Ultrathin carbon-coated amorphous/crystal heterogeneous phase NiFe alloy nanometer material and preparation method and application thereof

An alloy nanomaterial, amorphous technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that has not been used to prepare metastable amorphous/crystalline heterophase structures, etc. problems, to achieve excellent OER performance, improve electrochemical stability, and increase the effect of exposure

Active Publication Date: 2021-12-07
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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  • Ultrathin carbon-coated amorphous/crystal heterogeneous phase NiFe alloy nanometer material and preparation method and application thereof
  • Ultrathin carbon-coated amorphous/crystal heterogeneous phase NiFe alloy nanometer material and preparation method and application thereof
  • Ultrathin carbon-coated amorphous/crystal heterogeneous phase NiFe alloy nanometer material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of preparation method of ultra-thin carbon coated amorphous / crystal heterogeneous phase NiFe alloy nanomaterial, preparation schematic diagram is as follows Figure 11 As shown, it specifically includes the following steps:

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

[0043] 2) Use graphene oxide (GO) in step 1) to prepare a GO suspension with a concentration of 2 mg / mL; so...

Embodiment 2

[0048] A method for preparing ultra-thin carbon-coated amorphous / crystalline heterogeneous phase NiFe alloy nanomaterials. The difference from Example 1 is that in step 2), the total amount of Ni and Fe metals is 4.5wt% of the GO mass.

Embodiment 3

[0050] A method for preparing ultra-thin carbon-coated amorphous / crystalline heterogeneous phase NiFe alloy nanomaterials. The difference from Example 1 is that in step 2), the total amount of Ni and Fe metals is 15 wt% of the GO mass.

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Abstract

The invention provides an ultrathin carbon-coated amorphous/crystal heterogeneous phase NiFe alloy nanometer material and a preparation method and application thereof. The nanometer material is of a core-shell structure and comprises an amorphous/crystal heterogeneous phase NiFe alloy core and an ultrathin graphene shell, wherein the amorphous/crystal heterogeneous phase NiFe alloy core is composed of an amorphous area and a crystal area. The preparation method comprises the following steps of 1) preparing a solid-state mixed precursor containing graphene oxide GO, nickel salt and iron salt; and 2) sealing the solid-state mixed precursor and an initiator in a glass bottle filled with argon, and carrying out microwave irradiation 6-15 seconds. According to the ultrathin carbon-coated amorphous/crystal heterogeneous phase NiFe alloy nanometer material and the preparation method and application thereof, the graphene oxide and the metal salt are used as precursors, the a/c-NiFe-G with an amorphous/crystal heterogeneous phase and the core-shell structure is prepared through a one-step simple, efficient and ultrafast microwave thermal shock method, and the a/c-NiFe-G is used for efficiently catalyzing an OER; the a/c-NiFe-G prepared by the method has excellent catalytic activity and extremely high stability on the OER.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to an ultrathin carbon-coated amorphous / crystal heterogeneous phase NiFe alloy nanomaterial, a preparation method and application thereof. Background technique [0002] 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 Reduction to chemicals or fuels. However, OER is a complex four-electron coupling reaction, resulting in slow 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 ions are considered to be the most effective OER catalysts, but their scarcity and high cost severely hinder their large-scale applications. Therefore, there is an urgent need to develop efficient, low-cost, and highly stable OER cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/20C25B11/091C25B1/04B82Y40/00B82Y30/00H01M4/90
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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