Graphene-based composite as well as preparation method and application thereof

A composite material, graphene-based technology, applied in the fields of photocatalytic materials and hydrogen storage materials, can solve the problems of increasing the occurrence of reverse reactions, the inability to perform large-scale implementation of photocatalytic splitting of water for hydrogen production, and the difficulty of removing, collecting and storing, and achieving efficient collection, Good light absorption ability, strong binding energy effect

Active Publication Date: 2019-05-28
合肥机数量子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The shorter distance between active sites increases the probability of the reverse reaction, and also provides the opportunity for the removal of oxygen and the collection and storage of pure H 2 brings difficulties
[0005] Therefore, in the design and development of efficient hydrogen production, purification of H 2 Before there is a safe hydrogen storage method, photocatalytic water splitting to produce hydrogen will not be able to be implemented on a large scale

Method used

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  • Graphene-based composite as well as preparation method and application thereof
  • Graphene-based composite as well as preparation method and application thereof
  • Graphene-based composite as well as preparation method and application thereof

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preparation example Construction

[0072] In the preparation method of the above-mentioned composite material provided by the present invention, first, the single-layer carbon nitrogen material, graphene, ammonia and hydrazine are mixed and reacted in water, and the process specifically includes:

[0073] First, the single-layer carbon-nitrogen material, graphene and part of water are mixed to obtain a mixed suspension; the concentration of the mixed suspension is preferably 0.05-5 mg / mL, more preferably 0.1-0.2 mg / mL. Then the mixed suspension is mixed with ammonia, wherein the ammonia is preferably ammonia water, the concentration of the ammonia water is preferably 25 to 26 wt%, and the volume ratio of the ammonia water to the mixed suspension is preferably (0.5 to 2) : (100-500), more preferably (0.7-1): (200-300); the mixing is preferably carried out under ultrasonic conditions, and the mixing time is preferably 1-2 hours. Afterwards, the mixture of the mixed suspension and ammonia is mixed with hydrazine f...

Embodiment 1

[0088] Preparation of monolayer C 3 N 4 :

[0089] (1) Use melamine as a precursor, put it into a crucible, cover it, put it in a muffle furnace and heat it up to 550°C, carbonize it for 4 hours, and then let it stand for cooling to get the bulk C 3 N 4 ;

[0090] (2) C prepared in the previous step 3 N 4 Grind it into powder, put it into a crucible, cover it, place it in a tube furnace, heat it at 530°C for 150min, let it cool down, and get C 3 N 4 Nanosheets;

[0091] (3) put C 3 N 4 The nanosheets were placed in isopropanol solution, ultrasonically centrifuged for 4 h, and dried in vacuum to obtain a single layer of C 3 N 4 .

Embodiment 2

[0093] Preparation of graphene (GR):

[0094] In SiO 2 A layer of nickel is deposited by electron beam evaporation on the / Si sheet, and then filled with Ar and H at about 900-1000°C 2 About 20min, then fill with CH at 1000°C for 5-10min 4 and H 2 , the CVD reaction can occur, and graphene is deposited on the nickel sheet.

[0095] The resulting graphene was wet-transferred onto a PET carrier to obtain a graphene / PET film.

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Abstract

The invention belongs to the field of photocatalytic materials and hydrogen storage materials, and particularly relates to a graphene-based composite as well as a preparation method and application thereof. The graphene-based composite material provided by the invention comprises a single-layer carbon-nitrogen material and graphene bonded to the two sides of the single-layer carbon-nitrogen material by a van der waals force. The composite material provided by the invention has good light absorption capacity in ultraviolet and visible light ranges of a solar energy, can efficiently collect thesolar energy, and thus is suitable for the field of photocatalysis. On the other hand, by utilizing the efficient selective permeability of graphene, the composite provided by the invention allows protons to penetrate through the graphene to participate in reaction, the newly produced hydrogen cannot escape, OH, O2 and the like are blocked from entering a system at the same time, adverse reactionis inhibited, and effective purification and safe storage of hydrogen can be realized, so that the composite is also suitable for the field of hydrogen storage.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials and hydrogen storage materials, and in particular relates to a graphene-based composite material and its preparation method and application. Background technique [0002] Fossil energy shortage and environmental pollution are two major problems facing human development today, and photocatalytic water splitting reaction can activate water molecule H through solar energy. 2 O, promotes the reaction, lowers the potential barrier, and produces hydrogen, a clean energy carrier. Since the combustion and utilization of hydrogen produces clean water, photolysis of water technology has shown great potential in terms of new energy and environmental governance, with significant advantages such as low cost, environmental friendliness and sustainable development. [0003] Using TiO from Fujishima, University of Tokyo, Japan 2 After the single crystal undergoes a photocatalytic reaction to split water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/02B82Y30/00B82Y40/00C01B3/04C01B3/00
CPCY02E60/32Y02E60/36Y02P20/133
Inventor 江俊杨丽罗毅
Owner 合肥机数量子科技有限公司
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