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A method for preparing single-atom cluster fe-n co-doped single-walled carbon nanotube electrocatalytic thin film 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 Solve problems such as solvents, achieve excellent charge and discharge performance, ensure electrical conductivity, and achieve high purity

Active Publication Date: 2022-07-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • 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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  • A method for preparing single-atom cluster fe-n co-doped single-walled carbon nanotube electrocatalytic thin film electrode
  • A method for preparing single-atom cluster fe-n co-doped single-walled carbon nanotube electrocatalytic thin film electrode
  • A method for preparing single-atom cluster fe-n co-doped single-walled carbon nanotube electrocatalytic thin film electrode

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Effect test

Embodiment 1

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

[0042] 1. If figure 2 As shown, high-purity single-walled carbon nanotube films were prepared by floating catalyst chemical vapor deposition method, and by adjusting the collection time, single-walled carbon nanotube films with a thickness of 250 μm and a G / D ratio of 120 were obtained; 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 conducive to the transport of substances during the reaction process. From the TEM pictures, it can be seen that the Fe nanoparticle catalyst used to grow carbon nanotubes is embedded in the tube bundle by the carbon layer. The single-walled carbon nanotube...

Embodiment 2

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

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

[0049] (2) The same as step 2 in Example 1, the oxygen reduction performance test was carried out on the treated single-walled carbon nanotube film. The resulting oxygen reduction curve E j...

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, and by adjusting the collection time, a single-walled carbon nanotube film with a thickness of 500 μm was obtained. The single-walled carbon nanotube thin film was subjected to gas phase treatment using the same fluorination and ammonia treatment methods as in Example 1. The fluorination temperature was 220 °C for 18 h, and the fluorine / carbon molar ratio of the fluorinated carbon nanotube films was 25.4%. The ammoniation temperature was 750 °C, the time was 2 h, the ammonia gas flow was 200 sccm, and the nitrogen / carbon molar ratio in the carbon nanotube films was 5.6% after ammonia treatment.

[0053] (2) The same as step 2 in Example 1, the oxygen reduction performance test was carried out on the treated single-walled carbon nanotube film. The resulting oxygen reduction curve E j = -3 mA / c...

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Abstract

The invention relates to the field of oxygen reduction reaction catalysis of a fuel cell cathode, in particular to a method for preparing a single-atom cluster Fe-N co-doped single-wall carbon nanotube electrocatalytic thin film electrode. First, the high-performance single-walled carbon nanotube films were subjected to fluorination and ammoniation treatment; during the ammoniation process, the unstable doped fluorine atoms volatilized and left vacancies, which promoted nitrogen atom doping and catalytic growth of single-walled carbon. Fe atoms in the Fe particles of the nanotubes chelate to form high-concentration, single-atom clusters Fe-N chelating active sites. The prepared Fe-N co-doped, self-supporting single-walled carbon nanotube film is used as the catalytic layer, the foamed nickel current collector is used as the positive electrode, the zinc metal plate is used as the negative electrode, and the carbon cloth is used as the gas diffusion layer to form a zinc-air battery, which is Shows excellent performance. The invention does not have any liquid phase reaction, the process is simple, and the advantages of flexibility and self-support of the carbon nanotube film are maintained, and the constructed electrocatalytic 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, in particular to a method for preparing a single-atom cluster Fe-N co-doped single-walled carbon nanotube electrocatalytic thin film electrode, and a zinc-air battery assembled therefrom. Has excellent charge-discharge performance and stability. Background technique [0002] With the depletion of fossil energy and the increasingly serious environmental pollution problems, the development of new energy devices (such as metal-air batteries Zn-Air, fuel cells, etc.) has received more and more attention. Currently, lithium-ion batteries are the most widely used secondary batteries, but due to their theoretical energy density (400 Wh kg -1 ) and actual energy density (200~250 Wh kg -1 ) is low, limiting its application in high-energy-density devices such as electric vehicles. In contrast, metal-air batteries have higher energy density an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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