Catalyst with double wrapping structures and preparation method and application of catalyst

A catalyst and double-coated technology, applied in the field of catalysts with double-coated structure and their preparation, can solve the problem of not reaching the performance of precious metal catalysts, and achieve the effects of increasing limit current density, improving catalytic activity, and improving oxygen reduction performance.

Active Publication Date: 2019-05-31
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discharge power density of the catalyst is 170mW/cm 2 ,

Method used

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  • Catalyst with double wrapping structures and preparation method and application of catalyst
  • Catalyst with double wrapping structures and preparation method and application of catalyst
  • Catalyst with double wrapping structures and preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Weigh 12g of nickel nitrate and 28g of cobalt nitrate, add ethanol, magnetically stir for 1-2h, then ultrasonically disperse for 1-2h, transfer to a high-pressure reactor, react at 180°C for 3h, cool, filter, dry, 400 Calcined at ℃ to obtain nickel cobaltate spinel; disperse 16g of nickel cobaltate spinel, 5g of manganese dioxide, and 1.0g of inducer polyethylene oxide in the solvent, stir magnetically for 2h, then ultrasonically disperse for 2h, and dry in an oven at 80°C for 6h , calcined at 500°C to obtain manganese dioxide-coated nickel cobaltate spinel; 20 g of manganese dioxide-coated nickel cobaltate spinel, 4.0 g of graphene, added ethanol to disperse, and added surfactant as dodecyl 1.0 g of sodium benzenesulfonate was dispersed ultrasonically for 10 h, quickly dried under reduced pressure, and vacuum calcined at 700° C. to obtain a double-coated catalyst.

[0057] (2) According to the mass ratio of catalyzer, conductive agent, binding agent and solvent is ...

Embodiment 2

[0060] (1) Weigh 12g of nickel nitrate and 27g of cobalt nitrate, add ethanol, stir magnetically for 1-2h, then ultrasonically disperse for 1-2h, transfer to a high-pressure reactor, react at 150°C for 2h, cool, filter, dry, 600 Calcined at ℃ to obtain nickel cobaltate spinel; disperse 15g of nickel cobaltate spinel, 5g of manganese dioxide, and 1.0g of inducer polyvinylpyrrolidone in the solvent, stir magnetically for 2h, then ultrasonically disperse for 2h, 80 Oven-dried at ℃ for 4 hours, calcined at 500℃ to obtain manganese dioxide-coated nickel cobaltate spinel; 18g of manganese dioxide-coated nickel cobaltate, 4.5g of graphene, added ethanol to disperse, and added surfactant dioctylsuccinate Sodium acid sulfonate 1.0 g, ultrasonically dispersed for 12 h, quickly dried under reduced pressure, and calcined at 600° C. to obtain a double-coated catalyst.

[0061] (2) According to the mass ratio of catalyzer, conductive agent, binding agent and solvent is 6.5%: 9.8%: 12.2%: 71...

Embodiment 3

[0064] (1) Weigh 13g of nickel nitrate and 26g of cobalt nitrate, add ethanol, stir magnetically for 1-2h, then ultrasonically disperse for 1-2h, transfer to autoclave, react at 110°C for 1h, cool, filter, dry, 400 Calcined at ℃ to obtain nickel cobaltate spinel; disperse 25g of nickel cobaltate spinel, 6g of manganese dioxide, and 1.0g of inducer polyethylene oxide in the solvent, magnetically stir for 1h, then ultrasonically disperse for 1h, and dry in an oven at 80°C for 5h , calcined at 500°C to obtain manganese dioxide-coated nickel cobaltate spinel; manganese dioxide-coated nickel cobaltate 28g, carbon nanotubes 5.0g, added ethanol to disperse, added surfactant sulfated castor oil 1.0g, Then ultrasonically disperse for 6 h, quickly dry under reduced pressure, and calcined at 800° C. to obtain a double-coated catalyst.

[0065] (2) According to the mass ratio of catalyzer, conductive agent, binding agent and solvent is 6.5%: 9.8%: 12.2%: 71.5%, take by weighing above-ment...

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Abstract

The invention relates to a catalyst with double wrapping structures and a preparation method and application of the catalyst. The specific surface area of the catalyst is 320-490m2/g; and the catalystcomprises 60-80 parts of spinel, 5-20 parts of a manganese oxide and 10-30 parts of a carbon-contained material by weight. The surface of the spinel type catalyst is wrapped in the manganese oxide, so that the catalytic activity of the spinel catalyst is improved; and then the bulk phase is wrapped in the carbon-contained material to improve the conductivity and achieve good concerted catalysis effect.

Description

technical field [0001] The invention relates to the technical field of metal-air batteries, in particular to a catalyst with a double-coated structure, a preparation method and application thereof. Background technique [0002] With the increasingly scarce fossil fuel reserves and the increasingly serious air pollution, it is imminent for people to find sustainable energy sources. Fuel cells have the advantages of high energy conversion rate and no pollution, and have become a research hotspot in the direction of new energy. Fuel cells include proton exchange membrane fuel cells, solid oxide fuel cells, metal-air fuel cells, and the like. [0003] Metal-air batteries take advantage of the advantages of fuel cells, with oxygen in the air as the cathode and metals (magnesium, aluminum, zinc, etc.) , aluminum, zinc, etc.) react to release electricity. The outstanding advantage of the metal-air battery is its large specific energy. In the alkaline electrolyte solution, the th...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90H01M12/06H01M4/88
Inventor 何益锋刘兆平薛业建董正豪陈玲娟
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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