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Nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst based on zif-8 and its preparation method and application

A ZIF-8, electrocatalyst technology, applied in the field of electrochemical catalysis, can solve problems such as stability and catalytic activity to be improved, and achieve the effects of easy purchase and preparation, good catalytic activity, and good methanol tolerance

Active Publication Date: 2022-05-17
青岛鸿硅高沃新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, metal species (oxide or simple substance) and nitrogen co-doped carbon (M-N-C) are the most likely materials to replace noble metal-based electrocatalysts, and Fe-N-C has shown excellent ORR catalytic activity in both alkaline and acidic environments. , and bimetallic catalysts (NiFe, CoFe, etc.) due to the synergistic effect of the two metal active components, the carbon-based catalysts formed have better HER and OER performance, but the stability and catalytic activity still need to be improved

Method used

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  • Nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst based on zif-8 and its preparation method and application
  • Nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst based on zif-8 and its preparation method and application
  • Nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst based on zif-8 and its preparation method and application

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preparation example Construction

[0042] The invention provides a method for preparing the electrocatalyst described in the above technical solution, comprising the following steps:

[0043] (1) Mix nickel foam and ferric salt in an organic solvent to undergo a redox reaction to obtain a redox product system;

[0044] (2) Mix the redox product system with zinc salt and 2-methylimidazole, and perform a hydrothermal reaction to obtain a NiFeZn-ZIF precursor;

[0045] (3) Carbonizing the NiFeZn-ZIF precursor to obtain the electrocatalyst.

[0046] The invention mixes the nickel foam and the ferric salt in an organic solvent to generate a redox reaction to obtain a redox product system.

[0047] In the present invention, the size of the nickel foam is preferably 2cm×1cm~0.5cm×1cm, more preferably 1cm×1cm; the nickel foam is preferably obtained by soaking commercially available nickel foam in acid, and the acid is preferably 3 mol / L hydrochloric acid solution; the acid soaking treatment is preferably carried out ...

Embodiment 1

[0069] (1) Preparation of NiFeZn-ZIF

[0070] Take 5 commercially available nickel foams of 1cm×1cm and place them in a 3mol / L hydrochloric acid solution for 10 minutes of ultrasonication, take them out after ultrasonication, wash with deionized water and methanol three times and place them in a beaker; weigh 0.2g Fe(NO 3 ) 3 9H 2 O was placed in the above beaker, 30mL of methanol was added, stirred at 35°C for 2h; 1.2g of Zn(NO 3 ) 2 ·6H 2 O was placed in the above system and continued to stir to obtain a trimetallic solution; then 5.2g of 2-methylimidazole was weighed and dissolved in 40mL of methanol, and the resulting 2-methylimidazole solution was added dropwise to the above-mentioned metal at a rate of 22 μL / s. solution, and continue to stir for 0.5h. After the stirring is completed, transfer the solution to the reaction kettle, react at 150°C for 6h, centrifuge and wash with methanol three times, and vacuum-dry at 60°C for 24h. The obtained brownish-yellow solid is ...

Embodiment 2

[0074] The preparation method is basically the same as in Example 1, except that Fe(NO 3 ) 3 9H 2 The amount of O added was 0.6 g.

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Abstract

The invention provides a ZIF-8-based nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst and its preparation method and application, belonging to the technical field of electrochemical catalysis. The invention provides a ZIF-8-based nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst, which has a core-shell structure, and the core layer is composed of nanoparticles containing iron and nickel elements, and is composed of nitrogen-doped carbon materials Shell. The electrocatalyst provided by the present invention has a core-shell structure, which can accelerate the electron transfer efficiency of the reaction process; the doping of iron, nickel and nitrogen changes the electronic structure and morphology of the carbon material, and improves the conductivity and catalytic performance of the catalyst. Therefore, the electrocatalyst provided by the present invention exhibits excellent multifunctional electrocatalytic performance, has good methanol tolerance and cycle stability, and has potential application value in technologies such as fuel cells and electrolyzed water.

Description

technical field [0001] The invention relates to the technical field of electrochemical catalysis, in particular to a ZIF-8-based nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst and its preparation method and application. Background technique [0002] Energy technologies such as fuel cells, metal-air batteries, and electrolyzed water have attracted widespread attention due to their high-efficiency energy conversion and environmental friendliness. Oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are used It is used in the key electrode process of various sustainable energy technologies, but these three processes have the problem of slow kinetics. At present, the catalysts for ORR and HER reactions are mainly Pt and its alloys, and the catalysts for OER reactions are mainly IrO. 2 and RuO 2 , but these noble metals are scarce in nature, so the development of new electrocatalysts plays a vital role i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90C25B11/04C25B1/04B01J27/24B01J35/10B01J35/02B01J35/00
CPCH01M4/9083H01M4/9016C25B1/04B01J27/24B01J35/33B01J35/396B01J35/40B01J35/615C25B11/04H01M4/90B01J23/745B01J31/22B01J23/755B01J27/26B01J35/00B01J35/30B01J35/60
Inventor 詹天荣温永红张朋荣皓庆陈璐瑶王磊祁洪运李智
Owner 青岛鸿硅高沃新材料科技有限公司
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