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Cobalt single-atom catalyst anchored on carbon nanofibers with cobalt atoms and its preparation method and application

A technology of carbon nanofibers and atomic anchors, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as high cost and poor OER catalytic performance, and achieve easy operation, excellent methanol tolerance and stability, The effect of high porosity

Active Publication Date: 2021-08-31
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the high cost of noble metal Pt catalysts in the prior art, the defects and shortcomings of the poor OER catalytic performance of novel single-atom CNFs catalysts, and provide a cobalt single-atom catalyst in which cobalt atoms are anchored on carbon nanofibers. Preparation

Method used

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  • Cobalt single-atom catalyst anchored on carbon nanofibers with cobalt atoms and its preparation method and application
  • Cobalt single-atom catalyst anchored on carbon nanofibers with cobalt atoms and its preparation method and application
  • Cobalt single-atom catalyst anchored on carbon nanofibers with cobalt atoms and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This example provides cobalt single atom Co-N anchored on carbon nanofibers with cobalt atoms 4 The CNFs catalyst is prepared by the following method.

[0053] Weigh 0.1 g of cobalt acetylacetonate, 0.2 g of m-tetraphenylporphine complexing agent and 0.4 g of polyacrylonitrile polymer dissolved in 4 g of N,N-dimethylformamide solvent for external solution, and weigh Take 0.5 g of polyethylene oxide polymer dissolved in 5 g of N,N-dimethylformamide solvent for internal solution.

[0054] The two solutions were vigorously stirred at 70°C for 8 h until they were completely dissolved, and the two viscous solutions were sucked into a syringe to implement the coaxial electrospinning process. During the electrospinning process, the inner diameter and outer diameter of the same spinneret were selected as 0.35 mm and 1.05 mm respectively, and the coaxial spinneret was adjusted so that the distance from the needle of the spinneret to the collector was 12 cm, and kept A voltage ...

Embodiment 2

[0062] This example provides cobalt single atom Co-N anchored on carbon nanofibers with cobalt atoms 4 The CNFs catalyst is prepared by the following method.

[0063] Weigh 0.1 g of cobalt nitrate, 0.1 g of ethylenediaminetetraacetic acid complexing agent and 0.2 g of polyvinylpyrrolidone polymer dissolved in 2 g of isopropanol solvent for external solution, and weigh 0.5 g of polyethylene oxide polymer Dissolve in 2.5 g isopropanol for internal solution.

[0064] The two solutions were vigorously stirred at 80°C for 12 h until they were completely dissolved, and the two viscous solutions were sucked into syringes to implement the coaxial electrospinning process. During the electrospinning process, the inner diameter and outer diameter of the same spinneret were selected as 0.41 mm and 1.25 mm respectively, and the coaxial spinneret was adjusted so that the distance from the needle of the spinneret to the collector was 10 cm, and kept A voltage of 20 kV was applied while con...

Embodiment 3

[0068] This example provides cobalt single atom Co-N anchored on carbon nanofibers with cobalt atoms 4 The CNFs catalyst is prepared by the following method.

[0069] Weigh 0.1 g of cobalt chloride, 0.15 g of o-phenanthroline complexing agent and 0.3 g of styrene-acrylonitrile copolymer polymer dissolved in 3 g of dichloromethane solvent for external solution, while weighing 0.5 g of poly Acrylonitrile polymer was dissolved in 3 g of dichloromethane solvent for internal solution.

[0070] The two solutions were vigorously stirred at 90°C for 12 h until they were completely dissolved, and the two viscous solutions were sucked into syringes to implement the coaxial electrospinning process. During the electrospinning process, the inner diameter and outer diameter of the same spinneret were selected as 0.45 mm and 1.35 mm respectively, and the coaxial spinneret was adjusted so that the distance from the needle of the spinneret to the collector was 15 cm, and kept A voltage of 25...

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Abstract

The invention relates to a cobalt single-atom catalyst in which cobalt atoms are anchored on carbon nanofibers, a preparation method and application thereof. The preparation method includes the following steps: S1: dissolving cobalt source, complexing agent and nitrogen-containing polymer in a solvent to obtain an external solution; dissolving a soluble polymer in a solvent to obtain an internal solution; S2: using a coaxial electrostatic wire Spinning the external solution and the internal solution to obtain the as-spun fiber; S3: After removing the soluble polymer in the spun fiber, calcining at 500-1000°C for 2-5 hours at a high temperature to obtain the cobalt single-atom catalyst. The cobalt single-atom catalyst prepared by the electrostatic spinning technology and high-temperature calcination has the advantages of small diameter, small pore size, high porosity, good fiber uniformity, etc., and has good ORR and OER catalytic performance, excellent methanol resistance Acceptability and stability, can be widely used in fuel cells, metal-air batteries. The preparation method provided by the invention has simple process and is easy to operate.

Description

technical field [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a cobalt single-atom catalyst in which cobalt atoms are anchored on carbon nanofibers, and a preparation method and application thereof. Background technique [0002] Oxygen reduction reaction (ORR) and oxygen evolution (OER), usually catalyzed by noble metal Pt, are important reactions for clean energy production, such as metal-air batteries and fuel cells. However, the scarcity and high cost of platinum severely limit its commercial application. A class of catalysts has been developed to replace noble metal Pt catalysts, including transition metal ions stabilized by nitrogen functional groups on the surface of carbon supports, including pyrolytic and non-pyrolytic nitrogen-containing metal complexes. For pyrolyzed nitrogen-containing metal complexes, they are usually prepared by heat-treating appropriate transition metal sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCH01M4/9041H01M4/9083Y02E60/50
Inventor 沐杨昌王乃光施志聪黄新月吴淮峰
Owner GUANGDONG UNIV OF TECH
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