Porous nitrogen-doped carbon supported cobalt nano-material, preparation method and application thereof

A technology of nitrogen-doped carbon and porous materials, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor durability and expensive electrocatalysts, and achieve good electrocatalytic performance, The effect of excellent electron transport performance and good stability

Active Publication Date: 2018-11-02
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a porous nitrogen-doped carbon-supported co

Method used

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  • Porous nitrogen-doped carbon supported cobalt nano-material, preparation method and application thereof
  • Porous nitrogen-doped carbon supported cobalt nano-material, preparation method and application thereof
  • Porous nitrogen-doped carbon supported cobalt nano-material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Take 264.6 mg Na 3 C 6 h 5 o 7 2H 2 O was dissolved in 20 ml deionized water, and 174.6 mg Co(NO 3 ) 2 ·6H 2 O stirred to dissolve, as A solution. Take another 132.9 mg K 3 [Co(CN) 6 ] was dissolved in 20 ml deionized water as solution B. After both solution A and solution B are fully dissolved, pour solution B into solution A under stirring, stir for 2 minutes, and leave to age for 24 hours. After that, put the obtained precipitate into a centrifuge tube, centrifuge for 3 minutes, add deionized water to wash 3 times, and set the rotation speed to 10000 rpm·min -1 、9500rmp·min -1 、9000rmp·min -1 . The sample obtained by centrifugation was placed in a vacuum drying oven and dried at 60 °C for 12 h to obtain a cobalt-based precursor. The morphology scanning image is as follows: figure 1 shown.

[0049] (2) Weigh 250 mg of Tris and dissolve it in 100 ml of deionized water to make a buffer solution. Dissolve 443.8 mg of the cobalt-based precursor obtained...

Embodiment 2

[0053] (1) Take 1323.5mg Na 3 C 6 h 5 o 7 2H 2 O was dissolved in 50 ml deionized water, and 873.9 mg Co(NO 3 ) 2 ·6H 2 O stirred to dissolve, as A solution. Another 738.5mg K 3 [Co(CN) 6 ] was dissolved in 50 ml deionized water as solution B. After both solution A and solution B are fully dissolved, under stirring, inject solution B into solution A with a syringe pump at an injection speed of 2m·min -1 , and stirred for 24 h after injection. After that, put the obtained precipitate into a centrifuge tube, centrifuge for 3 minutes, add deionized water to wash 3 times, and set the rotation speed to 10000 rpm·min -1 . The centrifuged sample was placed in a vacuum oven and dried at 60 °C for 14 h to obtain a cobalt-based precursor.

[0054] (2) Weigh 250 mg Tris and dissolve it in 100 ml deionized water to make a buffer solution. Dissolve 378.2 mg of the cobalt-based precursor obtained in step (1) in the buffer solution, stir, and sonicate to make it evenly mixed. I...

Embodiment 3

[0058] (1) Take 529.4 mg Na 3 C 6 h 5 o 7 2H 2 O was dissolved in 40 ml deionized water, and 349.2 mg Co(NO 3 ) 2 ·H 2 O stirred to dissolve, as A solution. Another 265.8 mg K 3 [Co(CN) 6 ] was dissolved in 40 ml deionized water as solution B. After both solution A and solution B are fully dissolved, pour solution B into solution A under stirring, stir for 3 minutes, and leave to age for 24 hours. After that, put the resulting precipitate into a centrifuge tube, centrifuge for 3 minutes, add deionized water to wash 3 times, and rotate at 9500rmp·min -1 . The centrifuged sample was placed in a vacuum oven and dried at 60 °C for 10 h to obtain a cobalt-based precursor.

[0059] (2) Weigh 250 mg of Tris and dissolve it in 100 ml of deionized water to make a buffer solution. Dissolve 300 mg of the cobalt-based precursor obtained in step (1) in the buffer solution, stir and sonicate to make it evenly mixed. In addition, 150 mg of dopamine hydrochloride was dissolved in...

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Abstract

The invention relates to a porous nitrogen-doped carbon supported cobalt nano-material, a preparation method and application thereof. The preparation method comprises the steps of dissolving a cobaltsource in a sodium citrate solution, having a hybrid reaction with cobalt potassium cyanide to obtain a Prussian blue similar nanocube; mixing and stirring with a dopamine aqueous solution in a buffering solution to obtain a dopamine coated cobalt-based Prussian blue composite material; after drying, annealing and roasting at a high temperature; then adding inorganic acid in a reaction kettle foracid-pickling to obtain the porous nitrogen-adopted carbon supported cobalt nano-material. The result shows that the material has a relatively good electronic transmission performance, a huge specificsurface area, good stability and many active site, has relatively good electrocatalytic activity in alkaline electrolyte and can serve as a three-function catalyst for oxygen precipitation, hydrogenprecipitation and oxygen reduction reaction.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a porous nitrogen-doped carbon-supported cobalt nanomaterial, a preparation method and an application thereof. Background technique [0002] With the rapid consumption of fossil energy and the intensification of environmental problems caused by its use, it is becoming more and more urgent to seek efficient, green, sustainable and safe energy. [0003] Fuel cells represented by zinc-air batteries can effectively convert chemical energy into electrical energy. Due to their high theoretical energy density, low cost, and safety, they have attracted widespread attention from researchers and are expected to be applied to large mobile devices (such as electric vehicles) and portable devices such as cell phones. However, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in the working process are inefficient, which reduces the energy efficiency and c...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88B82Y30/00C25B1/04C25B11/04
CPCB82Y30/00C25B1/04C25B11/04H01M4/88H01M4/9041H01M4/9083Y02E60/36Y02E60/50
Inventor 何传新李国敏胡琪朱斌柴晓燕范梁栋刘剑洪
Owner SHENZHEN UNIV
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