Universal method for preparing metal nitrogen-carbon catalyst material and application of metal nitrogen-carbon catalyst material

A carbon catalyst and metal nitrogen technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of manpower and material resources, complex preparation methods, and difficult control of preparation process conditions. The effect of convenience, wide source of raw materials, and abundant catalytic active sites

Pending Publication Date: 2021-11-09
INTELLIGENT MFG INST OF HFUT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, metal nitrogen carbon materials have become a high-performance catalyst that can replace noble metal catalysts, and their catalytic activity is close to or even higher than that of noble metals. The preparation methods of metal-type metal nitrogen-carbon materials are also different, which makes the preparation process conditions difficult to control. There is no general process method that can realize the industrialization of the production of metal nitrogen-carbon materials.

Method used

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  • Universal method for preparing metal nitrogen-carbon catalyst material and application of metal nitrogen-carbon catalyst material
  • Universal method for preparing metal nitrogen-carbon catalyst material and application of metal nitrogen-carbon catalyst material
  • Universal method for preparing metal nitrogen-carbon catalyst material and application of metal nitrogen-carbon catalyst material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment prepares the metal nitrogen carbon catalyst material according to the following steps:

[0031] 1) Add 5 g of citric acid monohydrate and 5 g of ammonium chloride into 15 mL of deionized water, sonicate for 10 min, stir at room temperature for 3 h, evaporate the solvent at 70 °C, and dry at 60 °C for 24 h; the obtained product is calcined at 1000 °C for 3 h under argon, A porous nitrogen-carbon material (NC) was obtained.

[0032] 2) Add 14mg of cobalt nitrate hexahydrate into 25mL of ultrapure water, then add 20mg of NC, and sonicate for 1h. Subsequently, an aqueous solution of sodium borohydride (25 mL, 0.25 mol / L) was added dropwise to the mixture, and after the addition was completed, the stirring reaction at room temperature was continued for 12 h; Dry for 12 hours.

[0033] 3) The product obtained in step 2) was calcined at 600° C. for 3 h under argon to obtain the target product metal cobalt nitrogen carbon composite material (Co@NC).

Embodiment 2

[0035] In this example, the metal nitrogen carbon catalyst material was prepared according to the same method as in Example 1, except that the inorganic metal salt cobalt nitrate in step 2) was replaced with nickel nitrate to obtain a metal nickel nitrogen carbon composite material (Ni@NC).

Embodiment 3

[0037] This embodiment prepares the metal nitrogen carbon catalyst material according to the same method as in Example 1, the difference is only: the inorganic metal salt cobalt nitrate in step 2) is replaced with a mixture of cobalt nitrate and nickel nitrate (the molar ratio of the two is 1: 1) to obtain metal cobalt nickel nitrogen carbon composite material (CoNi@NC).

[0038] figure 1 It is the XRD comparison diagram of the metal nitrogen carbon materials prepared in Examples 1-3. It can be seen from the figure that Co@NC, Ni@NC and CoNi@NC composites were successfully prepared.

[0039] figure 2 It is the XPS comparison diagram of the metal nitrogen carbon materials prepared in Examples 1-3. It can be seen from the figure that metal elements exist in the corresponding composite materials.

[0040] image 3 The scanning electron micrograph ( image 3 (a)) and transmission electron micrographs ( image 3 (b)). It can be seen from the figure that the cobalt-nickel m...

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Abstract

The invention discloses a universal method for preparing a metal nitrogen-carbon catalyst material and application of the metal nitrogen-carbon catalyst material. According to the invention, metal salt and porous nitrogen-carbon are used as raw materials, the catalyst material with excellent ORR and OER catalytic activity is obtained through dipping reduction and calcination treatment, and the catalyst material can be used as an excellent bifunctional catalyst of a metal-air battery. The method disclosed by the invention has universality, can be used for synthesizing various metal nitrogen-carbon catalysts, such as Co-coated NC, Ni-coated NC, Mo-coated NC, Ir-coated NC and bimetallic CoNi-coated NC, is simple and convenient to operate, does not need complicated and expensive experimental equipment, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a general method for preparing a metal nitrogen carbon catalyst material and its application. Background technique [0002] With the depletion of non-renewable resources such as petroleum, metal-air batteries are one of the most promising energy storage systems in the future. Compared with traditional lithium-ion batteries, metal-air batteries have attracted widespread attention due to their simple structure, environmental friendliness, and ultrahigh theoretical energy density. However, the development of metal-air batteries still faces many problems, such as short cycle life, poor rate performance, and excessive overvoltage. Among them, noble metals are usually used as cathode catalysts for metal-air batteries, which can catalyze oxygen reactions to greatly reduce overvoltage and improve battery cycle performance, but their shortcomings such as scarcity of reserves, high price, poor st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10H01M4/90H01M4/92
CPCB01J27/24B01J35/0033B01J35/10B01J35/1004H01M4/9041H01M4/9083H01M4/921H01M4/926H01M2004/8689Y02E60/50
Inventor 张大伟汪晓敏罗浩
Owner INTELLIGENT MFG INST OF HFUT
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