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Carbon nanofiber loaded metal monatomic catalyst as well as preparation method and application thereof

A carbon nanofiber and catalyst technology, applied in the field of metal single-atom catalysts and their preparation, can solve problems such as the adverse effects of loaded single atoms, and achieve the effects of inhibiting the shuttle effect, adjusting the electronic structure, and improving the electrochemical performance.

Pending Publication Date: 2022-07-12
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, the technical problem to be solved by the present invention is to overcome the procedural problems caused by the membrane modification methods in the prior art, such as coating and suction filtration, and the adverse effects of the carrier on the loading of single atoms

Method used

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  • Carbon nanofiber loaded metal monatomic catalyst as well as preparation method and application thereof
  • Carbon nanofiber loaded metal monatomic catalyst as well as preparation method and application thereof
  • Carbon nanofiber loaded metal monatomic catalyst as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0052] A metal single-atom catalyst supported by carbon nanofibers and a preparation method thereof, specifically comprising the following steps:

[0053] (1) Configure spinning solution

[0054] 0.2 mM cobalt acetate and 0.8 mM 1,10-phenanthroline were placed in a sample vial, 4 mL of N,N-dimethylformamide was added thereto, and magnetically stirred until a homogeneous complex was formed. 0.4 g of polyacrylonitrile (molecular weight: 150,000) and 0.267 g of polymethyl methacrylate were added thereto, and the mixture was magnetically stirred at 60° C. for 12 hours, and 0.1 g of BP2000 carbon black was added, followed by stirring for 12 hours. Then placed in an ultrasonic cleaner and ultrasonicated for 5 hours to completely disperse to form a uniform spinning solution.

[0055] (2) Electrospinning and preparation of Co@N-PCNFs

[0056] Electrospinning was carried out at a voltage of 17KV, the distance between the needle tip and the drum receiver was 17cm, the spinning flow ra...

Embodiment 2

[0058] A metal single-atom catalyst supported by carbon nanofibers and a preparation method thereof, specifically comprising the following steps:

[0059] Basically the same as Example 1, the difference is that 0.2 mmol / L ferrous chloride and 0.8 mmol / L 1,10-phenanthroline were placed in a sample bottle, 4 mL of N,N-dimethylformamide was added to it, and the magnetic Stir until a homogeneous complex forms. Then add 0.4g polyacrylonitrile and 0.267g polymethyl methacrylate, stir magnetically at 60°C for 12h, add 0.1g BP2000 carbon black, stir for 12h, place in an ultrasonic cleaner, ultrasonicate for 5h until completely dispersed, A homogeneous spinning dope is formed.

Embodiment 3

[0061] A metal single-atom catalyst supported by carbon nanofibers and a preparation method thereof, specifically comprising the following steps:

[0062] Basically the same as Example 1, the difference is that 0.2 mmol / L nickel acetate and 0.8 mmol / L 1,10-phenanthroline were placed in a sample bottle, 4 mL of N,N-dimethylformamide was added to it, and the mixture was stirred magnetically until A homogeneous complex is formed. Then add 0.4g polyacrylonitrile and 0.267g polymethyl methacrylate, stir magnetically at 60°C for 12h, add 0.1g BP2000 carbon black, stir for 12h, place in an ultrasonic cleaner, ultrasonicate for 5h until completely dispersed, A homogeneous spinning dope is formed.

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Abstract

The invention relates to a carbon nanofiber loaded metal monatomic catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. The preparation method comprises the following steps: firstly, dissolving transition metal salt and a metal chelating agent into an organic solvent to obtain a metal precursor solution; adding polyacrylonitrile, a pore-forming agent and conductive carbon black into the metal precursor solution, and reacting to obtain a spinning solution; finally, the spinning solution is subjected to electrostatic spinning, pre-oxidation and carbonization treatment, and the carbon nanofiber loaded metal monatomic catalyst is obtained. The carbon nanofiber loaded metal monatomic catalyst can be used as battery materials such as a positive electrode and a middle layer of a lithium-sulfur battery, shuttling of polysulfide in the lithium-sulfur battery can be relieved, and oxidation-reduction reaction kinetics can be catalyzed and accelerated.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a metal single-atom catalyst supported by carbon nanofibers and a preparation method and application thereof. Background technique [0002] In today's era of intelligence, people are more inclined to light, compact, and long-lasting energy storage devices. Lithium-sulfur batteries came into being. The positive and negative electrodes are sulfur and metal lithium, respectively. After multiple steps of electron gain and loss, the charge and discharge behavior of the battery is completed. Its advantages are embodied in the abundant sulfur reserves and high theoretical specific capacity (1675mAh g -1 ) and high energy density (2600Wh kg -1 ) and other aspects, known as the most promising energy storage device. [0003] However, during the charging and discharging process, lithium polysulfides (LiPSs), an intermediate product produced by lithium-sulfur batteries, cause a severe "...

Claims

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Application Information

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IPC IPC(8): H01M50/483H01M10/052H01M10/42D01F1/10D01F9/22
CPCH01M50/483H01M10/052H01M10/4235D01F9/22D01F1/10Y02E60/10
Inventor 方剑宋贝贝赵浩阅
Owner SUZHOU UNIV
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