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A kind of preparation method of oxygen evolution catalyst based on metal organic framework material

A metal-organic framework and catalyst technology, which is applied in the field of oxygen evolution catalysts, can solve the problems that the catalytic activity needs to be further improved and needs to be further improved, and achieve the effects of good oxygen evolution stability, excellent oxygen evolution reaction activity, and simple method

Active Publication Date: 2022-06-21
NANJING UNIV OF SCI & TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, its catalytic activity needs to be further improved
In addition, the performance of oxygen evolution catalytic activity prepared by electrodeposition technology needs to be further improved (ACS Appl. Mater. Interfaces 2017, 9, 31887-31896)

Method used

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  • A kind of preparation method of oxygen evolution catalyst based on metal organic framework material
  • A kind of preparation method of oxygen evolution catalyst based on metal organic framework material
  • A kind of preparation method of oxygen evolution catalyst based on metal organic framework material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1, prepare a nitrogen-nitrogen dimethylformamide solution containing ferric chloride and terephthalic acid, wherein the concentrations of ferric chloride and terephthalic acid are respectively 0.6mmol / L and 0.6mmol / L, and the mixed solution is transferred. into a 100 ml reactor;

[0029] Step 2, immersing the washed nickel foam into the above mixed solution, and performing hydrothermal reaction at 150° C. for 15 hours;

[0030] In step 3, the nickel foam on which the metal organic framework material is grown is rinsed with water and dried in vacuum. The three-electrode system was then assembled. Using the above-mentioned foamed nickel as the working electrode, Ag / AgCl as the reference electrode, and Pt as the counter electrode, galvanostatic deposition experiments were carried out. The electrolyte is 50 mmol / L nickel chloride and 1 mol / L thiourea mixed solution. Deposition current density of 1 mA cm -2 , the deposition time was 25 minutes.

[0031] After the r...

Embodiment 2

[0035] This example is basically the same as Example 1, except that the electrodeposition time is 15 minutes, and other conditions remain the same.

Embodiment 3

[0037] This example is basically the same as Example 1, except that the electrodeposition time is 5 minutes, and other conditions remain the same.

[0038] The oxygen evolution reaction was carried out in 1 mol / L KOH electrolyte. Depend on image 3 It can be seen that the electrodeposition time is 25 min and the sample reaches 100 mA cm -2 , the required overpotential is only 298mV. For Example 2 and Example 3, to achieve the same current density, the required overpotentials were 316 mV and 326 mV, respectively. It shows that the deposition time can affect the oxygen evolution catalytic performance of the final product.

[0039] Depend on Figure 4 It can be seen that at 100mA cm -2 The galvanostatic experiment was carried out at the current density of 1, and the reaction was carried out for 40 hours, and the overpotential hardly changed, indicating that Example 1 has excellent catalytic stability.

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Abstract

The invention discloses a preparation method of an oxygen evolution catalyst based on a metal organic framework material. The method grows metal-organic framework material MIL-53(Fe) with lamellar structure on nickel foam by a simple hydrothermal method, and then uses a three-electrode system to deposit a layer of Ni-S thin film on MIL-53(Fe). . The method of the invention is simple, the raw material cost is low, and is beneficial to industrial production, and the metal-organic framework MIL-53(Fe) / Ni-S composite catalyst is effectively controlled and synthesized under relatively mild conditions. The catalyst has good self-supporting ability, high-efficiency oxygen evolution activity and good catalytic stability.

Description

technical field [0001] The invention belongs to the technical field of oxygen evolution catalysts, and relates to a preparation method of an oxygen evolution catalyst based on metal-organic framework materials. Background technique [0002] With the continuous development of society, the society's demand for energy is increasing. At present, energy storage and conversion devices represented by fuel cells and lithium batteries have received extensive attention. Oxygen evolution reaction is an important step in the use of these batteries. Oxygen evolution reaction is a reaction involving four electron transfer that occurs at the anode, which has a high reaction energy barrier and a slow reaction rate, which seriously restricts the development of new energy technologies. Therefore, it is of great practical significance to develop a catalyst with efficient oxygen evolution reaction. [0003] Traditional oxygen evolution catalysts such as RuO 2 , IrO 2 and other precious met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/22C25B1/04C25B11/054C25B11/061C25B11/095
CPCB01J31/28B01J31/2239B01J35/0033C25B1/04C25B11/04B01J2531/842Y02E60/36
Inventor 姜炜吴方郭小雪郝嘎子胡玉冰
Owner NANJING UNIV OF SCI & TECH
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