Porous nano composite material for fuel cell oxygen reduction catalyst

A nanocomposite, fuel cell technology, applied in nanotechnology for materials and surface science, physical/chemical process catalysts, nanotechnology, etc., can solve the loss of carbon mass, reduction of active sites, affecting the service life of catalysts, etc. problem, to achieve the effect of low cost, easy preparation, and improved ability to catalyze oxygen reduction

Inactive Publication Date: 2014-05-21
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since most of this synthesis method is high-temperature pyrolysis carbonization and nitrogen doping under the condition of ammonia, this will cause the loss of carbon quality, the reduction of active sites, and will affect the service life of the catalyst.

Method used

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  • Porous nano composite material for fuel cell oxygen reduction catalyst
  • Porous nano composite material for fuel cell oxygen reduction catalyst
  • Porous nano composite material for fuel cell oxygen reduction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A porous nanocomposite material used for fuel cell oxygen reduction catalyst, which is uniformly dispersed and embedded in a nitrogen-doped porous carbon support material by small-sized cobalt nanoparticles, wherein the particle size range of cobalt metal nanoparticles is 6- 7 nm, the mass percentage of cobalt metal is 25.8%, and the mass percentage of nitrogen in the porous carbon support is 3.53%.

[0031] The above-mentioned preparation method of the porous nanocomposite material used for fuel cell oxygen reduction catalyst, the steps are as follows:

[0032] 1) Synthesis of Schiff base complexes: bis-salicylaldehyde ethylenediamine acetal and cobalt(Ⅱ)

[0033] 3.5 g Schiff base ligand (salenH 2 ) was dissolved in 30 mL of absolute ethanol, and then 3.5 g of cobalt nitrate was dissolved in 20 mL of absolute ethanol and added dropwise to the three-neck flask under a water bath at 65 °C. Suction filtration under reduced pressure, wash twice with distilled water and ...

Embodiment 2

[0042] A porous nanocomposite material used for fuel cell oxygen reduction catalysts, which consists of small-sized iron and iron carbide nanoparticles uniformly dispersed and embedded in a nitrogen-doped porous carbon carrier material, wherein the iron and iron carbide nanoparticles The particle size range is 20-40 nm, the mass percentage of iron metal is 10.2%, and the mass percentage of nitrogen in the porous carbon support is 4.02%.

[0043] The preparation method of the above-mentioned porous nanocomposite material used as an oxygen reduction catalyst for fuel cells is basically the same as in Example 1, except that ferrous nitrate is used instead of cobalt nitrate to prepare a porous iron-nitrogen-carbon nanocomposite material.

[0044] Figure 5 It is the XRD pattern of the porous iron-nitrogen-carbon nanocomposite material, which shows that in addition to the diffraction peak of carbon, the prepared sample contains metallic iron and Fe 3 Phase C.

[0045] Figure 6 ...

Embodiment 3

[0050] A porous nanocomposite material for oxygen reduction catalysts, consisting of small-sized nickel nanoparticles uniformly dispersed and embedded in a nitrogen-doped porous carbon support material, wherein the nickel metal nanoparticles have a particle size range of 20-30 nm, the mass percentage of nickel metal is 19.1%, and the mass percentage of nitrogen in the porous carbon support is 3.16%.

[0051] The preparation method of the above-mentioned porous nanocomposite material used as an oxygen reduction catalyst for fuel cells is basically the same as in Example 1, except that nickel nitrate is used instead of cobalt nitrate to prepare a porous nickel-nitrogen-carbon nanocomposite material.

[0052] Figure 8 This is the XRD pattern of the porous nickel-nitrogen-carbon nanocomposite material, which shows that except for the diffraction peak of carbon, all other diffraction peaks can be attributed to metallic nickel.

[0053] Figure 9 This is a TEM photo of the nickel...

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Abstract

The invention discloses a porous nano composite material for a fuel cell oxygen reduction catalyst, and is an M-N-C porous nano composite material, wherein M in M-N-C refers to base metal ferrum, cobalt or nickel, N refers to nitrogen, and C refers to carbon; small-particle-size metal nano particles are uniformly dispersed and embedded in a nitrogen-doped porous carbon carrier material; the base metal nano particles have the particle size range being 5-100nm; the mass percentage of nitrogen contained in the porous carbon carrier is 3-7%. The porous nano composite material for the fuel cell oxygen reduction catalyst, which is provided by the invention, has the advantages that because of the in-situ nitrogen doping of a carbon substrate, the implant of base metal nano particles in uniform distribution and the formation of the porous structure with high specific area, the catalytic oxygen reduction capability of the porous nano composite material is improved obviously, and the cycle stability of the material is improved; a precursor prepared by the composite material is low in cost, is easy to prepare, is controlled easily in the preparation process, is simple to operate, and facilitates industrial large-scale production.

Description

technical field [0001] The invention relates to the preparation of an oxygen reduction catalyst for a fuel cell, in particular to a porous nanocomposite material used for an oxygen reduction catalyst for a fuel cell. Background technique [0002] Due to its high energy density, high energy conversion efficiency and no pollution, fuel cells have been regarded as one of the most promising energy conversion technologies. In recent years, fuel cells have achieved considerable development, but their large-scale market applications still face problems such as high cost and low performance. Currently, the most widely used cathode oxygen reduction catalysts in fuel cells are carbon-supported platinum and platinum alloy catalysts. However, due to the high price and scarcity of precious metals such as platinum and ruthenium, the production cost of fuel cells is relatively high, which severely limits the commercialization process of fuel cells. Therefore, the development of low-cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J27/24B01J35/10B82Y30/00
CPCB82Y30/00H01M4/9083Y02E60/50
Inventor 陈军杜婧程方益王诗文陶占良梁静
Owner NANKAI UNIV
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