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Nd-graphene composite material and preparation method and application thereof

A composite material and graphene technology, applied in the direction of graphene, chemical instruments and methods, metal material coating technology, etc., can solve the problems of difficult application of large-area material production, reduced proton transmission efficiency, poor hydrogen evolution performance, etc., to achieve improved Electrochemical active area, uniform surface morphology, and good electrical conductivity

Active Publication Date: 2021-06-29
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material synthesis cycle is long, the efficiency is low, and it is difficult to apply to the production of large-area materials
[0006] Finally, from the perspective of practical application, most of the existing catalyst materials are powder materials, which require binders during use, which will reduce the proton transport efficiency
In the process of use, some catalyst materials can only be used in acidic environment, and the hydrogen evolution performance in alkaline environment is very poor, which makes its application subject to many restrictions

Method used

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  • Nd-graphene composite material and preparation method and application thereof
  • Nd-graphene composite material and preparation method and application thereof
  • Nd-graphene composite material and preparation method and application thereof

Examples

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preparation example Construction

[0029] The invention provides a kind of preparation method of Nd-graphene composite material, comprises the following steps:

[0030] S1. With nickel foam as the substrate and carbon-containing gas as the carbon source, graphene is grown on the surface of the nickel foam substrate by chemical vapor deposition to obtain a graphene foam nickel material;

[0031] S2. Prepare Nd simple substance on the graphene surface of the graphene foamed nickel material, that is, obtain the Nd-graphene composite material.

[0032] In some embodiments, the preparation of Nd simple substance on the graphene surface of the graphene nickel foam material in S2 specifically includes: placing the graphene foam nickel material in a tube furnace, placing neodymium fluoride powder in the tube furnace and heating to 1200-1400°C, volatilize and decompose neodymium fluoride to produce neodymium-containing simple substances and deposit on the surface of graphene.

[0033] In some embodiments, the preparati...

Embodiment 1

[0048] A kind of preparation method of Nd-graphene composite material, comprises the following steps:

[0049] A1, foam nickel is placed in the ethanol solution of 5% mass concentration and soaks 8min;

[0050] A2, the foamed nickel processed through ethanol is placed in the first temperature zone of the tube furnace, the neodymium fluoride powder is placed in the second temperature zone of the tube furnace, and the hydrogen and argon gas mixture ( The volume ratio of hydrogen to argon is 5:100), raise the temperature of the first temperature zone to 1100°C, raise the temperature of the second temperature zone to 1400°C, and keep it warm for 10 minutes, and then feed ethylene gas with a flow rate of 100 sccm for 10 minutes. Then, both the first temperature zone and the second temperature zone are naturally cooled to room temperature to obtain the Nd-graphene composite material.

[0051] It should be noted that the above-mentioned tube furnace is a conventional tube furnace, a...

Embodiment 2

[0053] The preparation method of the Nd-graphene composite material provided in this example is the same as that in Example 1, except that the temperature in the second temperature zone in this example is 1350°C.

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Abstract

The invention provides an Nd-graphene composite material and a preparation method and application thereof. The preparation method of the composite material comprises the following steps that S1, graphene is grown on the surface of a foamed nickel substrate by using a chemical vapor deposition method to obtain a graphene foamed nickel material; and S2, an Nd elementary substance is prepared on the graphene surface of the graphene foamed nickel material to obtain the Nd-graphene composite material. According to the preparation method, the foamed nickel is adopted as the substrate, the foamed nickel is a conductive 3D porous material which is low in cost and good in performance, the foamed nickel can play a role in a framework when being used as the substrate, graphene stacking can be avoided through the foamed nickel, and graphene can be fully spread; and meanwhile, neodymium in neodymium fluoride is a rare earth element, and due to the unique property of neodymium 4f electrons, the neodymium fluoride is combined with an electrocatalyst, so that the electrochemical catalysis efficiency of hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction and the like is remarkably improved. The material prepared by the invention has a self-supporting structure, and no binder is needed in use.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a Nd-graphene composite material and its preparation method and application. Background technique [0002] Electrocatalytic splitting of water to produce hydrogen and oxygen is a safe and sustainable way to obtain clean energy, which has important application value and research significance in the efficient use of renewable clean energy, alleviating energy crisis and preventing environmental pollution. Currently, the best-performing hydrogen evolution and oxygen evolution catalysts are Pt-based and Ir / Ru-based materials, respectively. The limited reserves and high cost of such noble metal catalytic materials limit their use in large-scale applications. Therefore, it is of great significance to find non-precious metal catalysts with abundant reserves, low cost and excellent performance. [0003] The performance of a catalyst mainly depends on the intrinsic activity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26C23C16/56C01B32/186C01B32/194C25B11/091C25B11/061C25B11/031C25B1/04H01M4/90
CPCC23C16/26C23C16/56C01B32/186C01B32/194C25B1/04H01M4/9041H01M4/9083H01M2004/8689H01M4/90
Inventor 萨格陈丽芳梁彤祥邓义群
Owner JIANGXI UNIV OF SCI & TECH
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