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A kind of ultra-thin carbon-coated amorphous/crystalline heterogeneous nife alloy nanomaterial and its preparation method and application

An alloy nanomaterial, amorphous technology, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problem of not being used to prepare metastable amorphous/crystalline heterophase structure, and achieve excellent OER performance , the effect of improving the electron conduction rate and reducing the cost

Active Publication Date: 2022-06-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the microwave thermal shock method has been used to synthesize a large number of advanced nanomaterials, it has not been used to prepare metastable amorphous / crystalline heterogeneous phase structures

Method used

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  • A kind of ultra-thin carbon-coated amorphous/crystalline heterogeneous nife alloy nanomaterial and its preparation method and application
  • A kind of ultra-thin carbon-coated amorphous/crystalline heterogeneous nife alloy nanomaterial and its preparation method and application
  • A kind of ultra-thin carbon-coated amorphous/crystalline heterogeneous nife alloy nanomaterial and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of ultra-thin carbon-coated amorphous / crystalline hetero-phase NiFe alloy nanomaterials, the preparation diagram is as follows Figure 11 shown, including the following steps:

[0042] 1) Graphene oxide (GO) is prepared by a modified Hummers method, which specifically includes the following steps: firstly take 360 ​​mL of concentrated sulfuric acid, add 40 mL of concentrated phosphoric acid, and then add 3 g of graphite flakes. After stirring evenly, slowly add 18g potassium permanganate, and place it in a stirring water bath at 50°C for 12h; then, after the temperature is cooled to room temperature, add about 400mL ice water and 10mL hydrogen peroxide, settle for 3 times, and then pickle, ethanol, and water in order to Neutral or so; finally, it was dialyzed in pure water for a week to obtain graphene oxide (GO);

[0043] 2) Using the graphene oxide (GO) in step 1) to prepare a GO suspension with a concentration of 2 mg / mL; sonicate 20 mL of the G...

Embodiment 2

[0048] A preparation method of an ultra-thin carbon-coated amorphous / crystalline hetero-phase NiFe alloy nanomaterial, different from Example 1, in step 2), the total amount of Ni and Fe metals is 4.5wt% of the mass of GO.

Embodiment 3

[0050] A preparation method of an ultra-thin carbon-coated amorphous / crystalline hetero-phase NiFe alloy nanomaterial, different from Example 1, in step 2), the total amount of Ni and Fe metals is 15wt% of the mass of GO.

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Abstract

The invention provides an ultra-thin carbon-coated amorphous / crystal heterogeneous phase NiFe alloy nanomaterial and its preparation method and application. The nanomaterial has a core-shell structure, including an amorphous / crystal heterogeneous phase NiFe alloy core and super Thin graphene shell, amorphous / crystalline heterogeneous phase NiFe alloy core composed of amorphous domains and crystalline domains. The preparation method includes the following steps: 1) preparing a solid-state mixed precursor containing graphene oxide GO, nickel salt, and iron salt; 2) sealing the solid-state mixed precursor and initiator in a glass bottle filled with argon, and irradiating with microwaves for 6 ‑15s. The present invention uses graphene oxide and metal salts as precursors to prepare a / c-NiFe-G with amorphous / crystalline heterogeneous phase and core-shell structure by one-step simple, efficient and ultra-fast microwave thermal shock method, and uses for high-efficiency catalysis of OER; the a / c-NiFe-G prepared by the method of the invention has excellent catalytic activity and high stability for OER.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to an ultrathin carbon-coated amorphous / crystalline heterophase NiFe alloy nanomaterial and a preparation method and application thereof. Background technique [0002] The oxygen evolution reaction (OER) plays a crucial role in various renewable energy technologies, such as electrochemical water splitting, rechargeable metal-air batteries, and CO 2 Reduced to chemicals or fuels. However, OER is a complex four-electron coupled reaction, resulting in sluggish kinetics that limit its overall energy efficiency. Therefore, the design of high-performance OER electrocatalysts is crucial. Currently, RuO 2 / IrO 2 Noble metal materials such as metals are considered to be the most efficient OER catalysts, but their scarcity and high cost severely hinder their large-scale applications. Therefore, there is an urgent need to develop high-efficiency, low-cost, and high-stabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/16B22F1/08B22F9/20C25B11/091C25B1/04B82Y40/00B82Y30/00H01M4/90
CPCB22F9/20C25B11/091C25B1/04B82Y40/00B82Y30/00H01M4/9041H01M4/9083Y02E60/36Y02E60/50
Inventor 龚智超叶龚兰费慧龙
Owner HUNAN UNIV
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