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Iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalyst as well as preparation method and application thereof

An electrocatalyst, iron-nickel technology, applied in the field of iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalysts and preparations, can solve the problems of inability to fully expose active sites and unfavorable catalytic reactions

Pending Publication Date: 2022-07-22
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been many reports on non-precious metal-based bifunctional catalysts, the active sites are often embedded in the bulk phase of the catalyst, and the full exposure of the active sites cannot be achieved, which is obviously not conducive to efficient catalytic reactions.

Method used

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  • Iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalyst as well as preparation method and application thereof
  • Iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalyst as well as preparation method and application thereof
  • Iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The present embodiment provides a method for preparing an iron-nickel-based Mott-Schottky electrocatalyst, which specifically includes the following steps:

[0055] Preparation of S1, Zn-Ni-ZIF nanocubes

[0056] Dissolve 9.08g of 2-methylimidazole in 140mL of deionized water and stir to form solution A; mix 0.0634g of nickel nitrate hexahydrate, 0.6491g of zinc nitrate hexahydrate and 0.01g of cetyltrimethylammonium bromide (CTAB) was dissolved in 20 mL of deionized water to uniformly form solution B;

[0057] Add solution B to solution A while stirring, and after continuing to stir for a period of time, the solution is allowed to stand in a water bath at 40°C. The resulting precipitate is collected by a centrifuge and washed with deionized water and absolute ethanol. , and then dried to obtain Zn-Ni-ZIF nanocubes;

[0058] Preparation of S2, Zn-Ni-ZIF@Prussian Blue Analog Nanocubes

[0059] Disperse the Zn-Ni-ZIF nanocubes in deionized water at a concentration of 0...

Embodiment 2

[0074] A preparation method of an iron-cobalt-based Mott-Schottky electrocatalyst, comprising the following steps:

[0075] Preparation of S1, Zn-Co-ZIF nanocubes

[0076] Dissolve 2-methylimidazole in deionized water with a concentration of 0.0649 g / mL, stir to form solution A2; dissolve cobalt nitrate hexahydrate, zinc nitrate hexahydrate and CTAB in deionized water, and stir to form solution B2, wherein The concentration of cobalt nitrate hexahydrate in solution B2 is 0.00317g / mL, the concentration of zinc nitrate hexahydrate is 0.0325g / mL, and the concentration of CTAB is 0.0005g / mL;

[0077] Mix solution A2 and solution B2 in a volume ratio of 1:1 under stirring, stir while mixing, stand still in a water bath at 30-60 °C, collect the precipitate by centrifugation, use deionized water and anhydrous Washed with ethanol and dried to obtain Zn-Co-ZIF nanocubes;

[0078] Preparation of S2, Zn-Co-ZIF@Prussian Blue Analog Nanocubes

[0079] Disperse Zn-Co-ZIF nanocubes in dei...

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Abstract

The invention relates to the technical field of catalyst preparation, in particular to an iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly synthesizing a metal organic framework material (Zn-Ni-ZIF or Zn-Co-ZIF) nano cube containing zinc and nickel (or cobalt), and then etching the metal organic framework material (Zn-Ni-ZIF or Zn-Co-ZIF) nano cube by using potassium ferricyanide to form a hollow structure so as to form a Zn-Ni (Co)-ZIF nano cube-Prussian blue analogue core-shell structure; and finally, performing pyrolysis under the atmosphere of nitrogen to form the NiFe-Fe3C (or CoFe-Fe3C) Mott-Schottky electrocatalyst. The catalyst has a typical hollow nanometer box structure, the specific surface area is higher, more active sites exist, nitrogen-doped carbon serving as a main framework of the catalyst has good conductivity, and mass transfer and charge transfer processes of electro-catalytic reaction can be accelerated. The catalyst belongs to a bifunctional catalyst, not only can catalyze an oxygen reduction reaction, but also can drive an oxygen evolution reaction, meets the requirements of a rechargeable zinc-air battery, and shows a potential application prospect to replace a commercial noble metal catalyst.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to an iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalyst and a preparation method and application. Background technique [0002] Reversible zinc-air batteries are inexpensive, environmentally friendly, and have high energy density (1084Wh kg -1 ) and other advantages, it has great potential in the application of portable vehicles and energy storage devices. The core component of the battery is a bifunctional catalyst that drives the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), but it suffers from slow kinetics and poor cycling stability. At present, precious metal-based catalysts are mainly used commercially, such as the use of Pt / C catalysts to catalyze the oxygen reduction reaction, the use of RuO 2 Catalyze the oxygen evolution reaction. However, these noble metal catalysts are expensive, low in natural reserves, and poor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/86H01M12/06
CPCH01M4/8878H01M4/9041H01M4/8657H01M12/06
Inventor 张雷朱启亮
Owner ANHUI UNIV OF SCI & TECH
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