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Heterojunction photocatalyst for hydrogen production and alcohol oxidation by high-efficiency photocatalytic water-cracking

A photocatalyst, photocatalytic water technology, applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen and other directions, can solve the problems of high cost and poor activity of noble metal decoration, achieve mild conditions, improve hydrogen production performance, and prepare Simple process effect

Active Publication Date: 2018-12-14
FUZHOU UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to construct a novel p Type NiSe modified NiSe / TiO 2 p-n heterojunction and explore its activity in photocatalytic water splitting reactions to address TiO 2 Poor activity and high cost of noble metal modification in photocatalytic water splitting for hydrogen production

Method used

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  • Heterojunction photocatalyst for hydrogen production and alcohol oxidation by high-efficiency photocatalytic water-cracking
  • Heterojunction photocatalyst for hydrogen production and alcohol oxidation by high-efficiency photocatalytic water-cracking
  • Heterojunction photocatalyst for hydrogen production and alcohol oxidation by high-efficiency photocatalytic water-cracking

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preparation example Construction

[0017] The preparation steps of the present invention are as follows:

[0018] Dissolve a certain amount of nickel sulfate hexahydrate and sodium selenite in a molar ratio of 1:1 in 40mL of ethylene glycol solvent, then add a certain amount of titanium dioxide (commercial P25), stir well and transfer to a high-pressure reactor , kept at 180°C for 24 hours, and finally cooled down to room temperature naturally. The obtained samples were centrifuged and washed with deionized water and absolute ethanol, and dried in a vacuum oven to obtain a series of NiSe / TiO with different NiSe loadings. 2 heterojunction photocatalysts. Accurately weigh 50 mg of the synthesized powder catalyst and place it in a photo-splitting water reactor to test the hydrogen production performance of photo-splitting water.

Embodiment 1

[0020] Dissolve a certain amount of nickel sulfate hexahydrate and sodium selenite (29.06 μmoL) in 40 mL of ethylene glycol solvent at a molar ratio of 1:1, then add a certain amount of titanium dioxide (40 mg, commercial P25), and stir well Afterwards, it was transferred to a high-pressure reactor, kept at 180°C for 24 hours, and finally cooled down to room temperature naturally. The obtained samples were washed by centrifugation with deionized water and absolute ethanol, and dried in a vacuum oven to obtain NiSe / TiO with a NiSe loading of 1%. 2 heterojunction photocatalysts. Accurately weigh 50 mg of the synthesized powder catalyst and place it in a photo-splitting water reactor to test the hydrogen production performance of photo-splitting water.

Embodiment 2

[0022] Dissolve a certain amount of nickel sulfate hexahydrate and sodium selenite (87.2 μmoL) in a molar ratio of 1:1 in 40 mL of ethylene glycol solvent, then add a certain amount of titanium dioxide (40 mg, commercial P25), and stir well Afterwards, it was transferred to a high-pressure reactor, kept at 180°C for 24 hours, and finally cooled down to room temperature naturally. The obtained samples were washed by centrifugation with deionized water and absolute ethanol, and dried in a vacuum oven to obtain NiSe / TiO with a NiSe loading of 3%. 2 heterojunction photocatalysts. Accurately weigh 50 mg of the synthesized powder catalyst and place it in a photo-splitting water reactor to test the hydrogen production performance of photo-splitting water.

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Abstract

The invention discloses a heterojunction photocatalyst for hydrogen production and alcohol oxidation by high-efficiency photocatalytic water-cracking, and belongs to the field of photocatalyst preparation and application. According to the invention, nickel sulfate hexahydrate, sodium selenite and titanium dioxide are taken as reactants, glycol is taken as a solvent and a reducing agent, and then aNiSe / TiO2 heterojunction photocatalyst is synthesized according to a one-step solvothermal method. The heterojunction photocatalyst prepared by the invention has a photocatalytic hydrogen productionperformance 9 times higher than that of pure TiO2, and shows good stability in the long-cycle operation. Furthermore, simple alcohols are taken as sacrificial agents, and chemicals of high-value fuel(hydrogen), small molecular acids, aldehydes and the like are prepared through the photocatalytic water cracking under illumination of simulated sunlight. In addition, the heterojunction photocatalystused in the invention is green and simple in preparation method, rich in material sources, low in cost and stable in activity, and combines the small molecular alcohols as the sacrificial agents, sothat economic benefits of photocatalysis and the utilization rate of absorbed light energy can be greatly improved.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, and in particular relates to a heterojunction photocatalyst for high-efficiency photocatalytic water splitting to produce hydrogen and alcohol oxidation. Background technique [0002] The energy issue is one of the important issues related to the national economy and people's livelihood in today's international society. Around the research and development of renewable energy, governments and scientists are exploring in different fields. Since Fujishima and Honda discovered TiO in 1972 2 Since photocatalytic water splitting to produce hydrogen, the way to obtain the cleanest energy source—hydrogen through solar-driven water splitting has attracted great attention from scientists all over the world. TiO 2 As a widely studied photocatalyst, it has unique properties including biological and chemical inertness, stability, low cost, availability, and nontoxicity. At present, in order to imp...

Claims

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Application Information

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IPC IPC(8): B01J27/057C01B3/04
CPCC01B3/042B01J27/0573C01B2203/0277C01B2203/1058B01J35/39Y02E60/36
Inventor 黄彩进龚海生刘秋文
Owner FUZHOU UNIV
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