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Nano-cobalt/cobalt sulfide loaded heteroatom doped porous carbon composite catalyst and preparation method and application thereof

A technology of cobalt sulfide and nano-cobalt, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as increasing the complexity of the preparation process

Inactive Publication Date: 2019-05-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will undoubtedly increase the complexity of the preparation process

Method used

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  • Nano-cobalt/cobalt sulfide loaded heteroatom doped porous carbon composite catalyst and preparation method and application thereof
  • Nano-cobalt/cobalt sulfide loaded heteroatom doped porous carbon composite catalyst and preparation method and application thereof
  • Nano-cobalt/cobalt sulfide loaded heteroatom doped porous carbon composite catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Synthesis of nano-cobalt / cobalt sulfide supported on heteroatom-doped porous carbon composite electrocatalytic monolithic water splitting catalyst

[0032] (1) Dissolve 0.435g of cobalt nitrate hexahydrate, 0.172g of 2,5-thiophenedicarboxylic acid and 0.198g of 1,3-bis(4-pyridyl)propane in 30mL of N,N-dimethylformamide, Stir at room temperature for 2h. Then stirred and refluxed at 120° C. for 12 h to obtain a purple turbid solution. After filtering, washing with water and vacuum drying, the precursor (Co-NSOMOF) was ground to obtain a purple solid powder. PXRD of the precursor such as figure 1 As shown, the as-prepared precursors almost completely match the PXRD peaks simulated with single crystal data, indicating that the as-prepared precursors have high crystallinity and purity.

[0033](2) 400 mg of the purple solid powder obtained in step (1) is placed in a quartz boat, and the quartz boat is placed in a tube furnace, and the air in the furnace is exha...

Embodiment 2

[0036] Example 2: Performance test of nano cobalt / cobalt sulfide supported on heteroatom-doped porous carbon composite material of the present invention as an electrocatalyst

[0037] Preparation of electrocatalyst working electrode:

[0038] Co / Co prepared by the present invention by 2mg 9 S 8 The @NSOC catalyst was dispersed in 220 μL of Nafion solution containing 100 μL of water, 100 μL of DMF and 20 μL of 5% by mass, and then sonicated for 30 minutes to obtain a slurry with uniform catalyst dispersion. Then, 5 μL of the slurry was drop-coated on the surface of the glassy carbon electrode using a micropipette, and then dried at room temperature for use. The electrocatalyst performance test adopts a three-electrode system, and the electrolyte is 1mol L -1 aqueous potassium hydroxide solution. The test instrument is Shanghai Chenhua CHI660E Electrochemical Workstation.

[0039] Figure 5 It is the electrocatalytic oxygen evolution property test diagram of the catalyst o...

Embodiment 3

[0044] Example 3: Application of nano-cobalt / cobalt sulfide supported by heteroatom-doped porous carbon composite catalysts prepared in the present invention in monolithic water-splitting electrolytic cells

[0045] Figure 10 The catalyst prepared by the present invention is respectively used as the cathode and the anode of the integral water splitting electrolytic cell, and the electrolyte is 1mol L -1 Aqueous potassium hydroxide solution, obvious hydrogen and oxygen generation can be observed.

[0046] Figure 11 Linear scanning polarization curves of the monolithic water-splitting electrolysis cell assembled using the prepared catalyst as cathode and anode materials, when the current density is 10mA cm -2 , with a lower battery voltage of 1.56V.

[0047] Such as Figure 12 As shown, the overall water splitting electrolytic cell assembled with the prepared catalyst of the present invention has no obvious change in the relevant current after 10 h of chronoamperometry tes...

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Abstract

The invention discloses a nano-cobalt / cobalt sulfide loaded heteroatom doped porous carbon composite catalyst and a preparation method and application thereof and relates to the technical field of nano composite catalysts and electrocatalysis. The composite catalyst is prepared by taking a nitrogen-sulfur-oxygen tri-heteroatom hybrid cobalt-based metal-organic frame material (shortened for Co-NSOMOF) as a precursor and is used for efficiently electrolyzing water. In a 1mol / L potassium hydroxide electrolyte, when the current density reaches 10mA / cm<2>, the battery voltage is relatively low (1.56V). After long-time cycle test, the catalyst still can keep relatively high catalytic activity, has relatively high stability and has a relatively high actual application value.

Description

technical field [0001] The invention relates to the technical field of nanocomposite catalysts and electrocatalysis, in particular to a heteroatom-doped porous carbon composite catalyst supported by nano cobalt / cobalt sulfide, its preparation method and its application in electrocatalytic overall water splitting. Background technique [0002] With the development of global industrialization in today's society, the excessive use of fossil energy has led to an energy crisis and increasingly serious environmental pollution problems. Hydrogen has a high energy density, and the only product after combustion is water. It is a clean and environmentally friendly renewable energy carrier, and it is very promising to become a substitute for fossil energy in the future. Electrochemical water splitting is one of the most promising hydrogen production technologies, which consists of anodic oxygen evolution and cathodic hydrogen evolution reactions, but the large overpotential limits the ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/08C25B1/04C25B11/06
CPCY02E60/36
Inventor 臧双全李海洋杜娇王锐
Owner ZHENGZHOU UNIV
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