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Cobalt-doped tungsten sulfide nanosheets, preparation method thereof and application of electrochemical hydrogen evolution

A technology of tungsten sulfide and nanosheets, applied in chemical instruments and methods, inorganic chemistry, cobalt compounds, etc., can solve the problems of destroying active sites and reducing catalytic efficiency

Active Publication Date: 2017-12-05
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co doping to WS 2 lattice, can significantly enhance the catalytic performance, however, the usual bimetallic oxide sulfidation method tends to produce CoS x impurities, rather than Co-W-S compounds, and, similar to Co 9 S 8 The formation of the phase will severely damage the active sites and reduce their catalytic efficiency.
Therefore, how to dope Co into WS conveniently and quickly 2 Formation of Co in the lattice x W (1-x) S 2 , while not generating irrelevant CoS x is a challenging subject

Method used

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  • Cobalt-doped tungsten sulfide nanosheets, preparation method thereof and application of electrochemical hydrogen evolution
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  • Cobalt-doped tungsten sulfide nanosheets, preparation method thereof and application of electrochemical hydrogen evolution

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Experimental program
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Effect test

Embodiment 1

[0072] co x W (1-x) S 2 Preparation of nanosheets (see the schematic diagram of the preparation process Figure 3a ):

[0073] (1) Ultrasonic cleaning of the W foil with deionized water, ethanol, and acetone, followed by N 2 Blow dry, place in a furnace for annealing at 500°C for 30 minutes, and put 1.56g oxalic acid (H 2 C 2 o 4 2H 2 O), 0.2g rubidium sulfate (Rb 2 SO 4 ) and 313 μL nitric acid (HNO3 ) mixed solution in a reactor (50mL) heated to 150°C and kept for 72h. After the obtained sample was washed and dried, it was annealed in a furnace at 500°C for 30min to obtain WO grown on a W substrate. 3 nano tree;

[0074] (2) Sulfur powder (S) and WO obtained in step (1) 3 The nano-trees are respectively placed in the upstream and downstream central temperature zones of the dual-temperature zone tubular reaction furnace. After cleaning the quartz tube with argon (Ar), the furnace temperature in the upstream central temperature zone is raised to 150°C, and the furna...

Embodiment 2

[0085] co x W (1-x) S 2 Preparation of nanosheets (for the schematic diagram, see Figure 3a ):

[0086] (1) Ultrasonic cleaning of the W foil with deionized water, ethanol, and acetone, followed by N 2 Blow dry, place in a furnace for annealing at 450°C for 45 minutes, and put 1.17g oxalic acid (H 2 C 2 o 4 2H 2 O), 0.08g rubidium sulfate (Rb 2 SO 4 ) and 209 μL nitric acid (HNO 3 ) mixed solution in a reactor (50mL) heated to 145°C and kept for 72h. After the obtained sample was washed and dried, it was annealed in a furnace at 465°C for 40min to obtain WO grown on a W substrate. 3 nano tree;

[0087] (2) Sulfur powder (S) and WO obtained in step (1) 3 The nano-trees are respectively placed in the upstream and downstream central temperature zones of the dual-temperature zone tubular reaction furnace. After cleaning the quartz tube with argon (Ar), the furnace temperature in the upstream central temperature zone is raised to 100°C, and the furnace temperature in t...

Embodiment 3

[0093] co x W (1-x) S 2 Preparation of nanosheets (for the schematic diagram, see Figure 3a ):

[0094] (1) Ultrasonic cleaning of the W foil with deionized water, ethanol, and acetone, followed by N 2 Blow dry, place in a furnace for annealing at 520°C for 30 minutes, and put 1.95g oxalic acid (H 2 C 2 o 4 2H 2 O), 0.32g rubidium sulfate (Rb 2 SO 4 ) and 626 μL nitric acid (HNO 3 ) mixed solution in a reactor (50mL) was heated to 165°C and kept for 60h. After the obtained sample was washed and dried, it was annealed in a furnace at 520°C for 30min to obtain WO grown on a W substrate. 3 nano tree;

[0095] (2) Sulfur powder (S) and WO obtained in step (1) 3 The nano-trees are respectively placed in the upstream and downstream central temperature zones of the dual-temperature zone tubular reaction furnace. After cleaning the quartz tube with argon (Ar), the furnace temperature in the upstream central temperature zone is raised to 180°C, and the furnace temperature ...

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Abstract

The invention relates to a method for preparing cobalt-doped tungsten sulfide nano sheets by a chemical vapor deposition method, and an application of the cobalt-doped tungsten sulfide nano sheets in electrochemical hydrogen evolution, and belongs to the technical field of inorganic semiconductor nanomaterials. With tungsten sulfide nano sheets and cobalt oxide nanowires as raw materials, the cobalt-doped tungsten sulfide nano sheets are prepared by a chemical vapor deposition (CVD) method. The synthesized CoxW(1-x)S2 nano sheets have the advantages of stable chemical properties, good crystallinity, large electrochemical active area and the like; at the same time, the method has the advantages of simple preparation process, convenient operation and low cost; the cobalt-doped tungsten sulfide nano sheets have good electrochemical hydrogen evolution performance and good stability, and can be used in the related field of water electrolysis for hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of inorganic semiconductor nanomaterials, and relates to cobalt-doped tungsten sulfide nanosheets, a preparation method and application thereof, in particular to cobalt-doped tungsten sulfide nanosheets, a preparation method thereof, and an application in the field of electrochemical hydrogen evolution. Background technique [0002] Facing the global energy crisis and related environmental problems, hydrogen is considered as the best green energy carrier because of its high calorific value and the combustion product is water. Today, the vast majority of hydrogen is produced from hydrocarbon steam reforming, a process that is not only environmentally harmful but also consumes non-renewable mineral resources. Water is abundant on earth, and it has been found that hydrogen gas can be produced by electrolysis of water. Platinum (Pt) catalysts can efficiently perform hydrogen evolution reaction (HER) in water el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00C01G51/00B82Y30/00C25B1/04C25B11/06
CPCC01G41/006C01G51/006C01P2002/01C01P2002/80C01P2002/82C01P2002/85C01P2004/03C01P2004/04C01P2004/62C01P2004/64C01P2006/40C01P2006/80C25B1/04C25B11/04Y02E60/36
Inventor 何军陶非克·艾哈迈德·希法程中州
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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