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Double carbon-nitrogen compound-coated cobalt-doped nanomaterial, preparation method and application

A technology of nanomaterials and composites, which is applied in the field of preparation of cobalt-doped nanomaterials, can solve the problems of catalyst activity decline, low stability, and activity decline, and achieve enhanced conductivity, strong electrical activity, and high nitrogen content. Effect

Active Publication Date: 2018-06-15
衢州市衢发瑞新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that the current cobalt-doped carbon-nitrogen complexes are not very stable, and their activity decreases after repeated use, because metal cobalt itself is not a chemically inert metal. , cobalt will continue to dissolve from the complex during use, resulting in a serious decline in the activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) First acidify carbon nanotube (CNT) particles according to the usual method: mix CNT particles with concentrated sulfuric acid, heat to 50 O C, after continuing to insulate under stirring for 2 hours, filter and wash with a large amount of water until the filtrate is neutral, at 50 O C under vacuum drying for 24 hours to obtain acidified CNT particles;

[0025] (2) Add 100 mg of the above-mentioned acidified CNT particles to 800 mL of water, and form a dispersion under vigorous stirring; then add 0.6 mL of pyrrole and 0.6 mL of aniline to the dispersion at the same time, and stir to form a uniform mixture;

[0026] (3) 3.8 g ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) was dissolved in 40 mL of water, and then 500 mg of cobalt nitrate (Co(NO 3 ) 2 ·6H2 O), after stirring and dissolving, quickly pour the formed solution into the above-mentioned homogeneous mixture, stir the mixture evenly, then place the mixture under 10 O In a water bath of C, react under slow st...

Embodiment 2

[0040] Step (1) is the same as step (1) in Example 1.

[0041] (2) Add 500 mg of the above-mentioned acidified CNT particles to 800 mL of water, and form a dispersion under vigorous stirring; then add 0.6 mL of pyrrole and 0.6 mL of aniline to the dispersion at the same time, and stir to form a uniform mixture;

[0042] (3) 3.8 g ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) was dissolved in 40 mL of water, and then 500 mg of cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), after stirring and dissolving, quickly pour the formed solution into the above-mentioned homogeneous mixture, stir the mixture evenly, then place the mixture under 10 O In a water bath of C, react under slow stirring for 24 hours; finally the mixture is transferred to a rotary evaporator at 60 O The solution was evaporated to dryness in vacuo under C, and the black solid particles formed were then transferred to a vacuum desiccator, and dried at 40 O C and dried for 24 hours to obtain a catalyst precursor.

[0043...

Embodiment 3

[0055] Step (1) is the same as step (1) in Example 1.

[0056] (2) Add 1000 mg of the above-mentioned acidified CNT particles to 800 mL of water, and form a dispersion under vigorous stirring; then add 0.6 mL of pyrrole and 0.6 mL of aniline to the dispersion at the same time, and stir to form a uniform mixture;

[0057] (3) 3.8 g ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) was dissolved in 40 mL of water, and then 500 mg of cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), after stirring and dissolving, quickly pour the formed solution into the above-mentioned homogeneous mixture, stir the mixture evenly, then place the mixture under 10 O In a water bath of C, react under slow stirring for 24 hours; finally the mixture is transferred to a rotary evaporator at 60 O The solution was evaporated to dryness in vacuo under C, and the black solid particles formed were then transferred to a vacuum desiccator, and dried at 40 O C and dried for 24 hours to obtain a catalyst precursor.

[005...

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Abstract

The invention discloses a double carbon-nitrogen compound-coated cobalt-doped nanomaterial and a preparation method thereof. The method comprises the steps of (1) carrying out polymerization of pyrrole and polymerization of aniline at the same time in the presence of an acidified carbon nanotube (CNT) and a cobalt salt to form black solid particles, namely a catalyst precursor, and then carrying out pyrolyzation on the black solid particles at 850 DEG C to obtain a catalyst intermediate-1; (2) forming polydopamine on the surface of the catalyst intermediate-1 and then carrying out pyrolyzationat 800 DEG C to obtain a catalyst intermediate-2; (3) mixing glucose, dicyandiamide and the catalyst intermediate-2 in water, drying a solution by distillation and carrying out pyrolyzation on the formed solid at 800 DEG C to obtain a catalyst intermediate-3; and (4) treating the catalyst intermediate-3 through H2SO4, removing impurities and unreacted materials and drying to obtain black particles, namely a catalyst sample. The double carbon-nitrogen compound-coated cobalt-doped nanomaterial has the advantages of high nitrogen content, high electroactivity and high conductivity, and metal cobalt is coated with a multilayer carbon-nitrogen compound.

Description

technical field [0001] The invention relates to a method for preparing a cobalt-doped nanometer material wrapped by a double-layer carbon-nitrogen compound and its electrochemical performance, and belongs to the field of nanomaterials and electrochemical energy sources. Background technique [0002] At present, the world's energy system is mainly based on fossil energy. However, due to well-known reasons, the search for alternatives to fossil energy has always been highly valued by governments and scientific and technological workers, and it is also the main driving force for the sustainable development of the world. Among these alternatives to fossil energy, electrochemical energy is one of the most concerned and promising new energy sources. Electrochemical energy mainly includes new electrochemical batteries and electrochemical supercapacitors, among which fuel cells play a very important role in new electrochemical batteries. At present, fuel cells and electrochemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90G01N27/26G01N27/327B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N27/26G01N27/3277G01N27/3278H01M4/8825H01M4/9041H01M4/9091Y02E60/50
Inventor 易清风李广余亮
Owner 衢州市衢发瑞新能源材料有限公司
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