a kind of nife <sub>3</sub> n/nf electrochemical catalyst and its preparation method and application
  • a kind of nife <sub>3</sub> n/nf electrochemical catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Acid pretreatment: prepare a 3M hydrochloric acid solution, pour it into a single-necked round-bottomed flask, and put it in an oil bath; cut the foamed nickel into a size of 1×2cm, wash it with deionized water, and put it in In a hydrochloric acid flask, heat to 90°C for 30 minutes, then cool to room temperature and rinse with water;

[0046] (2) Surface oxidation treatment: The foamed nickel pretreated with hydrochloric acid is oxidized in the air for 2 days to keep it in a humid state, the temperature is 30°C, and the air humidity is 85%.

[0047] The morphology of nickel oxide formed on the nickel foam after surface oxidation treatment is as follows figure 1 Shown by figure 1 It can be seen that a thin and uniformly grown nickel oxide layer is formed on the surface of the foamed nickel sheet.

Embodiment 2

[0049] (1) Prepare a 3M hydrochloric acid solution, pour it into a single-neck round-bottomed flask, put it in an oil bath, cut the foamed nickel into a size of 1×2cm, clean it with deionized water, and put it in a flask containing hydrochloric acid In the medium, heated to 90°C for 30 minutes, then cooled to room temperature, and washed with water; the foamed nickel was oxidized in the air for 2 days to keep it in a humid state, the temperature was 30°C, and the air humidity was 85%;

[0050] (2) Prepare 20mL of K with a concentration of 0.02mol / L 4 Fe(CN) 6 Solution, immerse a piece of 1×2cm surface oxidized nickel foam in K 4 Fe(CN) 6 In the solution, add 0.015mol / L trisodium citrate, and use the nickel oxide on the surface of the nickel foam as the nickel source to make the ligand K 4 Fe(CN) 6 Combine the Fe source and the nickel source in the medium, and stand for 6h, 12h, 18h respectively at room temperature to obtain the MOF material (NiFe-PBA / NF);

[0051] The SEM image of t...

Embodiment 3

[0053] (1) Prepare a 3M hydrochloric acid solution, pour it into a single-neck round-bottomed flask, put it in an oil bath, cut the foamed nickel into a size of 1×2cm, clean it with deionized water, and put it in a flask containing hydrochloric acid In the medium, heated to 90°C for 30 minutes, then cooled to room temperature, and washed with water; the foamed nickel was oxidized in the air for 2 days to keep it in a humid state, the temperature was 30°C, and the air humidity was 85%;

[0054] (2) Prepare 20mL K with concentrations of 0.01mol / L, 0.015mol / L, 0.02mol / L 4 Fe(CN) 6 Solution, immerse a piece of 1×2cm surface oxidized nickel foam in K 4 Fe(CN) 6 In the solution, add 0.015mol / L trisodium citrate, and use the nickel oxide on the surface of the nickel foam as the nickel source to make the ligand K 4 Fe(CN) 6 Combine the Fe source and the nickel source in, and let stand at room temperature for 12 hours to obtain the MOF material (NiFe-PBA / NF);

[0055] The SEM image of the Ni...

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Abstract

The invention discloses a NiFe3N / NF electrochemical catalyst and a preparation method and an application thereof. The electrochemical catalyst is derived by treating a dual-MOF (dual-metal-organic framework) with heat, K4Fe(CN)6 is adopted as a ligand, the ligand contains Fe to provide an Fe source, and by combining a complexing agent ligand with central metal Ni, the dual-MOF is formed; in-situ synthesis is carried out on an Ni substrate, not only is the electric conductivity of the Ni substrate utilized, but also the resistance between the MOF and the Ni substrate is decreased by in-situ synthesis, the dual-MOF is synthesized in one step, and the porosity of the MOF is utilized; moreover, after alkali metal salt is utilized for wrapping, the MOF is treated by heat, and thereby the morphology of the MOF is kept. The process of the preparation method disclosed by the invention is simple, the material cost is low, the preparation method is easy to operate, moreover, the repeatability is high, and the prepared NiFe3N / NF electrochemical catalyst is used for electrocatalytic oxygen evolution reaction.

Description

Technical field [0001] The invention belongs to the technical field of electrocatalytic materials, and specifically relates to a NiFe 3 N / NF electrochemical catalyst and its preparation method and application. Background technique [0002] The two major survival challenges facing human beings are energy and environmental issues. With the large-scale exploitation and consumption of fossil fuels, not only has fossil fuels become extremely scarce, but also a series of environmental pollution problems have been brought about. Renewable energy is paying more and more attention, and it has also set off a research climax in energy conversion and storage. [0003] Hydrogen energy, due to its high energy density, high energy conversion efficiency, and environmental friendliness, is regarded as an ideal energy source to alleviate the energy shortage in the future. At present, there are roughly three methods for producing hydrogen in industry: 1. Primary energy conversion, such as coal, petr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCB01J27/24B01J35/0033B01J35/026C25B1/04C25B11/04Y02E60/36
Inventor 王海辉曾艳华丁良鑫
Owner SOUTH CHINA UNIV OF TECH
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