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Manganese dioxide-carbon nano tube composite catalyst based on palladium single-atom and preparation thereof

A technology of carbon nanotube composite and manganese dioxide, which is applied in the direction of fuel cell half-cells and primary battery half-cells, electrical components, battery electrodes, etc., can solve the problem of low catalyst mass activity and low utilization efficiency of silver atoms, etc. problems, achieve excellent electrocatalytic activity and stability, improve catalytic activity and stability, and increase the effect of quantity

Active Publication Date: 2018-06-15
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the composite catalyst prepared by this method, silver is loaded on the surface of the carrier in the form of particles, the utilization efficiency of silver atoms is low, and the mass activity of the catalyst is low.

Method used

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  • Manganese dioxide-carbon nano tube composite catalyst based on palladium single-atom and preparation thereof
  • Manganese dioxide-carbon nano tube composite catalyst based on palladium single-atom and preparation thereof
  • Manganese dioxide-carbon nano tube composite catalyst based on palladium single-atom and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 11

[0028] Example 1 Preparation of catalyst No. 1

[0029] 1) Add 0.9g of manganese sulfate, 2.6g of ammonium sulfate, and 1.2g of ammonium persulfate to 20mL of ultrapure water, stir electromagnetically to obtain a mixed solution;

[0030] 2) Transfer the mixed solution to a 25mL hydrothermal kettle, put it in an oven at 180℃, and react for 18h. The product is washed and dried to obtain MnO 2 Catalyst (Catalyst No. 1).

Embodiment 2

[0031] Example 2 Preparation of No. 2 Catalyst

[0032] In this embodiment, carbon nanotubes are added on the basis of embodiment 1. The specific preparation steps are as follows:

[0033] 1) Disperse 0.2g carbon nanotubes uniformly in 10mL ultrapure water by ultrasonic to obtain a carbon nanotube suspension;

[0034] 2) Add 0.9g of manganese sulfate, 2.6g of ammonium sulfate, and 1.2g of ammonium persulfate into 10mL of ultrapure water, stir electromagnetically to obtain a mixed solution;

[0035] 3) After the carbon nanotube suspension and the mixed solution are uniformly mixed, they are transferred to a 25mL hydrothermal kettle and placed in an oven at a temperature of 180°C for 18 hours. The product is washed and dried to obtain manganese dioxide-carbon nanotubes Composite catalyst (No. 2 catalyst).

Embodiment 3

[0036] Example 3 Preparation of No. 3 Catalyst

[0037] In this example, noble metal palladium is added on the basis of example 2. The specific preparation steps are as follows:

[0038] 1) Disperse 0.2g carbon nanotubes uniformly in 10mL ultrapure water by ultrasonic to obtain a carbon nanotube suspension;

[0039] 2) Add 0.9g of manganese sulfate, 2.6g of ammonium sulfate, 1.2g of ammonium persulfate and 100mg of palladium nitrate to 10mL of ultrapure water, stir electromagnetically to obtain a mixed solution;

[0040] 3) After the carbon nanotube suspension and the mixed solution are uniformly mixed, they are transferred to a 25mL hydrothermal kettle and placed in an oven at a temperature of 180°C for 18 hours. The product is washed and dried to obtain a palladium monoatom-based dioxide Manganese-carbon nanotube composite catalyst (catalyst 3).

[0041] A spherical aberration electron microscope was used to characterize the atomic structure of the No. 3 catalyst prepared in this exa...

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Abstract

The invention discloses a manganese dioxide-carbon nano tube composite catalyst based on a palladium single-atom. In the catalyst, manganese dioxide and carbon nano tubes mutually wind to form a three-dimensional nanometer structure, and palladium is loaded onto surfaces of the manganese dioxide and the carbon nano tubes in a form of single atoms. The invention also discloses a preparation methodof the catalyst, and application of the catalyst in a metal-air battery capable of being charged and discharged. According to the manganese dioxide-carbon nano tube composite catalyst based on the palladium single-atom provided by the invention, MnO2 is adopted as a base material, appropriate amount of carbon nano tubes are added, the two materials mutually wind to form the three-dimensional nanometer structure, and the loaded palladium single atom is loaded onto the manganese dioxide and the carbon nano tubes, so that the electric conductivity, the catalytic activity and the stability are improved.

Description

Technical field [0001] The invention relates to the field of metal-air batteries, in particular to a palladium monoatom-based manganese dioxide-carbon nanotube composite catalyst, a preparation method of the catalyst and its application in a rechargeable zinc-air battery. Background technique [0002] With the rapid growth of renewable energy, the effective use and conversion of green electric energy has attracted widespread attention. Zinc-air batteries have become one of the ideal candidate technologies for large-scale energy storage due to their high theoretical energy density, stable discharge voltage, long service life, easy preparation, environmental friendliness, and low battery manufacturing costs. [0003] The cyclic charge and discharge of a rechargeable zinc-air battery requires an electrocatalyst to repeatedly catalyze the oxygen reduction reaction and the oxygen evolution reaction. Therefore, the key issue to improve the efficiency (U discharge / U charge) and the numbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/8825H01M4/9016H01M4/9041H01M4/9083H01M12/06Y02E60/10
Inventor 孙予罕向苇凯李小鹏杜福平钱婧
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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