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Nano zinc sulfide loaded carbon-based oxygen reduction electrocatalyst

A technology of nano-zinc sulfide and electrocatalyst, applied in the field of electrochemistry, to achieve the effect of simple method, easy control and operation

Pending Publication Date: 2021-04-09
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Blow nitrogen into the tube furnace for 30 minutes to ensure nitrogen saturation

Method used

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  • Nano zinc sulfide loaded carbon-based oxygen reduction electrocatalyst
  • Nano zinc sulfide loaded carbon-based oxygen reduction electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) First, dissolve 1.732g of zinc nitrate hexahydrate in 70ml of DMF, and ultrasonically dissolve it completely; then weigh 0.85g of 1-phenyl-5-mercaptotetrazole and slowly add it to the above solution, and Leave it for 5 minutes, and observe that the white precipitate gradually precipitates. Stir sufficiently at room temperature for 8 hours with magnetic force, adjust the rotation speed to 9000rpm and centrifuge for 2 minutes, wash with absolute ethanol three times to obtain a white precipitate, and dry it in vacuum at 60 degrees for 6 hours to obtain a precursor sample.

[0019] (2) Weigh the precursor sample dried in step (1) and put it into the tube furnace. Nitrogen was passed through the tube furnace for 30 minutes to ensure nitrogen saturation. Programmable heating at a heating rate of 10°C per minute to 300°C, constant temperature for 30 minutes, then rising to a high temperature of 1100°C at 10°C per minute, constant temperature carbonization for 2 hours, and ...

Embodiment 2

[0023] (1) First, dissolve 1.732g of zinc nitrate hexahydrate in 70ml of DMF, and ultrasonically dissolve it completely; then weigh 0.85g of 1-phenyl-5-mercaptotetrazole and slowly add it to the above solution, and Leave it for 5 minutes, and observe that the white precipitate gradually precipitates. Stir sufficiently at room temperature for 8 hours with magnetic force, adjust the rotation speed to 9000rpm and centrifuge for 2 minutes, wash with absolute ethanol three times to obtain a white precipitate, and dry it in vacuum at 60 degrees for 6 hours to obtain a precursor sample.

[0024] (2) Weigh the precursor sample dried in step (1) and put it into the tube furnace. Nitrogen was passed through the tube furnace for 30 minutes to ensure nitrogen saturation. Programmable heating at a heating rate of 10°C per minute to 300°C, constant temperature for 30 minutes, then rising to a high temperature of 1000°C at 10°C per minute, constant temperature carbonization for 2 hours, and ...

Embodiment 3

[0028] (1) First, dissolve 1.732g of zinc nitrate hexahydrate in 70ml of DMF, and ultrasonically dissolve it completely; then weigh 0.85g of 1-phenyl-5-mercaptotetrazole and slowly add it to the above solution, and Leave it for 5 minutes, and observe that the white precipitate gradually precipitates. Stir sufficiently at room temperature for 8 hours with magnetic force, adjust the rotation speed to 9000rpm and centrifuge for 2 minutes, wash with absolute ethanol three times to obtain a white precipitate, and dry it in vacuum at 60 degrees for 6 hours to obtain a precursor sample.

[0029] (2) Weigh the precursor sample dried in step (1) and put it into the tube furnace. Nitrogen was passed through the tube furnace for 30 minutes to ensure nitrogen saturation. Programmable heating at a heating rate of 10°C per minute to 300°C, constant temperature for 30 minutes, then rising to a high temperature of 900°C at 10°C per minute, constant temperature carbonization for 2 hours, progr...

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Abstract

The invention discloses a preparation method of an electrocatalytic oxygen reduction (ORR) electrocatalyst. With the reaction temperature controlled, the reaction degree of the carbon thermal reaction of zinc sulfide can be induced, so that the size and content of the zinc sulfide and the density of carbon defects generated by the carbon thermal reaction can be regulated and controlled, and therefore, the nano zinc sulfide loaded defect-based carbon nano electro-catalytic material can be obtained. Compared with other synthesis methods, the method is simple and easy to control. The nano zinc sulfide loaded defect-based carbon nano electro-catalytic material has efficient ORR catalytic performance; and the limiting current density of the material in an alkaline electrolyte solution is -5.3 mA / cm <2>, the half-wave potential of the material is 0.894 V, and the material has excellent oxygen reduction electro-catalytic performance. Researches show that the change of the temperature is beneficial to controlling the degree of the carbon thermal reaction of the zinc sulfide and controlling the growth process of the zinc sulfide, and obtained nano zinc sulfide particles and defect sites can be used as ORR electrocatalytic active centers.

Description

Technical field: [0001] The invention belongs to the field of electrochemistry and relates to an oxygen reduction electrocatalyst. It has high catalytic performance and excellent stability in alkaline electrolyte. Specifically, based on the MOF structure, by controlling the temperature of the carbonization reaction to control the size, content and defect density of nano-zinc sulfide, a nano-zinc sulfide, defect and nitrogen doping synergistic oxygen reduction electrocatalyst was prepared. . [0002] Background of the invention: [0003] Oxygen reduction reaction (ORR) is an important half-reaction in metal-air batteries and fuel cells, and its reaction path involves the transfer of multiple protons and electrons, so the reaction kinetics are slow. At present, the most effective ORR catalysts are Pt-based materials. Although Pt has high reactivity, its resources are limited, its stability is poor, and it also strongly interacts with various gases such as CO, which is easily ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/8825H01M4/8878H01M4/90H01M12/06
Inventor 赵炯鹏刘涛
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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