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Preparation method and application of a carbon-coated nickel airgel material

A carbon-coated nickel and aerogel technology, applied in the field of electrocatalysis, can solve the problems of easy oxidative deactivation of metallic nickel, oxidative deactivation of catalysts, etc.

Active Publication Date: 2021-09-14
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, non-noble metal-based alkaline hydroxide catalysts are mainly concentrated on nickel-based materials, but since metal nickel is easily oxidized and deactivated in the air, solving the problem of catalyst oxidative deactivation while maintaining the exposure of active sites has become an urgent problem to be overcome.

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  • Preparation method and application of a carbon-coated nickel airgel material
  • Preparation method and application of a carbon-coated nickel airgel material
  • Preparation method and application of a carbon-coated nickel airgel material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Add 1.16g of nickel nitrate hexahydrate and 0.51g of cyanuric acid into 60mL of ethanol, ultrasonically disperse for 0.5 hours, then transfer to an 80mL hydrothermal kettle, react at 150°C for 12 hours, and after natural cooling, wash with ethanol and water, respectively. , freeze-dried to obtain the precursor; then heat-treated at 400°C for 0.5 hours in a mixed atmosphere of hydrogen and argon (hydrogen gas fraction is 50%), and collected by cooling to obtain the airgel material Aerogel Ni@C-1. Its XRD pattern is shown in figure 1 , the diffraction peaks in the figure correspond to nickel in the metallic phase. Its SEM topography is shown in figure 2 . Its TEM image is shown in image 3 , the outer layer of the metal is coated with an obvious ultra-thin graphitized carbon layer. In a hydrogen-saturated 0.1M KOH electrolyte solution, the catalytic hydrogen oxidation activity of the material was evaluated by linear sweep voltammetry and a rotating disk electrode (Ф=...

Embodiment 2

[0024] Add 2.32g of nickel nitrate hexahydrate and 0.51g of cyanuric acid into 60mL of ethanol, ultrasonically disperse for 0.5 hours, then transfer to a 80mL hydrothermal kettle, react at 150°C for 12 hours, cool naturally and wash with ethanol and water, respectively , freeze-dried to obtain the precursor; then heat-treated at 400°C for 0.5 hours in a mixed atmosphere of hydrogen and argon (hydrogen gas fraction is 50%), and collected by cooling to obtain the airgel material Aerogel Ni@C-2. In a hydrogen-saturated 0.1M KOH electrolyte solution, the catalytic hydrogen oxidation activity of the material was evaluated by linear sweep voltammetry and a rotating disk electrode (Ф=5mm). The polarization curve of Aerogel Ni@C-2 catalyzed hydrogen oxidation reaction is as follows Figure 4 shown.

Embodiment 3

[0026] Add 3.49g of nickel nitrate hexahydrate and 0.51g of cyanuric acid into 60mL of ethanol, ultrasonically disperse for 0.5 hours, then transfer to a 80mL hydrothermal kettle, react at 150°C for 12 hours, and after natural cooling, wash with ethanol and water, respectively. , freeze-dried to obtain the precursor; then heat-treated at 400°C for 0.5 hours in a mixed atmosphere of hydrogen and argon (hydrogen gas fraction is 50%), and collected by cooling to obtain the airgel material Aerogel Ni@C-3. In a hydrogen-saturated 0.1M KOH electrolyte solution, the catalytic hydrogen oxidation activity of the material was evaluated by linear sweep voltammetry and a rotating disk electrode (Ф=5mm). The polarization curve of Aerogel Ni@C-3 catalyzed hydrogen oxidation reaction is as follows Figure 4 shown.

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Abstract

The invention discloses a preparation method and application of a carbon-coated nickel airgel material. The airgel material is a three-dimensional porous airgel structure formed by interweaving metal nanorods with a diameter in the range of 25-40nm. Covered by an ultra-thin graphitized carbon layer, the metal content is 90-99wt.%, the carbon content is 0.1-10wt.%, the preparation method is simple, the cost is low, and the metallic nickel airgel material wrapped by the ultra-thin carbon layer is obtained As an alkaline hydrogen oxidation electrocatalyst, it exhibits better activity in catalyzing the anode hydrogen oxidation reaction of alkaline polymer electrolyte membrane fuel cells.

Description

Technical field: [0001] The invention relates to the field of electrocatalysis, in particular to a preparation method and application of a carbon-coated nickel airgel material. Background technique: [0002] Alkaline polymer electrolyte fuel cell (APEFC) is a new type of fuel cell technology that combines the advantages of traditional alkaline fuel cell (AFC) and proton exchange membrane fuel cell (PEMFC). , which greatly overcomes the problems of lye leakage and carbonation in traditional AFC; at the same time, since the corrosion resistance of metal materials in alkaline environment is significantly lower than that in acidic environment, APEFC provides a good solution for the use of non-precious metals instead of precious metals. huge potential. [0003] However, the kinetic rate of anodic reaction in alkaline environment is much slower than that in acidic condition, even for the noble metal platinum, there is a gap of about two orders of magnitude. Therefore, in order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCH01M4/9041Y02E60/50
Inventor 曾黎明孙泰唐仁衡
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI