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Nickel-cobalt-tungsten polysulfide bifunctional catalyst with core-shell spherical structure as well as preparation method and application of nickel-cobalt-tungsten polysulfide bifunctional catalyst

A catalyst and sulfide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of slow electron transfer rate, single-component material catalytic activity tends to bottleneck, etc., to achieve preparation Short process, excellent catalytic activity and hydrogen production performance, and high photoelectric conversion efficiency

Active Publication Date: 2021-03-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still many problems when transition metal sulfide nanomaterials are applied in the field of DSSCs and electrolyzed water to produce hydrogen. For example, the improvement of the catalytic activity of single-component materials has become a bottleneck. Stability and cyclability issues have yet to be resolved

Method used

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  • Nickel-cobalt-tungsten polysulfide bifunctional catalyst with core-shell spherical structure as well as preparation method and application of nickel-cobalt-tungsten polysulfide bifunctional catalyst
  • Nickel-cobalt-tungsten polysulfide bifunctional catalyst with core-shell spherical structure as well as preparation method and application of nickel-cobalt-tungsten polysulfide bifunctional catalyst
  • Nickel-cobalt-tungsten polysulfide bifunctional catalyst with core-shell spherical structure as well as preparation method and application of nickel-cobalt-tungsten polysulfide bifunctional catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Disperse 50 mg of cobalt nitrate hexahydrate, 60 mg of nickel nitrate hexahydrate, and 12 mL of glycerin in 50 mL of isopropanol. After magnetic stirring at room temperature for 20 min, pour the mixture into a hydrothermal kettle. Under reaction 8 h. The final nickel-cobalt-glycerol precursor was collected by centrifugation, washed with ethanol several times, and then dried overnight in a vacuum oven at 60 °C. 80 mg nickel-cobalt-glycerol precursor, 75 mg ammonium tungstate and 375 mg thioacetamide were dissolved in 100 mL ethanol, and magnetically stirred at room temperature for 20 min. Then transferred to a hydrothermal kettle for hydrothermal reaction at 160 °C for 8 h. After centrifugal washing and drying, the product was placed in the center of a porcelain boat, heated to 500 °C in a tube furnace, kept for 1 h, and the heating rate was 1 °C min −1 , and finally get the core-shell spherical structure of Co 9 S 8 -Ni 3 S 2 @WS 2 catalyst.

Embodiment 2

[0035] Disperse 50 mg cobalt nitrate hexahydrate, 50 mg nickel nitrate hexahydrate, 20 mL glycerin in 50 mL isopropanol, stir magnetically at room temperature for 20 min, pour the mixture into a hydrothermal kettle, and heat at 180 °C Under reaction for 10 h. The final nickel-cobalt-glycerol precursor was collected by centrifugation, washed with ethanol several times, and then dried overnight in a vacuum oven at 60 °C. 75 mg nickel-cobalt-glycerol precursor, 75 mg ammonium tungstate and 375 mg thioacetamide were dissolved in 75 mL ethanol, and magnetically stirred at room temperature for 20 min. Then transferred to a hydrothermal kettle for hydrothermal reaction at 180 °C for 12 h. After centrifugal washing and drying, the product was placed in the center of a porcelain boat and heated to 600 °C in a tube furnace for 2 h at a heating rate of 2 °C min −1 , and finally get the core-shell spherical structure of Co 9 S 8 -Ni 3 S 2 @WS 2 catalyst.

Embodiment 3

[0037] Disperse 50 mg cobalt nitrate hexahydrate, 80 mg nickel nitrate hexahydrate, and 15 mL glycerin in 70 mL isopropanol, stir magnetically at room temperature for 20 min, pour the mixture into a hydrothermal kettle, and heat at 170 °C Under reaction for 12 h. The final nickel-cobalt-glycerol precursor was collected by centrifugation, washed with ethanol several times, and then dried overnight in a vacuum oven at 60 °C. 85 mg nickel-cobalt-glycerol precursor, 75 mg ammonium tungstate and 375 mg thioacetamide were dissolved in 100 mL ethanol, and magnetically stirred at room temperature for 20 min. Then transferred to a hydrothermal kettle for hydrothermal reaction at 180 °C for 12 h. After centrifugal washing and drying, the product was placed in the center of the porcelain boat and heated to 700 °C in a tube furnace for 2 h at a heating rate of 2 °C min −1 , and finally get the core-shell spherical structure of Co 9 S 8 -Ni 3 S 2 @WS 2 catalyst.

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Abstract

The invention discloses a preparation method of a nickel-cobalt-tungsten polysulfide bifunctional catalyst with a core-shell spherical structure. The method comprises the following steps: firstly, dissolving a cobalt salt, a nickel salt and glycerol in a specific solvent, then putting a mixed solution into a stainless steel high-pressure reaction kettle taking polytetrafluoroethylene as a lining,carrying out heating reaction for a period of time, and then carrying out centrifugal drying to obtain a nickel-cobalt glycerol precursor; and carrying out tungsten doping and vulcanization treatmenton the precursor, ammonium tungstate and thioacetamide under a solvothermal reaction condition to finally obtain the quaternary tungsten sulfide doped cobalt nickel sulfide Co9S8-Ni3S2@WS2 catalyst. The preparation method has the advantages of easily available raw materials, low cost, simple process, short reaction time, unique catalyst morphology, high specific surface area and excellent electrocatalytic performance, can be applied to dye-sensitized solar cells, has photoelectric efficiency of 9.67%, and has good application prospects in the field of water electrolysis hydrogen production.

Description

technical field [0001] The invention belongs to the field of preparation of catalyst materials, in particular to a nickel-cobalt-tungsten polysulfide bifunctional catalyst (Co 9 S 8 -Ni 3 S 2 @WS 2 ) and its preparation method and application. Background technique [0002] With the development of the economy, energy and environmental issues are becoming more and more prominent. Therefore, the development of alternative and renewable green energy has become a top priority. As one of the cleanest energy sources, solar energy is considered to have great potential in the development and utilization of new energy due to its characteristics of being easy to collect and inexhaustible. At the same time, hydrogen energy has attracted much attention because of its non-toxic and environmentally friendly, abundant resources, high energy density, and various forms of utilization. It is known as the most ideal new energy in the 21st century. [0003] Dye-sensitized solar cells (DSSC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/049B01J35/00H01M14/00
CPCB01J27/049H01M14/005B01J35/396B01J35/33
Inventor 钱兴陈思颜刘林春
Owner FUZHOU UNIV
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