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Cobalt disulfide/carbon-nitrogen composite material for water electrolysis oxygen evolution, and synthesis method thereof

A technology of cobalt disulfide and composite materials, applied in chemical instruments and methods, electrolytic processes, electrolytic components, etc., can solve problems such as performance needs to be improved, and achieve the effects of excellent hydrophilicity, uniform appearance, and excellent performance

Active Publication Date: 2019-06-07
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Jian-Rong Li et al. (Adv.EnergyMater.2017, 1602643) used ZIF-67 as a template to oxidize, vulcanize, and phosphate it to catalyze oxygen evolution, but the performance needs to be improved

Method used

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  • Cobalt disulfide/carbon-nitrogen composite material for water electrolysis oxygen evolution, and synthesis method thereof
  • Cobalt disulfide/carbon-nitrogen composite material for water electrolysis oxygen evolution, and synthesis method thereof
  • Cobalt disulfide/carbon-nitrogen composite material for water electrolysis oxygen evolution, and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 1.746g Co(NO 3 ) 2 ·6H 2O in a mixed solvent of 40ml ethanol and 40mL methanol, stirred with a magnetic stirrer for 10min, and then sonicated for 10min. Similarly, weigh 1.97g of 2-methylimidazole in a mixed solvent of 40ml of ethanol and 40ml of methanol, stir with a magnetic stirrer for 10min, and then sonicate for 10min. Pour the above organic solution into the salt solution quickly while stirring, and continue to stir for 10 minutes, then let stand at room temperature for 24 hours, wash the obtained purple precipitate with ethanol and methanol alternately, centrifuge, and dry at 60°C for 12 hours to obtain a metal organic framework Compound ZIF-67. figure 1 (a) The XRD pattern of the prepared ZIF-67 is given, and its characteristic peaks correspond to the fitted peaks one by one, figure 2 The electron microscope image in (a) shows that ZIF-67 is a dodecahedral structure with uniform size and smooth appearance. Figure 5 The Raman peaks of ZIF in the ...

Embodiment 2

[0039] (1) Weigh 1.746g Co(NO 3 ) 2 ·6H 2 O in a mixed solvent of 40ml ethanol and 40ml methanol, stirred with a magnetic stirrer for 10min, then sonicated for 10min. Similarly, weigh 1.97g of 2-methylimidazole in a mixed solvent of 40ml of ethanol and 40ml of methanol, stir with a magnetic stirrer for 10min, and then sonicate for 10min. Pour the above-mentioned organic solution into the saline solution rapidly while stirring, and keep stirring for 5 minutes, then let stand at room temperature for 18 hours, wash the obtained purple precipitate with ethanol and methanol alternately, centrifuge, and dry at 60°C for 12 hours to obtain a metal organic framework ZIF-67.

[0040] (2) Put the ZIF-67 in step (1) in a magnetic boat and anneal at 300°C for 2h in a nitrogen atmosphere in a tube furnace, then anneal at 1000°C for 3.5h, and the sample taken out after cooling is a porous dodecahedron Cobalt / carbon nitrogen composite.

[0041] (3) Add the cobalt / carbon-nitrogen composit...

Embodiment 3

[0044] (1) Weigh 1.746g Co(NO 3 ) 2 ·6H 2 O in a mixed solvent of 40ml ethanol and 40ml methanol, stirred with a magnetic stirrer for 10min, then sonicated for 10min. Similarly, weigh 1.97g of 2-methylimidazole in a mixed solvent of 50ml of ethanol and 40ml of methanol, stir with a magnetic stirrer for 10min, and then sonicate for 10min. Pour the above-mentioned organic solution into the salt solution rapidly while stirring, and continue to stir for 20 minutes, then let stand at room temperature for 24 hours, wash the obtained purple precipitate with ethanol and methanol alternately, centrifuge, and dry at 60°C for 12 hours to obtain a metal organic framework ZIF-67.

[0045] (2) Put ZIF-67 in step (1) in a magnetic boat and anneal at 300°C for 2 hours in a nitrogen atmosphere in a tube furnace, then anneal at 800°C for 4 hours, and the sample taken out after cooling is porous dodecahedral cobalt / carbon-nitrogen composite materials.

[0046] (3) Put the cobalt / carbon-ni...

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Abstract

The invention relates to a cobalt disulfide / carbon-nitrogen composite material for water electrolysis oxygen evolution, and a synthesis method thereof. The material is a porous dodecahedral structure,and CoS2 nanoparticles are coated with graphite carbon and are uniformly distributed on a dodecahedral carbon-nitrogen framework. The material has excellent activity and ultra-long-time stability inwater electrolysis oxygen evolution a water electrolysis anodic oxygen evolution catalyst, has excellent performances, has a far better catalysis effect than noble metals Ru and Ir, has far better performances than non-noble metal material catalysts obtained by other methods, and has a great application prospect in the field of water electrolysis oxygen evolution.

Description

technical field [0001] The invention belongs to the technical field of electrolytic water catalysts, and relates to a novel high-efficiency non-precious metal electrolytic water oxygen evolution catalyst cobalt disulfide / carbon-nitrogen composite material and a preparation method thereof. Background technique [0002] With the increasing demand for energy, the development of efficient and stable new energy conversion systems has become a research hotspot in the scientific community. Electrolyzed water is a clean and sustainable method for producing hydrogen on a large scale. It is an energy conversion system based on "water", "hydrogen" and "oxygen", which can be regarded as a "zero emission" clean energy conversion system in the true sense. . Designing high-performance catalyst materials is the core of improving the performance of electrolyzed water. In the process of electrolysis of water, since the oxygen evolution process is a four-electron process, a higher overpotent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCY02E60/36
Inventor 余颖陈文娟张维邱明强
Owner HUAZHONG NORMAL UNIV
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