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Method for preparing monoatomic cluster Fe-N co-doped single-walled carbon nanotube electro-catalytic membrane electrode

A technology of single-walled carbon nanotubes and carbon nanotube films, applied in the field of preparing single-atom cluster Fe-N co-doped single-walled carbon nanotube electrocatalytic thin film electrodes, can solve the problem of carbon nanotube-based electrocatalysts relying on organic bonding Agents and other issues, to achieve the effect of excellent performance, simple process

Active Publication Date: 2020-10-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to develop a simple and efficient method for preparing single-atom cluster Fe-N co-doped single-walled carbon nanotube electrocatalytic thin film electrodes. During the preparation process, the single-walled carbon The structural integrity of nanotube films solves the problem of carbon nanotube-based electrocatalysts relying on organic binders; and uses them to assemble efficient and stable zinc-air batteries

Method used

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  • Method for preparing monoatomic cluster Fe-N co-doped single-walled carbon nanotube electro-catalytic membrane electrode
  • Method for preparing monoatomic cluster Fe-N co-doped single-walled carbon nanotube electro-catalytic membrane electrode
  • Method for preparing monoatomic cluster Fe-N co-doped single-walled carbon nanotube electro-catalytic membrane electrode

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Embodiment 1

[0041] In this embodiment, the method for preparing a monoatomic cluster Fe-N co-doped single-walled carbon nanotube electrocatalytic thin film electrode comprises the following steps:

[0042] 1. If figure 2 As shown, a high-purity single-walled carbon nanotube film was prepared by floating catalyst chemical vapor deposition, and a single-walled carbon nanotube film with a thickness of 250 microns and a G / D ratio of 120 was obtained by adjusting the collection time; It can be seen that the single-walled carbon nanotubes are mainly intertwined in the form of tube bundles to form a self-supporting carbon nanotube film, and a large number of microporous structures are formed between the intertwined tube bundles, which is beneficial to the material transport during the reaction process. From the transmission electron microscope photos, it can be seen that the Fe nanoparticle catalyst used to grow carbon nanotubes is covered by carbon layers and embedded in the tube bundles. The...

Embodiment 2

[0047] In this embodiment, the difference from Embodiment 1 is:

[0048] (1) Using the same preparation and collection method of the single-wall carbon nanotube film as in Example 1, by adjusting the collection time, a single-wall carbon nanotube film with a thickness of 100 microns was obtained. Using the same fluorination and ammoniation treatment methods as in Example 1, the single-walled carbon nanotube film was subjected to gas phase treatment. The fluorination temperature is 150° C. and the time is 6 hours, and the fluorine / carbon molar ratio of the fluorinated carbon nanotube film is 14.9%. The ammoniation temperature is 700° C., the time is 0.5 h, the flow rate of ammonia gas is 50 sccm, and after ammonia treatment, the molar ratio of nitrogen / carbon in the carbon nanotube film is 3.3%.

[0049] (2) Same as Step 2 of Example 1, the oxygen reduction performance test was carried out on the treated single-walled carbon nanotube film. The obtained oxygen reduction curve ...

Embodiment 3

[0051] In this embodiment, the difference from Embodiment 1 is:

[0052] (1) Using the same preparation and collection method of the single-walled carbon nanotube film as in Example 1, by adjusting the collection time, a single-walled carbon nanotube film with a thickness of 500 microns was obtained. Using the same fluorination and ammoniation treatment methods as in Example 1, the single-walled carbon nanotube film was subjected to gas phase treatment. The fluorination temperature is 220° C., the time is 18 hours, and the fluorine / carbon molar ratio of the fluorinated carbon nanotube film is 25.4%. The ammoniation temperature was 750° C., the time was 2 hours, and the flow rate of ammonia gas was 200 sccm. After ammonia gas treatment, the molar ratio of nitrogen / carbon in the carbon nanotube film was 5.6%.

[0053] (2) Same as Step 2 of Example 1, the oxygen reduction performance test was carried out on the treated single-walled carbon nanotube film. The obtained oxygen red...

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Abstract

The invention relates to the field of fuel cell cathode oxygen reduction reaction catalysis, in particular to a method for preparing a monoatomic cluster Fe-N co-doped single-walled carbon nanotube electro-catalytic membrane electrode. The preparation method comprises the following steps: firstly, carrying out fluorination and ammoniation treatment on a high-performance single-walled carbon nanotube film; in the ammoniation process, unstable doped fluorine atoms volatilize, vacancies are left, nitrogen atom doping and chelation with Fe atoms in Fe particles for catalytic growth of the single-walled carbon nanotubes are promoted, and high-concentration single-atom cluster Fe-N chelation active sites are formed. The prepared Fe-N co-doped self-supporting single-walled carbon nanotube film isused as a catalyst layer, a foamed nickel current collector is used as a positive electrode, a zinc metal plate is used as a negative electrode, and carbon cloth is used as a gas diffusion layer to prepare the zinc-air battery, and the zinc-air battery shows excellent performance. According to the invention, no liquid phase reaction is carried out, the process is simple, the advantages of flexibility, self-support and the like of the carbon nanotube film are maintained, and the constructed electro-catalytic film electrode has excellent catalytic activity and stability.

Description

technical field [0001] The invention relates to the field of energy storage and conversion devices such as fuel cells and zinc-air batteries, and specifically relates to a method for preparing single-atom cluster Fe-N co-doped single-wall carbon nanotube electrocatalytic thin film electrodes, and a zinc-air battery assembled therefrom It has excellent charge and discharge performance and stability. Background technique [0002] With the depletion of fossil energy and the increasingly serious environmental pollution, the development of new energy devices (such as: metal-air battery Zn-Air, fuel cells, etc.) has received more and more attention. At present, lithium-ion batteries are the most widely used secondary batteries, but due to their theoretical energy density (400Wh kg -1 ) and actual energy density (200~250Wh kg -1 ) is low, which limits its application in high energy density devices such as electric vehicles. In contrast, metal-air batteries have higher energy den...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/88H01M12/08B82Y40/00B82Y30/00
CPCH01M4/96H01M4/8867H01M4/8878H01M12/08B82Y30/00B82Y40/00
Inventor 侯鹏翔孟育刘畅成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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