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Tungsten disulfide/niobium disulfide heterojunction nanosheet

A technology of niobium disulfide and tungsten disulfide, which is applied in the field of catalytic materials for electrochemical hydrogen evolution, can solve the problems of high price and high energy consumption, and achieve the effects of good stability, good performance and simple synthesis steps

Active Publication Date: 2018-07-27
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy consumption is high and the price is high, and the catalysts for electrolytic hydrogen production mostly use noble metals (such as Pt, Pd), so the development of low-cost and resource-rich high-efficiency hydrogen evolution catalytic materials has become one of the current research priorities

Method used

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  • Tungsten disulfide/niobium disulfide heterojunction nanosheet
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  • Tungsten disulfide/niobium disulfide heterojunction nanosheet

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Effect test

Embodiment 1

[0038] Nb 2 / WS 2 Preparation of heterojunction nanosheets (for a schematic diagram of the preparation process, see figure 1 a):

[0039](1) Using a tube furnace with three temperature zones, low-pressure chemical vapor deposition is used, sulfur powder and tungsten trioxide powder are used as reaction precursors, and sapphire single crystal is used as a growth substrate. Sulfur powder, tungsten oxide powder, and sapphire single crystal substrate were put into the quartz tube from left to right in turn. Before the reaction, the entire growth system was cleaned with a large amount of Ar gas. The flow rate of Ar gas was 500 sccm, and the gas cleaning time was 25 minutes.

[0040] Use a mechanical pump to keep the entire reaction system in a low-pressure state. The heating temperature of the sulfur powder is 100°C, the heating temperature of the tungsten oxide and the substrate are respectively 880°C, and the heating time is 35 minutes and maintained for 30 minutes. 5 sccm of ...

Embodiment 2

[0047] Nb 2 / WS 2 Preparation of heterojunction nanosheets:

[0048] (1) Using a tube furnace with three temperature zones, low-pressure chemical vapor deposition is used, sulfur powder and tungsten trioxide powder are used as reaction precursors, and sapphire single crystal is used as a growth substrate. Sulfur powder, tungsten oxide powder, and sapphire single crystal substrate were put into the quartz tube from left to right in turn. Before the reaction, the entire growth system was cleaned with a large amount of Ar gas. The flow rate of Ar gas was 500 sccm, and the gas cleaning time was 25 minutes.

[0049] Use a mechanical pump to keep the entire reaction system in a low-pressure state. The heating temperature of the sulfur powder is 100°C, the heating temperature of the tungsten oxide and the substrate are respectively 880°C, and the heating time is 35 minutes and maintained for 35 minutes. 5 sccm of hydrogen and 80 sccm of argon, cooled to room temperature after growt...

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Abstract

The invention provides a tungsten disulfide / niobium disulfide heterojunction nanosheet. The tungsten disulfide / niobium disulfide heterojunction nanosheet grows on the surface of a substrate, wherein afirst upward layer on the substrate is a single-layer tungsten disulfide layer; the surface of the tungsten disulfide layer is at least partially covered with the niobium disulfide layer; and the thickness of the niobium disulfide layer is 4 to 6 nm. The invention also provides preparation and application of the tungsten disulfide / niobium disulfide heterojunction nanosheet. The NbS2 / WS2 heterojunction nanosheet has the advantages stable chemical properties, good crystallinity, great electrochemical active area and the like, presents good electrochemical hydrogen evolution performance and goodstability, and can be applied to hydrogen production by electrolysis of water and related fields.

Description

technical field [0001] The invention belongs to the field of catalytic materials, in particular to a catalytic material for electrochemical hydrogen evolution and its preparation and application. Background technique [0002] The use of fossil fuels such as coal, oil and natural gas will bring serious environmental problems, and the reserves of coal, oil and natural gas are limited and difficult to regenerate. Energy shortage is a major challenge facing the current society. Therefore, vigorously developing clean and renewable energy is an important issue before people. Hydrogen has a high combustion calorific value, and the combustion product is only water, which is an important clean energy. However, in order to realize the practical utilization of hydrogen energy, many problems need to be solved. One of the bottleneck problems is how to efficiently produce fuel hydrogen. [0003] Compared with petroleum reforming and cracking hydrogen production, water electrolysis hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/047B01J35/02B82Y30/00B82Y40/00C25B1/04C25B11/06
CPCC25B1/04B82Y30/00B82Y40/00B01J27/047C25B11/091B01J35/00B01J35/30B01J35/33Y02E60/36
Inventor 何军张玉
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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