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Preparation method of metal organic framework material based oxygen evolution catalyst

A metal-organic framework and catalyst technology, applied in the field of oxygen evolution catalysts, can solve the problems that need to be further improved and the catalytic activity needs to be further improved, and achieve good self-supporting ability, convenient industrial production, and simple methods

Active Publication Date: 2019-08-02
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Preparation method of metal organic framework material based oxygen evolution catalyst
  • Preparation method of metal organic framework material based oxygen evolution catalyst
  • Preparation method of metal organic framework material based oxygen evolution catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1, prepare the nitrogen nitrogen dimethyl formamide 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, transfer the mixed solution In the 100 milliliter reactor;

[0029] Step 2, immersing the washed nickel foam into the above-mentioned mixed solution, and reacting with water at 150° C. for 15 hours;

[0030] In step 3, the foamed nickel with the metal-organic framework material grown is washed with water and dried in vacuum. The three-electrode system was then assembled. The above-mentioned nickel foam was used as the working electrode, Ag / AgCl was used as the reference electrode, and Pt was used as the counter electrode, and a constant current deposition experiment was carried out. Electrolyte is 50mmol / L nickel chloride, 1mol / L thiourea mixed solution. The deposition current density is 1mA cm -2 , and the deposition time was 25 minutes.

[0...

Embodiment 2

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

Embodiment 3

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

[0038] In the 1mol / L KOH electrolyte, the oxygen evolution reaction is carried out. Depend on image 3 It can be seen that the electrodeposition time is 25 minutes, and the sample reaches 100mA cm -2 The current density required is only 298mV. For Example 2 and Example 3, to achieve the same current density, the required overpotentials are 316mV and 326mV 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 current density is carried out constant current experiment, and reaction carries out 40 hours, and overpotential does not change almost, illustrates that embodiment 1 has excellent catalytic stability.

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Abstract

The invention discloses a preparation method of a metal organic framework material based oxygen evolution catalyst. The method grows a metal organic framework material MIL-53(Fe) with a lamellar structure on foamed nickel through a simple hydrothermal method, and then a three-electrode system is used to deposit a layer of Ni-S film on the surface of the MIL-53(Fe). The method is simple, the cost of the raw material is low, the method is favorable for the industrial production, and the metal organic framework MIL-53(Fe) / Ni-S composite catalyst is effectively controlled to be synthesized under the relatively mild condition. The catalyst has a better self-supporting capability, meanwhile, the oxygen evolution activity is efficient, and the catalytic stability is relatively good.

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 a metal organic framework material. 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. During the use of these batteries, the oxygen evolution reaction is an important step reaction. The oxygen evolution reaction is a reaction involving the transfer of four electrons that occurs at the anode. It 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 catalysts with efficient oxygen evolution reaction. [0003] Traditional oxygen evolution catalysts such as RuO 2 , Ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J31/22C25B1/04C25B11/06
CPCB01J31/28B01J31/2239C25B1/04C25B11/04B01J2531/842B01J35/33Y02E60/36
Inventor 姜炜吴方郭小雪郝嘎子胡玉冰
Owner NANJING UNIV OF SCI & TECH
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