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Nickel-iron-based metal-organic framework materials rich in cyano vacancies, preparation methods and applications

A technology of organic frameworks and framework materials, applied in the field of nanomaterials, can solve problems such as unfavorable large-scale preparation and research of catalytic active sites, multiple structural components, and complex operation processes

Active Publication Date: 2020-05-22
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the complex operation process and multiple structural components of this strategy are not conducive to the actual large-scale preparation and the study of its real catalytic active sites.

Method used

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  • Nickel-iron-based metal-organic framework materials rich in cyano vacancies, preparation methods and applications
  • Nickel-iron-based metal-organic framework materials rich in cyano vacancies, preparation methods and applications
  • Nickel-iron-based metal-organic framework materials rich in cyano vacancies, preparation methods and applications

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preparation example Construction

[0040] The present application also provides a method for preparing the nickel-iron-based metal-organic framework material rich in cyano vacancies, comprising the following steps:

[0041] A) NiMoO 4 The nanorod precursor is mixed with the iron cyanide complex solution, and after the reaction, a nickel-iron-based metal organic framework material is obtained, and the iron cyanide complex solution is potassium ferricyanide solution, sodium ferricyanide solution, ferrous Potassium cyanide solution or sodium ferrocyanide solution;

[0042] B) performing plasma bombardment on the nickel-iron-based metal-framed material to obtain a nickel-iron-based metal-organic framework material rich in cyano vacancies as shown in formula (I),

[0043] m 2 NiFe(CN) 6-x (I);

[0044] Wherein, M is K or Na;

[0045] x ranges from 0 to 0.5 and is not equal to 0.

[0046] In the process of preparing nickel-iron-based metal-organic framework materials rich in cyano vacancies, this application f...

Embodiment 1

[0062] (1)NiMoO 4 Preparation of nanorod precursor: Weigh 2mmol nickel nitrate and 2mmol sodium molybdate, and dissolve them in 17.5ml deionized water respectively; add the above-mentioned nickel nitrate solution into the sodium molybdate solution, and stir for 10 minutes to form a uniform mixed solution; Transfer the mixed solution to a 45ml reaction kettle, put it into a 150°C oven for 6 hours; take out the reaction kettle, find a large amount of precipitation, centrifuge and wash with deionized water and ethanol, and dry in a vacuum oven at 60°C for 12 hours to obtain NiMoO 4 Nanorod precursors;

[0063] (2) Preparation of nickel-iron-based metal-organic framework materials: Dissolve 120 mg of potassium ferrocyanide in 30 mL of deionized water, stir to fully dissolve; dissolve 40 mg of the above-mentioned NiMoO 4 The nanorod precursor was added to the potassium ferrocyanide solution, stirred at room temperature for 3 hours, centrifuged and washed with deionized water and e...

Embodiment 2

[0067] The same preparation method as in Example 1, except that the plasma bombardment time in the above step (3) was changed to 10 min.

[0068] Gained sample is carried out transmission electron microscope analysis, the result sees Figure 5 , The product has a porous rod-like structure with a diameter of 80-140nm. It can be seen that shortening the bombardment time of the plasma does not affect the morphology of the product.

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Abstract

The present invention provides a cyano vacancy-rich nickel iron-based metal organic framework material as shown in formula (I); the application also provides the cyano vacancy-rich nickel iron-based metal organic framework material. The preparation method includes the following steps: A) NiMoO 4 The nanorod precursor is mixed with a cyanide complex solution of iron, and after the reaction, a nickel-iron-based metal organic framework material is obtained. The cyanide complex solution of iron is potassium ferricyanide solution, sodium ferricyanide solution, ferrous iron Potassium cyanide solution or sodium ferrocyanide solution; B) Plasma bombardment of the nickel-iron-based metal framework material to obtain a nickel-iron-based metal organic framework rich in cyano vacancies as shown in formula (I) Material. In the present invention, the nickel-iron-based metal organic framework material rich in cyano vacancies has excellent catalytic electrochemical oxygen production performance.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a nickel-iron-based metal organic framework material rich in cyano vacancies, a preparation method and application thereof. Background technique [0002] Hydrogen is considered to be a clean energy with high energy density and no environmental pollution, which is expected to replace the current fossil energy. Therefore, how to synthesize hydrogen fuel cheaply and on a large scale has become a research hotspot. Hydrogen production by electrolysis of water is a relatively environmentally friendly hydrogen production method, and its main process includes the oxygen evolution reaction at the anode and the hydrogen evolution reaction at the cathode. Reducing the electrolysis potential of the electrolysis reaction can reduce the corresponding cost of hydrogen production. Among them, the oxygen evolution reaction at the anode is a four-electron transfer process, which consumes a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/16C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J31/1691B01J35/33Y02E60/36
Inventor 俞书宏余自友
Owner UNIV OF SCI & TECH OF CHINA
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