Graphite oxide acetylene nanosheet achieving water photolysis oxygen generation under visible light and preparation method and application thereof

A technology of graphyne and nanosheets, which is applied in the field of graphyne oxide nanosheets and its preparation, can solve the problems of unresearched, complex preparation process, and unfavorable large-scale application of visible light water splitting oxygen generation, and achieve excellent photolysis water oxygen generation performance , Improve light absorption, high-performance visible light water splitting and oxygen production

Active Publication Date: 2019-06-28
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

The preparation process of this composite catalyst is complex, and in order to improve performance, platinum nanoparticles are deposited on its surface, which is not conducive to large-scale application
[0005] Therefore, instead of using other co-catalysts or semiconductors to combine with graphyne, the bandgap structure of graphyne can be adjusted simply by modifying functional groups or changing the skeleton composition, and its further application in visible light splitting water to generate oxygen has not yet been studied.

Method used

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  • Graphite oxide acetylene nanosheet achieving water photolysis oxygen generation under visible light and preparation method and application thereof
  • Graphite oxide acetylene nanosheet achieving water photolysis oxygen generation under visible light and preparation method and application thereof
  • Graphite oxide acetylene nanosheet achieving water photolysis oxygen generation under visible light and preparation method and application thereof

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[0030] The invention provides a preparation method of graphyne oxide nanosheets for photolysis of water to generate oxygen under visible light, comprising the following steps:

[0031] A) oxidizing graphyne by mixed strong acid to obtain graphyne oxide;

[0032] B) Exfoliating the graphyne oxide by liquid-phase ultrasonic stripping, and obtaining graphyne oxide nanosheets after centrifugation.

[0033] The present invention uses graphyne as a raw material to prepare graphyne oxide nanosheets, wherein the graphyne is prepared according to the following method:

[0034] The acetone solution of hexaynylbenzene is added to the mixed solution of acetone, pyridine and tetramethylethylenediamine dispersed with copper flakes, and nitrogen is used as a protective gas, and the reaction is carried out under heating conditions to obtain graphyne.

[0035] The concentration of hexaynylbenzene in the acetone solution of hexaynylbenzene is 0.8 mg / ml-1.0 mg / ml.

[0036] The volume ratio of ...

Embodiment 1

[0065] Mix 100 milliliters of acetone, 5 milliliters of pyridine and 1 milliliter of tetramethylethylenediamine to form a solution, add 50 mg of clean copper, and then, under the protection of nitrogen atmosphere, mix 50 milliliters of six The acetone solution of alkynylbenzene was injected into the above solution at a rate of 25 ml / hour using a syringe pump. The mixed system was reacted for 24 hours in an oil bath at 50° C. under the protection of a nitrogen atmosphere. Finally, the sample is fully washed with hot acetone, pyridine, and N,N-dimethylformamide in sequence to remove unreacted monomers and oligomers to obtain a graphyne sample.

Embodiment 2

[0067] At 0°C, 5 ml of concentrated sulfuric acid and 10 ml of concentrated nitric acid were mixed, and then 50 mg of graphyne sample was slowly added to the mixture. The reaction was stirred magnetically at room temperature for 6 hours. Dilute the dispersion with 200 ml of deionized water, collect the sample by centrifugation, wash thoroughly with deionized water until the pH of the separated liquid is neutral, and dry it in vacuum at room temperature to obtain a sample of graphyne oxide.

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Abstract

The invention provides a preparation method of a graphite oxide acetylene nanosheet achieving water photolysis oxygen generation under visible light. The method for preparing the graphite oxide acetylene nanosheet is simple, efficient and low in cost. The prepared graphite oxide acetylene nanosheet has abundant oxygen-containing functional groups on the surface and excellent dispersion in water, and is beneficial to improvement of light absorption; the graphite oxide acetylene nanosheet has the uniform size and ultra-thin thickness, and is beneficial to separation and transmission of photo-induced electrons and holes, and the performance of water pohotolysis oxygen generation under the visible light is improved. The prepared graphite oxide acetylene nanosheet material has good absorption in the visible light range, and the energy band structure meets the requirement of catalyzing water for decomposition to generate oxygen under visible light irradiation, and thus high-performance visible light water pohotolysis oxygen generation is achieved. In addition, the graphite oxide acetylene nanosheet material still show the excellent water pohotolysis oxygen generation performance under irradiation of near-infrared light (lambda=660 nm).

Description

technical field [0001] The invention belongs to the technical field of photolysis of water to produce oxygen, and in particular relates to a graphyne oxide nanosheet for photolysis of water to produce oxygen under visible light and a preparation method thereof. Background technique [0002] Photocatalytic water splitting using semiconductor catalysts is an efficient way to convert solar energy into chemical energy. At present, the biggest obstacle to photocatalytic water splitting is the half-reaction of water oxidation. The oxidation of water to generate oxygen requires the transfer of multiple electrons and a high overpotential. A kinetically lagging process. Therefore, it has been a hot spot and focus in this research field to seek a new type of efficient and low-cost catalyst for visible light water splitting and oxygen production. [0003] Existing catalysts for visible light water splitting and oxygen generation are mainly metal semiconductors such as silver phosphate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18C01B13/02
Inventor 徐航勋麻晓宇张震张颖
Owner UNIV OF SCI & TECH OF CHINA
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