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Cobalt and nitrogen doped carbon nanorod catalyst as well as preparation method and application thereof

A nitrogen-doped carbon, nanorod technology, applied in nanotechnology, solid electrolyte fuel cells, electrical components, etc., can solve the problems of high cost, limited battery industrialization and large-scale application, limited platinum resources, etc. The catalyst has the effect of low cost and uniform structure

Active Publication Date: 2017-06-23
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
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Problems solved by technology

For now, whether it is a proton exchange membrane fuel cell under acidic conditions (such as a direct methanol fuel cell), or a metal-air battery under an alkaline condition (such as a Zn-air battery), the cathode catalyst is a platinum-based noble metal catalyst. The high cost and limited platinum resources significantly limit the industrialization and large-scale application of this type of battery, so it is urgent to develop low-cost, high-performance low-platinum or even non-platinum ORR catalysts
[0003] At present, there are two main technical approaches for the research and development of ORR catalysts: one is the development of alloyed catalysts with low platinum content, such as PtCo, PtCr, PtNi, etc., by improving the utilization efficiency of precious metals to reduce their consumption and cost. However, this technology The pathway is still based on platinum electrocatalytic activity, and it is difficult to achieve a substantial reduction in battery cost

Method used

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  • Cobalt and nitrogen doped carbon nanorod catalyst as well as preparation method and application thereof
  • Cobalt and nitrogen doped carbon nanorod catalyst as well as preparation method and application thereof
  • Cobalt and nitrogen doped carbon nanorod catalyst as well as preparation method and application thereof

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preparation example Construction

[0050] see figure 1 , the invention provides a method for preparing a cobalt-nitrogen-doped carbon nanorod catalyst, the preparation method of the cobalt-nitrogen-doped carbon nanorod catalyst comprises the following steps:

[0051] 1) dissolving nitrogen source, carbon source and cobalt salt in N,N-dimethylformamide solvent to obtain electrospinning solution;

[0052] 2) Electrospinning the electrospinning solution to obtain nanofiber cloth;

[0053] 3) heat-treating the nanofiber cloth to obtain a black fiber material;

[0054] 4) The black fiber material is sequentially washed with water, suction filtered, dried and ground to obtain a cobalt nitrogen-doped carbon nanorod catalyst.

[0055] In step 1), see figure 1 In the S1 step, the nitrogen source, the carbon source and the cobalt salt are dissolved in N,N-dimethylformamide (DMF) solvent to obtain an electrospinning solution.

[0056] As an example, the nitrogen source is dimethylaminopyridine (DMPA), tetrazolium, dic...

Embodiment 1

[0079] 1. Weigh 2.0g DMAP powder and ultrasonically dissolve it in 12.5g N,N dimethylformamide (DMF) solvent, ultrasonic time 10min, add 1.0g PAN powder, stir and dissolve for 2 hours in a water bath at 60°C, and form a light yellow transparent solution. Finally, add 100 mg of cobalt acetate, stir and dissolve at room temperature for 2 hours, and finally make a homogeneous electrospinning solution;

[0080] 2. Electrospinning the electrospinning solution to form a nanofiber cloth. The electrospinning voltage (i.e. the voltage of high voltage static electricity) is 17kV, the spinning rate (i.e. the advancing speed of the electrospinning solution) is 0.7ml / h, and the distance between the injection end of the syringe and the surface of the receiving plate is 12cm;

[0081] 3. Place the nanofiber cloth in an open quartz boat and dry it in a vacuum oven at 60°C for 12 hours under vacuum;

[0082] 4. Transfer the dried nanofiber cloth to a muffle furnace, raise the temperature to ...

Embodiment 2

[0093] 1. Place the Co / N / C nanorod catalyst prepared by the steps described in Example 1 in 0.5M sulfuric acid solution, stir at 60°C for 24 hours to completely dissolve the nanoparticles of metal cobalt and its oxides on the surface .

[0094] 2. Wash the acid-washed Co / N / C catalyst with ultrapure water to neutrality, filter with suction to obtain a filter cake, and vacuum-dry it at 60°C for 12 hours to obtain the acid-washed A-Co / N / C nanorod catalyst .

[0095] see Figure 10 to Figure 13 , Figure 10 It is the TEM figure of the cobalt-nitrogen-doped carbon nanorod catalyst after acidification in the present embodiment; Figure 11 It is the element mapping diagram under the dark field of the acidified cobalt-nitrogen-doped carbon nanorod catalyst in this embodiment; Figure 12 It is the XPS full spectrum of the cobalt-nitrogen-doped carbon nanorod catalyst after acidification in the present embodiment; Figure 13 for Figure 12 The XPS diagram of N1s in the middle.

...

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Abstract

The invention provides a cobalt and nitrogen doped carbon nanorod catalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps: 1) a nitrogen source, a carbon source and cobalt salt are dissolved in a N,N-dimethylformamide solvent in order to obtain a static spinning solution; 2) static spinning is carried out for the static spinning solution in order to obtain nanofiber cloth; 3) heat treatment is carried out for the nanofiber cloth in order to obtain a black fibrous material; 4) washing, pumping filtration, drying and grinding are carried out for the black fibrous material in order, and the cobalt and nitrogen doped carbon nanorod catalyst is obtained. The method which combines static spinning and heat treatment technology is employed for preparing the cobalt and nitrogen doped carbon nanorod catalyst, the catalyst has the advantages of low cost, uniform structure and excellent performance, and excellent oxygen reduction reaction (ORR) electrocatalytic activity is shown in acidic and alkaline mediums; the whole preparation technology is simple and reliable, and is suitable for scale expansion; in the future, the catalyst can replace platinum based noble metal catalyst, and can be applied to the fields of proton exchange membrane fuel cell, metal-air fuel cell, and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer materials, and in particular relates to a cobalt nitrogen-doped carbon nanorod catalyst and a preparation method and application thereof. Background technique [0002] Energy and the environment are global problems today, and the development of new, green and sustainable energy has become the most urgent research focus. Proton exchange membrane fuel cells and metal-air fuel cells have high energy density and energy conversion efficiency, and at the same time cause less pollution to the environment. They are ideal power sources at present and in the future, and thus have attracted extensive attention from scientists all over the world. To this end, countries have invested a lot of manpower and material resources to conduct in-depth research on it. Among them, the research hotspots mainly focus on the oxygen reduction reaction (ORR) catalyst on the air electrode side. For now, whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M12/06H01M4/90H01M4/88B82Y40/00
CPCB82Y40/00H01M4/88H01M4/90H01M8/10H01M12/06Y02E60/50
Inventor 杨辉程庆庆邹志青邹亮亮周扬汪保国
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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