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NiFe3N/NF electrochemical catalyst and preparation method and application thereof

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

Active Publication Date: 2017-09-15
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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  • NiFe3N/NF electrochemical catalyst and preparation method and application thereof
  • NiFe3N/NF electrochemical catalyst and preparation method and application thereof
  • NiFe3N/NF electrochemical catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0046] (2) Surface oxidation treatment: The nickel foam after hydrochloric acid pretreatment is oxidized in the air for 2 days to keep it in a wet state at a temperature of 30°C and an air humidity of 85%.

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

Embodiment 2

[0049] (1) Prepare a hydrochloric acid solution with a concentration of 3 M, pour it into a single-necked round-bottomed flask, put it into an oil bath, cut the nickel foam into a size of 1×2 cm, clean it with deionized water, and put it into a flask filled with hydrochloric acid. In the flask, heat to 90°C for 30 minutes, then cool to room temperature and clean with water; the nickel foam is oxidized in the air for 2 days to keep it in a wet state, the temperature is 30°C, and the air humidity is 85%;

[0050] (2) Prepare 20 mL of K with a concentration of 0.02 mol / 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 The Fe source in the mixture was combined with the nickel source, and the MOF material (NiFe-PBA / NF) was obtained by standing at room temperature for 6h, 12h,...

Embodiment 3

[0053] (1) Prepare a hydrochloric acid solution with a concentration of 3 M, pour it into a single-necked round-bottomed flask, put it into an oil bath, cut the nickel foam into a size of 1×2 cm, clean it with deionized water, and put it into a flask filled with hydrochloric acid. In the flask, heat to 90°C for 30 minutes, then cool to room temperature and clean with water; the nickel foam is oxidized in the air for 2 days to keep it in a wet state, the temperature is 30°C, and the air humidity is 85%;

[0054] (2) Prepare 20mL of K with concentrations of 0.01mol / L, 0.015mol / L, and 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 the trisodium citrate of 0.015mol / L, take the nickel oxide on the surface of the nickel foam as the nickel source to make the ligand K 4 Fe(CN) 6 The Fe source and the nickel source in the mixture were combined, and the MOF material (NiFe-PBA / NF) was obtained by standing at r...

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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, in particular to a NiFe 3 N / NF electrochemical catalyst and its preparation method and application. Background technique [0002] Now the two major survival challenges that mankind is facing are energy and environmental issues. With the massive exploitation and consumption of fossil fuels, not only the extreme shortage of fossil fuels has been caused, but also a series of environmental pollution problems. The attention of renewable energy is getting higher and higher, which has also set off a research climax in energy conversion and storage. [0003] Hydrogen energy, because of its high energy density, high energy conversion efficiency, and environmental friendliness, is regarded as an ideal energy source to alleviate future energy shortages. At present, there are roughly three methods for producing hydrogen in industry: 1. Primary energy conversion, such as coal, oil, and na...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J35/50B01J35/33Y02E60/36
Inventor 王海辉曾艳华丁良鑫
Owner SOUTH CHINA UNIV OF TECH
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