Metal-nitrogen carbon material with atomic-scale dispersed metal as well as preparation method and application thereof

A nitrogen-carbon material, atomic-level technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the difficulty of further improvement, low efficiency of metal nitrogen-carbon composite materials, expensive ligand materials, etc. problems, to achieve the effect of simple and easy reaction operation, low cost, low toxicity and high preparation efficiency

Active Publication Date: 2018-04-20
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Overall, the first preparation method is extremely inefficient in obtaining atomically dispersed metal-nitrogen-carbon composites, which largely relies on pre-treatment and strict post-processing to ensure the removal of particulate metal components and the removal of atomic-level metal components. Retention of components, and the acid elution rate is greater than 50%, and the content of atomically dispersed metal components remaining in the metal-nitrogen carbon material is extremely low, us

Method used

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  • Metal-nitrogen carbon material with atomic-scale dispersed metal as well as preparation method and application thereof
  • Metal-nitrogen carbon material with atomic-scale dispersed metal as well as preparation method and application thereof
  • Metal-nitrogen carbon material with atomic-scale dispersed metal as well as preparation method and application thereof

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Embodiment 1-12

[0038] According to the following Table 1, a certain amount of metal salts were dissolved in 30mL formamide, ultrasonically dispersed until transparent, and then placed in a polytetrafluoroethylene reactor with a volume of 40.0mL, at the reaction temperature shown in Table 1 react with time. After the reaction, cool down naturally, take out the solid-liquid mixture, separate the solid and liquid by centrifugation, dry the solid in an oven at 60°C, and collect the dry powder, which is the metal-nitrogen-carbon material precursor in which the metal is dispersed at the atomic level. Wherein the precursor shown in embodiment 1-14 is carried out the mensuration of nitrogen content and metal content and pickling elution rate, wherein with the dilute sulfuric acid of 1mol / L after target product is soaked 2h, measure metal elution rate, result are shown in Table 1.

[0039] Then each precursor is roasted under the protection of argon at the roasting temperature and time shown in Tabl...

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Abstract

The invention provides a metal-nitrogen carbon material precursor with atomic-scale dispersed metal. Based on the total weight of the metal-nitrogen carbon material precursor, the content of N is 25 to 35 weight percent and the content of the metal is 0.1 to 1.3 weight percent, wherein the metal is one or more of transition metal or noble metal. The precursor is formed through self-polymerizing aformamide solution of metal salt. After the precursor is roasted in an inert atmosphere at high temperature, a metal-nitrogen carbon material with the atomic-scale dispersed metal is obtained; based on the total weight of the metal-nitrogen carbon material, the content of the N is 4 to 7 weight percent and the content of the metal is 0.3 to 8 weight percent. The precursor and the metal-nitrogen carbon material can be used as an electrochemical catalyst. A preparation method provided by the invention is simple and easy to operate and has economical cost and the preparation efficiency of the atomic-scale dispersed metal-nitrogen carbon material is high.

Description

technical field [0001] The invention belongs to the field of preparation of new materials, and in particular relates to a metal-nitrogen carbon material in which metal is dispersed at the atomic level, its preparation method and its application. Background technique [0002] Atomic-scale dispersed metal nitrogen-carbon composite materials, because of their excellent catalytic performance, high metal component utilization, anti-pollution and high failure, are used in many important electrochemical reactions of energy conversion, such as oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, and carbon dioxide reduction reaction. There are two classic preparation methods: the first is to mechanically mix metal salts, nitrogen sources, and carbon sources, and after high-temperature roasting, use strong acid to remove metal aggregated particles, and use nitrogen to strongly coordinate transition metals. A small amount of atomically dispersed transiti...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08C25B11/06
CPCB01J27/24B01J37/082C25B11/075
Inventor 孙晓明贾茵张国新
Owner BEIJING UNIV OF CHEM TECH
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