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Al2O3 modified array TiO2 nanowire and method for photoelectrocatalysis water decomposition hydrogen production

A technology of nanowires and arrays, applied in the field of photocatalysis, to achieve large surface area, improve photocatalytic performance, and increase the rate

Active Publication Date: 2017-03-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, TiO 2 It is an ideal photocatalytic water splitting material. After decades of development, various modification methods have been used to improve its catalytic efficiency. ALD technology has been used in the modification of photocatalysts, and can improve photocatalytic efficiency, but by ALD technique on TiO 2 Depositing Al on the surface of nanowires 2 o 3 Atomic layer, efficient enhancement of TiO through surface passivation 2 There is no special report on the photocatalytic water splitting of nanowires to produce hydrogen

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Embodiment 1

[0057] This embodiment provides an Al 2 o 3 Modified Array TiO 2 Nanowire photocatalyst, its preparation method specifically comprises the following steps:

[0058] The carbon cloth was ultrasonically cleaned in acetone, distilled water, and absolute ethanol in sequence. Prepare a n-hexane solution of titanium tetrachloride with a concentration of 0.05mol / L, soak the cleaned carbon cloth in it, and let it stand for 10 hours; take out the carbon cloth and put it in a tube furnace, and raise the temperature from 30°C at 4°C / min To 500°C, keep the temperature at 500°C for 30 minutes, and make a carbon cloth with a good seed layer. In a 200ml polytetrafluoroethylene reaction kettle, add toluene, tetrabutyl titanate, concentrated hydrochloric acid (that is, concentrated hydrochloric acid with a mass concentration of 37%), and titanium tetrachloride dropwise in sequence, and stir well, wherein toluene, tetrabutyl titanate The volume ratio of butyl ester, concentrated hydrochlori...

Embodiment 2

[0061] This embodiment provides an Al 2 o 3 Modified Array TiO 2 Nanowire photocatalyst, its preparation method specifically comprises the following steps:

[0062] The carbon cloth was ultrasonically cleaned in acetone, distilled water, and absolute ethanol in sequence. Prepare a n-hexane solution of titanium tetrachloride with a concentration of 0.05mol / L, soak the cleaned carbon cloth in it, and let it stand for 10 hours; take out the carbon cloth and put it in a tube furnace, and raise the temperature from 30°C at 4°C / min To 500°C, keep the temperature at 500°C for 30 minutes, and make a carbon cloth with a good seed layer. In a 200ml polytetrafluoroethylene reaction kettle, add toluene, tetrabutyl titanate, concentrated hydrochloric acid (that is, concentrated hydrochloric acid with a mass concentration of 37%), and titanium tetrachloride dropwise in sequence, and stir well, wherein toluene, tetrabutyl titanate The volume ratio of butyl ester, concentrated hydrochlori...

Embodiment 3

[0066] This embodiment provides an Al 2 o 3 Modified Array TiO 2 Nanowire photocatalyst, its preparation method specifically comprises the following steps:

[0067] The carbon cloth was ultrasonically cleaned in acetone, distilled water, and absolute ethanol in sequence. Prepare a n-hexane solution of titanium tetrachloride with a concentration of 0.01mol / L, soak the cleaned carbon cloth in it, and let it stand for 10 hours; take out the carbon cloth and put it in a tube furnace, and raise the temperature from 30°C at 4°C / min To 500°C, keep the temperature at 500°C for 30 minutes, and make a carbon cloth with a good seed layer. In a 200ml polytetrafluoroethylene reaction kettle, add toluene, tetrabutyl titanate, concentrated hydrochloric acid (that is, concentrated hydrochloric acid with a mass concentration of 37%), and titanium tetrachloride dropwise in sequence, and stir well, wherein toluene, tetrabutyl titanate The volume ratio of butyl ester, concentrated hydrochlori...

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Abstract

The invention provides an Al2O3 modified array TiO2 nanowire and a method for photoelectrocatalysis water decomposition hydrogen production. The Al2O3 modified array TiO2 nanowire comprises a carbon cloth substrate, an array TiO2 nanowire body growing on the carbon cloth substrate and Al2O3 layers obtained by carrying out atomic layer deposition on the surface of the array TiO2 nanowire body, and the number of the Al2O3 layers ranges from 1 to 20. A TiO2 nanowire array uniform in morphology directly grows on carbon cloth through a liquid phase hydro-thermal synthesis method, then TMA and H2O are used as precursors to evenly deposit an Al2O3 atom layer on the surface of the nanowire, and a prepared material has good photoelectrocatalysis hydrogen production performance. In addition, the method for photoelectrocatalysis water decomposition hydrogen production with the Al2O3 modified array TiO2 nanowire as a catalyst is provided.

Description

technical field [0001] The present invention relates to an Al 2 o 3 Modified Array TiO 2 The nanowire and its preparation method also relate to a method for producing hydrogen by photoelectrically decomposing water, belonging to the technical field of photocatalysis. Background technique [0002] In today's society, energy and environmental problems are becoming more and more prominent, and it is imperative to develop cleaner renewable energy sources. The use of clean and renewable solar photocatalytic water splitting to produce hydrogen is an ideal way to solve the problem. In 1972, Japanese scientists Fujishima and Honda discovered TiO 2 The electrode can decompose water to produce hydrogen under ultraviolet light, thus opening the TiO 2 Application research of photocatalysis. TiO 2 It is the earliest n-type semiconductor studied by scientists. It is cheap, non-toxic and environmentally friendly, and has become an ideal research object for semiconductor photocatalysi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06C25B11/12C23C28/04B01J21/06
CPCC23C28/042C25B1/04B01J21/063C25B11/057C25B11/051C25B11/091B01J35/39Y02E60/36
Inventor 姜桂元王雅君赵震白维坤韩善磊王海全徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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