High loading capacity metal single atom proton exchange membrane fuel cell catalytic materials, and preparation method thereof

A proton exchange membrane and fuel cell technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problems of limited sites, limit the application of single-atom catalysts, and low loading, and achieve improved The effect of applying value

Active Publication Date: 2019-02-26
北京海得利兹新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sites of stable single atoms in metal oxides are limited. In order to avoid agglomeration, scientists adopt a strategy of reducing the loading. Therefore, the loading of the synthesized single-atom catalysts is often very low (<0.5wt%), which greatly limits the single-atom catalysts. Applications of Atomic Catalysts

Method used

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  • High loading capacity metal single atom proton exchange membrane fuel cell catalytic materials, and preparation method thereof
  • High loading capacity metal single atom proton exchange membrane fuel cell catalytic materials, and preparation method thereof
  • High loading capacity metal single atom proton exchange membrane fuel cell catalytic materials, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 10 grams of dicyanamide, 100 mg of carbon dioxide tube and 100 mg of hemoglobin, add 10 ml of ethanol and grind until mixed evenly. For protective gas (flow rate is 80sccm), the temperature rises to 300°C at a rate of 1°C / min, the heat treatment time is 3 hours under argon, and the temperature continues to rise to 600°C, and after 3 hours of treatment under argon, continue to heat up to 900°C , treated for 1 hour, and cooled to room temperature. A black sample 1 (FeSA-N-CNT) was taken out. As a comparison, take 10 grams of dicyanamide, 100 mg of carbon oxide tubes and 100 mg of iron acetylacetonate, and synthesize sample 1 (FeSA-N-CNT) and black sample 2 (FeAC-N-CNT) according to the above synthesis method. figure 1 Medium transmission electron microscope pictures (a-b) show that the surface of the prepared sample 1 carbon nanotubes is covered with a layer of amorphous carbon thin layer and there is a graphene-like structure between the carbon tubes, further high-...

Embodiment 2

[0030] Take 10 grams of dicyanamide, 100 mg of carbon dioxide tubes, 100 mg of heme and 10 mg of copper phthalocyanine, add 10 ml of ethanol and grind until mixed evenly, repeat 5 times, dry at room temperature, grind evenly to obtain a light powder, place in In the furnace, use argon as protective gas (flow velocity is 80 sccm), rise to 300°C at a rate of 1°C / min, heat treatment time under argon is 3 hours, continue to heat up to 600°C, and process under argon for 3 hours, Continue to raise the temperature to 900° C., treat for 1 hour, cool down to room temperature, and take out the black sample 3 (FeCuSA-N-CNT). As a comparison, take 10 grams of dicyanamide, 100 mg of carbon dioxide tubes, 100 mg of heme and 10 mg of copper phthalocyanine, add 10 ml of ethanol and grind until the mixture is uniform, repeat 5 times, dry at room temperature, and grind evenly to obtain a shallow powder , placed in a furnace with argon as a protective gas (flow rate of 80sccm), rising to 900°C a...

Embodiment 3

[0032] Take 10 grams of dicyanamide, 100 mg of graphene oxide, 100 mg of heme and 10 mg of copper phthalocyanine, add 10 ml of ethanol and grind until mixed evenly, repeat 5 times, dry at room temperature, grind evenly to obtain a light powder, place in In the furnace, use argon as protective gas (flow velocity is 80 sccm), rise to 300°C at a rate of 1°C / min, heat treatment time under argon is 3 hours, continue to heat up to 600°C, and process under argon for 3 hours, Continue to heat up to 900 degrees, process for 1 hour, and cool down to room temperature. A black sample 5 (FeCuSA-N-G) was taken out. Figure 4 SEM and TEM images (a-b) in the middle show that sample 5 has a graphene single-layer structure. In the further high-resolution high-angle annular dark field image (c), it can be clearly seen that single iron-copper atoms are distributed on the graphene structure. According to thermogravimetric analysis, the total content of iron and copper is about 7-8wt%.

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Abstract

The invention belongs to the field of metal single atom doped carbon material, and especially relates to a simple method used for preparing high loading capacity metal single atom catalytic materials.According to the simple method, nitric acid functionalized carbon tube graphene is taken as a carrier; carbon resources and nitrogen resources such as urea, dicyandiamide, and melamine which are capable of generating C3N4 in pyrolysis process are taken as single atom dispersion templates; metal organic salts such as heme and phthalocyanines are taken as precursors; at inert atmosphere, multi-steppyrolysis is adopted to prepare a series of loaded metal single atom catalytic materials. The method is capable of solving problems in the prior art that single atom metal loading capacity is low, and dispersibility is poor. The single atom catalytic materials synthesized using the method possess excellent oxidation reduction performance at acidic conditions, can be taken as proton exchange membrane fuel cell cathode and anode materials, and are capable of reducing proton exchange membrane fuel cell catalyst cost.

Description

technical field [0001] The invention relates to a metal single-atom proton exchange membrane fuel cell catalyst material, in particular to a metal single-atom catalyst with a high loading capacity. Background technique [0002] As a widely used catalytic material in petrochemical industry, clean energy storage and conversion, supported nanoparticles have a great impact on the activity, selectivity and stability of the catalyst. The morphology and size of loaded nanoparticles are often inhomogeneous, which makes controllable selective catalysis a difficult research point. At the same time, on the same nanoparticle, the distribution patterns of metal atoms are different. Unsaturated coordinated surface metal atoms have different coordination numbers and thus often play different roles in the catalytic process, limiting the selectivity and controllability of the catalyst. In recent years, in order to improve the activity of catalytic materials, the utilization rate of active ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/9041H01M4/9083Y02E60/50
Inventor 蒋三平郭志斌张艳
Owner 北京海得利兹新技术有限公司
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