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Method for preparing carbon catalyst based on carbon template-induced Fe-N growth and carbon catalyst

A carbon catalyst and carbon template technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low catalyst activity and limited application, and achieve favorable fixation and protection, good conductivity, and rich pore structure. Effect

Active Publication Date: 2018-02-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Researchers have tried various methods to improve the oxygen reduction catalytic activity of Fe and N co-doped carbon catalysts, including changing the type and amount of Fe and N precursors, optimizing material synthesis conditions, constructing various nanostructures and composite materials, Measures such as effective post-treatment, and the use of various characterization techniques are expected to explain the intrinsic relationship between catalyst activity and structure and components, but the problem of low activity of this type of catalyst has not been effectively resolved, which limits the ability of Fe and N to co-exist. Further Applications of Doped Carbon Catalysts

Method used

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  • Method for preparing carbon catalyst based on carbon template-induced Fe-N growth and carbon catalyst
  • Method for preparing carbon catalyst based on carbon template-induced Fe-N growth and carbon catalyst
  • Method for preparing carbon catalyst based on carbon template-induced Fe-N growth and carbon catalyst

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Experimental program
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Effect test

Embodiment 1

[0050] 1) Preparation of Fe, N co-doped carbon catalyst without carbon template:

[0051] Weigh a certain mass of melamine and FeSO 4 ·7H 2 O powder, dispersed in water (ethanol can be added to promote dissolution), after mixing thoroughly, the catalyst precursor powder is obtained by rotary evaporation or ultrasonic heating, and placed in a tube furnace under the protection of high-purity argon inert atmosphere , pyrolyzed at 900°C for 1 h to obtain a black Fe, N co-doped carbon catalyst.

[0052] 2) Catalyst species composition and content characterization:

[0053] Combining multiple characterization techniques to analyze the composition of the catalyst prepared without carbon templates: in the XRD curve, there are obvious characteristic peaks of elemental Fe and Fe carbides, and at the same time, some weak Fe-N x Species characteristic peaks. The XPS results show that the N content is about 4.5 at%, which is composed of pyridine N, pyrrole N, graphite N and "N-O" types...

Embodiment 2

[0059] 1) Preparation of Fe and N co-doped carbon catalysts when carbon particles are used as carbon templates:

[0060] An aqueous solution of Vulcan XC-72 carbon particles was wet ball milled and freeze-dried, and the resulting powder was added to melamine and FeSO 4 ·7H 2 In the aqueous dispersion of O (can be added with ethanol to promote dissolution), after fully mixing, the catalyst precursor powder is obtained by rotary evaporation or ultrasonic heating, and it is placed in a tube furnace under the protection of a high-purity argon inert atmosphere. , pyrolyzed at 900°C for 1 h to obtain a black Fe, N co-doped carbon catalyst. The process of carbon template-induced active site growth is as follows: figure 2 As shown, the TEM spectrum of the catalyst is shown as image 3 shown.

[0061] 2) Catalyst species composition and content characterization:

[0062] Combining multiple characterization techniques to conduct an in-depth analysis of the composition of catalysts...

Embodiment 3

[0069] 1) Preparation of Fe, N co-doped carbon catalyst when graphene is used as carbon template:

[0070] An aqueous solution of graphene was wet ball milled and then freeze-dried, and the resulting powder was added to melamine and FeSO 4 ·7H 2 In the aqueous dispersion of O (can be added with ethanol to promote dissolution), after fully mixing, the catalyst precursor powder is obtained by rotary evaporation or ultrasonic heating, and it is placed in a tube furnace under the protection of a high-purity argon inert atmosphere. , pyrolyzed at 900°C for 1 h to obtain a black Fe, N co-doped carbon catalyst.

[0071] 2) Catalyst species composition and content characterization:

[0072] In-depth analysis of the composition of catalysts prepared when graphene was used as a carbon template by combining multiple characterization techniques: some Fe-N x The characteristic peaks of species, no characteristic peak signals of elemental Fe and Fe carbides. The XPS results show that th...

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Abstract

The invention relates to a method for preparing a carbon catalyst based on carbon template-induced Fe-N growth and the carbon catalyst. The preparation method of the catalyst comprises the following steps of 1) dispersing a carbon material into a solvent A, and then performing wet ball milling, freezing and drying to obtain a carbon template; 2) dissolving a Fe compound and an N compound into a solvent B, and then adding the carbon template, performing uniform mixing and drying to obtain a catalyst precursor; and 3) performing high-temperature pyrolysis on the catalyst precursor in gas atmosphere to obtain the Fe and N co-doped carbon catalyst. Compared with the prior art, the preparation method disclosed in the invention can suppress generation of non-active or weak active metal Fe particles, Fe carbide and the like by virtue of introduction of the carbon template, so as to promote conversion of the metal Fe particles, Fe carbide and the like to strong active Fe-N<x> species to inducegrowth of Fe-N<x> strong active sites and the like; and in addition, interaction can be generated between the carbon template and the Fe-N<x> active sites and the like, so that the electronic structure can be regulated and enhancement of the inherent activity can be improved.

Description

technical field [0001] The invention belongs to the technical field of clean energy, and relates to a method for preparing a carbon catalyst by inducing Fe-N growth with a carbon template and the carbon catalyst. Background technique [0002] Clean energy technologies such as fuel cells and metal-air batteries have attracted widespread attention from all over the world, and the oxygen reduction reaction involved is the core of the electrochemical reaction process. At present, Pt and its alloy catalysts are still the most widely used oxygen reduction catalysts, but the reserves of Pt in nature are scarce, which cannot meet the future market demand in the field of new energy. Therefore, high-performance non-noble metal catalysts have become one of the research directions. [0003] A large number of research works have shown that Fe and N co-doped carbon materials are a class of non-noble metal catalysts with great potential, which can be used to replace Pt-based catalysts. R...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/9083Y02E60/50
Inventor 张世明原鲜霞马紫峰
Owner SHANGHAI JIAO TONG UNIV
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