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One-step hydrothermal method for synthesizing nanoflake tungsten sulfide

A nano-flaky, hydrothermal synthesis technology, which is applied in the field of electrocatalytic hydrogen evolution, can solve the problems of increased energy consumption and achieve the effects of simple operation, mild conditions and high purity

Inactive Publication Date: 2014-05-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hydrogen production by electrolysis of water is one of the most promising and cleanest hydrogen production methods. However, due to the existence of hydrogen evolution overpotential, the energy consumption increases, so the development of highly active hydrogen evolution materials to improve hydrogen production efficiency has been extensively studied.

Method used

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  • One-step hydrothermal method for synthesizing nanoflake tungsten sulfide
  • One-step hydrothermal method for synthesizing nanoflake tungsten sulfide
  • One-step hydrothermal method for synthesizing nanoflake tungsten sulfide

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Effect test

Embodiment 1

[0022] The preparation steps of one-step hydrothermal synthesis of nano-flaky tungsten sulfide include: dissolving 10 mmol thiourea in 20 ml deionized water, transferring the solution to a stainless steel reactor with a volume of 30 ml lined with Teflon material, taking a piece of The size is 2×3 cm 2 The cleaned metal tungsten mesh was placed in the reaction kettle and reacted at 160°C for 24 h. After the reaction was completed, it was allowed to cool naturally. The product was washed several times with deionized water and ethanol, and dried to obtain the nanosheet Tungsten sulfide material. The existence of this structure can be verified by SEM pictures.

Embodiment 2

[0024] The preparation steps of one-step hydrothermal synthesis of nano-flaky tungsten sulfide include: dissolving 5 mmol thiourea in 25 ml deionized water, transferring the solution to a stainless steel reactor with a volume of 30 ml lined with polytetrafluoro material, taking a piece of The size is 2×3 cm 2 The cleaned metal tungsten mesh was placed in the reaction kettle and reacted at 180°C for 12 h. After the reaction, it was allowed to cool naturally. The product was washed several times with deionized water and ethanol, and dried to obtain the nanosheet Tungsten sulfide material. The existence of this structure can be verified by SEM pictures.

Embodiment 3

[0026] The preparation steps of one-step hydrothermal synthesis of nano-flaky tungsten sulfide include: dissolving 5 mmol thiourea in 25 ml deionized water, transferring the solution to a stainless steel reactor with a volume of 30 ml lined with polytetrafluoro material, taking a piece of The size is 2×3 cm 2 The cleaned metal tungsten mesh was placed in the reaction kettle and reacted at 200°C for 24 h. After the reaction was completed, it was allowed to cool naturally. The product was washed several times with deionized water and ethanol, and dried to obtain the nanosheet Tungsten sulfide material. The existence of this structure can be verified by SEM pictures.

[0027] The material obtained by the invention is applied to electrocatalyze hydrogen evolution. The three-electrode test system of the prepared tungsten sulfide nanosheets applied to electrocatalytic hydrogen evolution was carried out at normal temperature and pressure, in which the electrolyte was 0.5 mol / L sulf...

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Abstract

The invention relates to a one-step hydrothermal method for synthesizing nanoflake tungsten sulfide, and an application thereof, belonging to the field of electrocatalytic hydrogen evolution. The method takes use of metal tungsten mesh and thiourea as a tungsten source and a sulfur source respectively, and grows uniform nanoflake tungsten sulfide on the surface of the metal tungsten mesh through a hydrothermal reaction. The method is convenient for operation and mild in reaction conditions. The reaction can be finished in a liquid phase at a time, without after-treatment. The process equipment is simple; raw materials are easily available; a reaction period is short; and repeatability is high. The material presents excellent hydrogen evolution performance in electrocatalytic hydrogen evolution. When hydrogen evolution overpotential is 200 mV, electric current density is 2.53 mA / cm<2>; and when the overpotential is 300 mV, the electric current density can reach 32 mA / cm<2>. As a hydrogen evolution catalyst, the nanoflake tungsten sulfide has wide application prospects in developing sustainable clean energy.

Description

technical field [0001] The invention belongs to the field of electrocatalytic hydrogen evolution, and specifically relates to the synthesis of nano-flaky tungsten sulfide by a one-step hydrothermal method and its application. Background technique [0002] Hydrogen is a clean and recyclable substance, which is considered as an ideal energy carrier, which can be efficiently converted into usable effective energy without causing environmental problems. Hydrogen production by electrolysis of water is one of the most promising and cleanest hydrogen production methods. However, due to the existence of hydrogen evolution overpotential, the energy consumption increases, so the development of highly active hydrogen evolution materials to improve hydrogen production efficiency has been extensively studied. . [0003] Facing the challenges of energy crisis and environmental pollution that the world is facing today, people have found that electrocatalytic hydrogen evolution has the adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B01J27/047C25B1/04B82Y30/00B82Y40/00
CPCY02E60/36
Inventor 侯乙东徐燕丁正新戴文新付贤智
Owner FUZHOU UNIV
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