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A high-performance graphene-supported mesoporous nickel-iron alloy electrocatalyst and its preparation method

A nickel-iron alloy, electrocatalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., to achieve good repeatability, inhibition of particle agglomeration, and easy control of preparation parameters Effect

Active Publication Date: 2021-06-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is very difficult to obtain highly uniform mesoporous metals tightly combined with graphene, so the synthesis of mesoporous metal particles / rGO composite nanostructures is extremely challenging.

Method used

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  • A high-performance graphene-supported mesoporous nickel-iron alloy electrocatalyst and its preparation method
  • A high-performance graphene-supported mesoporous nickel-iron alloy electrocatalyst and its preparation method
  • A high-performance graphene-supported mesoporous nickel-iron alloy electrocatalyst and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The preparation method of graphene supported mesoporous nickel-iron alloy, the steps are as follows:

[0023] (1) Using the modified Hummers method, graphene oxide (GO) was synthesized by exfoliating oxidized natural graphite powder. The obtained graphene oxide was repeatedly centrifuged and washed with 5% dilute hydrochloric acid and deionized water until the supernatant was neutral. Graphene oxide was collected by high-speed centrifugation and freeze-dried.

[0024] (2) disperse the graphene oxide obtained in step (1) in tin protochloride (SnCl 2 ) of hydrochloric acid solution (PH ≈ 3.0), mixed and stirred for 10 minutes. After several washes with deionized water, the graphene and SnCl 2 Palladium chloride (PdCl 2 ) hydrochloric acid solution (PH ≈ 3.0), mixed and stirred for 5 minutes. After being washed several times with deionized water, they were collected by centrifugation to obtain graphene oxide-supported mesoporous Pd nanoparticles (Pd / GO). Among them, ...

Embodiment 2

[0031] The preparation method of graphene-supported mesoporous nickel-iron alloy has the same steps as in Example 1, except that the reduction reaction temperature in step (4) is 20° C., and the obtained results are basically the same as in Example 1.

Embodiment 3

[0033] The preparation method of graphene-loaded mesoporous nickel-iron alloy, the steps are the same as in Example 1, the difference is that step (4) NiCl 2 The mass ratio to the reducing agent dimethylamine borane (DMAB) is 1:1, and the obtained results are basically the same as in Example 1.

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Abstract

A high-performance graphene-supported mesoporous nickel-iron alloy electrocatalyst and a preparation method thereof belong to the technical field of graphene-based electrocatalysts. With graphene oxide as the initial support, after Sn 2+ Sensitization and Pd 2+ Activation of graphene oxide supported Pd nanoparticles Pd / GO. Ni source NiCl 2 ·6H 2 O, Fe source FeCl 2 4H 2 O and Pd / GO were dispersed in the lyotropic liquid crystal formed by the surfactant cetyl ethoxylate (Brij 58). Using dimethylamine borane (DMAB) as the reducing agent and the Pd particles on the surface of GO as the nucleation center, Brij58 was removed after the reduction reaction to obtain a graphene-supported mesoporous nickel-iron alloy electrocatalyst. The catalyst combines graphene and mesoporous nanostructures, which is conducive to the rapid transport of electrons and the increase of catalytic active sites, and has high electrocatalytic oxygen evolution performance and excellent stability.

Description

technical field [0001] The invention relates to a preparation method of a graphene-loaded mesoporous nickel-iron alloy composite material electrocatalyst and its application field. The catalyst prepared by the method is particularly suitable for electrocatalytic oxygen evolution reaction, has high activity and high stability, and belongs to the technical field of graphene-based electrocatalysts. Background technique [0002] With the increasing global energy demand, the increasing shortage of traditional fossil fuels and the continuous deterioration of the natural environment, people have conducted extensive research on efficient energy conversion and storage technologies. Electrochemical oxygen evolution reaction (OER), as a half-reaction in water electrolysis and metal-air batteries, has attracted increasing attention and exploration. Due to the slow kinetics of the OER process, it is urgent to develop highly active electrocatalysts to reduce the applied potential for ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J23/89B01J35/02B01J35/10B82Y30/00B82Y40/00C25B1/04C25B11/091B22F1/00B22F9/24
CPCB01J35/0033B01J23/755B01J23/892B01J35/023B01J35/1061B01J35/0013C25B1/04B22F9/24B82Y30/00B82Y40/00C25B11/091B22F1/054Y02E60/36
Inventor 徐联宾张红董静
Owner BEIJING UNIV OF CHEM TECH
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