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Nano-tungsten oxide, one-step vapor phase reduction preparation method of nano-tungsten oxide and application of nano-tungsten oxide

A technology of tungsten oxide and oxide, which is applied in the direction of nanotechnology, nanotechnology, tungsten oxide/tungsten hydroxide, etc., can solve the problems of unachievable promotion, increased energy consumption, and scarce reserves, etc., and achieves easy application, simple operation, The effect of simple synthesis method

Inactive Publication Date: 2015-10-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.
The traditional electrode materials that can effectively reduce the hydrogen evolution overpotential are mainly precious metals such as Pt and Pd, but these metal materials are scarce on the earth and expensive, and cannot be widely promoted.

Method used

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  • Nano-tungsten oxide, one-step vapor phase reduction preparation method of nano-tungsten oxide and application of nano-tungsten oxide
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  • Nano-tungsten oxide, one-step vapor phase reduction preparation method of nano-tungsten oxide and application of nano-tungsten oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1, preparation of tungsten oxide

[0034] 1.0g WO 3 Disperse in 35mL of absolute ethanol and ball mill for 24 hours, put the ball milled powder into the quartz ark; push the quartz ark into the central hot zone of the tube furnace, and seal the flange; pass the hydrogen and argon through the rotameter After metering (hydrogen gas flow rate is 0.01L / min, argon gas flow rate is 0.09L / min) fully mixed and then enters the tube furnace; the temperature of the tube furnace is raised to 500 °C at a rate of 5 °C / min, and the temperature is treated for 30 min; then, Naturally cool to room temperature, take out the quartz ark, wash the contents of the ark several times with distilled water and absolute ethanol, and dry the product in an oven at 60°C for 3 hours to obtain nano-sized tungsten oxide powder.

[0035] Step 2. Performance Characterization Test

[0036] Disperse 0.02mg of tungsten oxide powder in a mixed solvent of water and ethanol containing Nafion solution to ...

Embodiment 2

[0049] 0.5g WO 3 Disperse in 10mL of absolute ethanol and ball mill for 48 hours, put the ball-milled powder into the quartz ark; push the quartz ark into the central hot zone of the tube furnace, and seal the flange; pass the hydrogen and argon through the rotameter After metering (hydrogen gas flow rate is 0.03L / min, argon gas flow rate is 0.27L / min) and fully mixed, enter the tube furnace; heat the tube furnace to 300 °C at a rate of 5 °C / min, and treat at constant temperature for 60 min; then, Naturally cool to room temperature, take out the quartz ark, wash the contents of the ark several times with distilled water and absolute ethanol, and dry at 100°C for 1 hour to obtain nano-sized tungsten oxide powder. Features and properties are similar to Example 1.

Embodiment 3

[0051] 2.0g WO 3 Disperse in 50mL of absolute ethanol and ball mill for 1 hour, put the ball-milled powder into the quartz ark; push the quartz ark into the central hot zone of the tube furnace, and seal the flange; pass the hydrogen and argon through the rotameter After metering (hydrogen gas flow rate is 0.005L / min, argon gas flow rate is 0.045L / min) fully mixed and then enters the tube furnace; the temperature of the tube furnace is raised to 600 °C at a rate of 5 °C / min, and the constant temperature is treated for 120 min; then, Naturally cool to room temperature, take out the quartz ark, wash the contents of the ark several times with distilled water and absolute ethanol, and dry at 100°C for 1 hour to obtain nano-sized tungsten oxide powder. Features and properties are similar to Example 1.

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Abstract

The invention discloses a nano-tungsten oxide, a one-step vapor phase reduction preparation method of the nano-tungsten oxide and application of the nano-tungsten oxide. The nano-tungsten oxide takes tungsten trioxide as a tungsten source, and the tungsten trioxide is reduced into nano-scale tungsten oxide WO2.9 in stoichiometric ratio by a vapor phase reduction method; the method has the advantages of simpleness and convenience in operation, simple technical equipment, easily-obtained raw materials, lower preparation cost, short reaction cycle and high repeatability; the material is applied to electrocatalysis hydrogen evolution and shows the excellent hydrogen evolution performance; when the hydrogen evolution overpotential is -70mV, the current density is 8 to 12mA / cm<2>; when the overpotential is -94mV, the current density can reach 15 to 25mA / cm<2>. Not only can the nano-tungsten oxide disclosed by the invention be used as a hydrogen evolution catalyst, but also can be used for hydrogen evolution materials in the chlor-alkali industry, a water electrolysis process, water-electrolytic hydrogen production by using solar energy, electrochemical hydrogen production and other systems.

Description

technical field [0001] The invention belongs to a kind of tungsten oxide WO with substoichiometric ratio 2.9 Nanomaterials, which are prepared by a one-step gas phase reduction method, have excellent performance in electrocatalytic hydrogen evolution, and also have potential application performance in other energy development and environmental protection fields. Background technique [0002] With the progress of the times and the development of science and technology, energy has become an important factor affecting human society. At present, traditional energy sources such as coal, oil, and natural gas still play a pivotal role in the world's economic development, but the reserves of these resources on the earth are very limited, and the energy crisis has become an urgent problem for human beings to solve. Among many energy sources, hydrogen is a clean and recyclable substance, and is considered as an ideal energy carrier, which can be efficiently converted into usable effe...

Claims

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Application Information

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IPC IPC(8): C01G41/02B82Y30/00
Inventor 杨化桂李宇航
Owner EAST CHINA UNIV OF SCI & TECH
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