Nano-lamellar structure of Ni3S2/MoS2 composite material and preparation method thereof

A technology of nickel trisulfide and molybdenum disulfide, which is used in nanotechnology, structural parts, nanotechnology and other directions for materials and surface science, can solve the problems that cannot meet the requirements of large-scale practical application of low-temperature fuel cells, oxygen reduction reaction The catalytic properties are not good enough, and the catalytic properties of the oxygen reduction reaction are not good enough to achieve the effects of good resistance to methanol poisoning, abundant electrochemical active sites, and good catalytic stability.

Inactive Publication Date: 2018-04-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the parameters of this synthesis method are difficult to control, and it is not easy to form a large-scale production, and the catalytic properties of the product for the oxygen reduction reaction are still far inferior to the commercial 20% Pt / C catalyst (the initial potential is 970mV, the half-wave potential is 820mV, The limiting current is 4.2mA / cm 2 )
The above-mentioned technologies and materials have problems such as complex synthesis steps, difficulty in large-scale production, and insufficient catalytic properties of oxygen reduction reaction, which are far from meeting the requirements of large-scale practical use of low-temperature fuel cells.

Method used

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  • Nano-lamellar structure of Ni3S2/MoS2 composite material and preparation method thereof
  • Nano-lamellar structure of Ni3S2/MoS2 composite material and preparation method thereof
  • Nano-lamellar structure of Ni3S2/MoS2 composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 160mg of ammonium molybdate, 80mg of nickel chloride, 4g of template and 2g of thioacetamide into a mortar, mix and grind them, put the ground powder into a tube furnace, and pass through argon protection; then, put The burning temperature was raised to 600°C and maintained for 180 minutes, then raised to 780°C and maintained for 240 minutes; finally, the heating device was turned off, and it was taken out after it cooled naturally to room temperature.

[0032] The structures and properties of the composites prepared by the above method were characterized. figure 1 It is the X-ray diffraction spectrum of the obtained material, and the diffraction peaks in the figure are consistent with PDF#37-1492 and PDF#44-1418, indicating that the material is hexagonal MoS 2 with you 3 S 2 Complex; figure 2 It is the Raman spectrum of the composite material, and MoS can be clearly identified 2 The characteristic absorption peak; image 3 It is a TEM photo of the composite m...

Embodiment 2

[0039] Put 170mg of ammonium molybdate, 60mg of nickel chloride, 3.5g of template and 2g of thioacetamide into a mortar, mix and grind, put the ground powder into a tube furnace, and pass it into argon for protection; then, Raise the burning temperature to 600°C and maintain it for 180 minutes, then raise the burning temperature to 780°C and maintain it for 240 minutes; finally, turn off the heating device, wait for it to cool down to room temperature naturally, and take it out.

[0040] Oxygen reduction reaction catalytic properties: such as Figure 7 As shown, in the alkaline electrolyte (pH 13, 0.1M KOH), under the condition of rotating disc electrode rotating speed of 1600rpm, the onset potential of the oxygen reduction reaction is 975mV, the half-wave potential is 862mV, and the limiting current density is 4.0 mA / cm 2 , compared with commercial 20% Pt / C, the oxygen reduction onset potential and half-wave potential are more positive, indicating that the catalyst has bette...

Embodiment 3

[0042] Put 190mg of ammonium molybdate, 20mg of nickel chloride, 4g of template and 1.5g of thioacetamide into a mortar, mix and grind, put the ground powder into a tube furnace, and pass it into argon protection; then, Raise the burning temperature to 600°C and maintain it for 180 minutes, then raise the burning temperature to 780°C and maintain it for 240 minutes; finally, turn off the heating device, wait for it to cool down to room temperature naturally, and take it out.

[0043] Oxygen reduction reaction catalytic properties: In alkaline electrolyte (pH 13, 0.1M KOH), under the condition of rotating disk electrode speed of 1600rpm, the onset potential of oxygen reduction reaction is 850mV, the half-wave potential is 745mV, and the limiting current The density is 3.2mA / cm 2 , which has a catalytic activity for oxygen reduction reaction close to that of commercial 20% Pt / C.

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Abstract

The invention relates to a nano-lamellar structure of a Ni3S2/MoS2 composite material and a preparation method thereof. The nano-lamellar structure is formed from two-dimensional nano-sheets, in a stacking manner, of a composite material formed by uniformly mixing the Ni3S2 and the MoS2. The structure has two metal active centers, so that catalytic synergistic effect is improved through modes of vulcanization and in-situ composition; in addition, due to the lamellar structure, specific surface area of the material is increased greatly. The material has the oxygen reduction reaction catalytic performance equal to commercial 20% Pt/C catalyst. The composite material has simple synthesis method, is less in raw material consumption, is low in raw material cost, and has good industrial prospect.

Description

technical field [0001] The invention belongs to the field of electrocatalysts for chemical power sources, and in particular relates to a nanosheet structure of a nickel disulfide / molybdenum disulfide composite material and a preparation method thereof. Background technique [0002] Direct conversion of chemical energy into electrical energy has always been one of the most attractive power supply methods. Low-temperature batteries such as proton exchange membrane fuel cells (PEMFC) and metal-air batteries are environmentally friendly, high energy density, easy to handle and carry, and safe. With the advantages of high reliability, it is expected to become an ideal power source for miniaturized and portable devices. Oxygen reduction reaction (ORR) catalysts play an extremely important role in the above two batteries. [0003] At present, platinum-based noble metal oxygen reduction reaction catalysts are the core part of this type of battery. However, platinum-based noble meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/90Y02E60/50
Inventor 宋文波毛健新刘鹏
Owner JILIN UNIV
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