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Preparation method and use of silicon carbide nano-wire catalyst for making hydrogen

A technology of silicon carbide nanowires and catalysts, applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc., can solve problems such as few reports on photolysis of water.

Inactive Publication Date: 2008-11-19
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a new type of photocatalytic material, SiC nanowires have just started to degrade organic matter, and there are few reports on the photolysis of water.

Method used

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  • Preparation method and use of silicon carbide nano-wire catalyst for making hydrogen
  • Preparation method and use of silicon carbide nano-wire catalyst for making hydrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix silicon powder and silicon dioxide (the molar ratio is 1:1) and evenly place it on the bottom of the graphite crucible, spread a layer of carbon nanotube powder on the surface of the mixture of silicon powder and silicon dioxide, and cover the graphite crucible Put a lid made of graphite flakes into a high-temperature vacuum sintering furnace, evacuate to 0.1Pa, fill with argon protection, heat to 1500°C, and keep at this temperature for 6 hours. After the heat preservation was over, the heating power was turned off, and the furnace was naturally cooled to room temperature under the condition of circulating water cooling, and the sintering furnace was opened to take out the sample, and it was found that the black carbon nanotubes inside the crucible had turned into a layer of light green product.

[0021] X-ray diffraction and energy spectrum analysis showed that the product was β-SiC nanowires. The product was placed under a field emission scanning electron microsc...

Embodiment 2

[0024] Mix silicon powder and silicon dioxide (the molar ratio is 1:1) and evenly place it on the bottom of the graphite crucible, spread a layer of carbon nanotube powder on the surface of the mixture of silicon powder and silicon dioxide, and cover the graphite crucible Put a lid made of graphite flakes into a high-temperature vacuum sintering furnace, evacuate to 10Pa, fill with argon protection, heat to 1100°C, and keep at this temperature for 10 hours. After the heat preservation was over, the heating power was turned off, and the furnace was naturally cooled to room temperature under the condition of circulating water cooling, and the sintering furnace was opened to take out the sample, and it was found that the black carbon nanotubes inside the crucible had turned into a layer of light green product. X-ray diffraction and energy spectrum analysis showed that the product was β-SiC nanowires. The morphology of the product was observed under a field emission scanning elect...

Embodiment 3

[0027] Mix silicon powder and silicon dioxide (the molar ratio is 1:1) and evenly place it on the bottom of the graphite crucible, spread a layer of carbon nanotube powder on the surface of the mixture of silicon powder and silicon dioxide, and cover the graphite crucible A lid made of graphite flakes is placed in a high-temperature vacuum sintering furnace and vacuumed to 10 -3Pa, filled with argon protection, heated to 1600°C, and kept at this temperature for 1 hour. After the heat preservation was over, the heating power was turned off, and the furnace was naturally cooled to room temperature under the condition of circulating water cooling, and the sintering furnace was opened to take out the sample, and it was found that the black carbon nanotubes inside the crucible had turned into a layer of light green product. X-ray diffraction and energy spectrum analysis showed that the product was β-SiC nanowires. The product was placed under a field emission scanning electron mic...

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Abstract

The invention discloses a preparation method of hydrogen production used silicon carbide nano-wire catalyst and the application thereof. Silicon powder, silicon dioxide powder and carbon nano-tube are adopted as the raw materials for preparing the SiC nano-wire, The SiC nano-wire which is corroded by the mixed liquor of hydrofluoric acid and aquafortis is mixed with water for preparing hydrogen gas, and the mass ratio of the mixed liquor to the SiC nano-wire is 100-10. In the catalyst of the invention, SiC has ideal band gap; the bottom of the conduction band is mainly composed of the 3s track of Si, the value band edge is mainly composed of the 2p track of C, the electric potential of the conduction band is slightly negative than the electric potential of the hydrogen electrode EH+ / H2, and the electric potential of the value band is slightly positive than the electric potential of the oxygen electrode EO2 / H2O, the thermodynamic requirement of water photolysis is met, the close packing of the Si-C diatomic layer during the SiC crystal growth process is easy to cause stacking fault, and the stacking fault is a novel quantum well structure with an ideal contact interface. In addition, the catalyst also has the advantages of steady chemical property, no toxicity, renewable utilization, etc.

Description

technical field [0001] The invention relates to a preparation method and application of a silicon carbide nanowire catalyst for hydrogen production. Background technique [0002] Hydrogen production by semiconductor photocatalytic splitting of water, conversion of solar energy into chemical energy, and its bright application prospects have attracted more and more attention to research in this field. Especially since Fujishima in the n-type semiconductor TiO 2 Since the photoelectrocatalytic decomposition of water was found on the electrode (Nature, 1972, 238: 37-38), TiO 2 , ZnO, RuS 2 Semiconductor photocatalysts such as compound semiconductors and tantalates have received great attention and been extensively studied (Nature, 2001, 414: 625-627; J.Photochem.Photobiol., A: Chemistry, 1997, 108: 1- 35). The preparation and application of highly active photocatalysts with high quantum efficiency and the ability to fully utilize solar energy have become a hot topic of wides...

Claims

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Application Information

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IPC IPC(8): B01J27/224C23C16/42C23C16/32C01B3/04
CPCY02E60/364Y02E60/36
Inventor 陈建军潘颐林晶王耐艳金达莱高林辉
Owner ZHEJIANG SCI-TECH UNIV
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