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A gold@zinc oxide core-shell heterojunction thin film and its preparation method and application

A heterojunction, core-shell technology, applied in the direction of metal processing equipment, electrodes, coatings, etc., can solve the problems of reduced catalytic reaction efficiency, achieve good photoelectric stability, excellent photoelectrochemical hydrogen production capacity, solve the problem of ultraviolet light and The effect of catalytic reaction efficiency reduction

Active Publication Date: 2018-07-13
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems in the above-mentioned prior art, the present invention provides a gold@zinc oxide core-shell heterojunction film and its preparation method and application, which not only have a high utilization rate of sunlight and excellent catalytic reaction efficiency, It can effectively solve the technical problems in the prior art that a single zinc oxide nanoparticle can only absorb ultraviolet light and photogenerated electrons-holes are easy to recombine, resulting in a reduction in catalytic reaction efficiency, and has good photoelectric stability, and there will be no gold in practical applications. Separation from Zinc Oxide

Method used

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  • A gold@zinc oxide core-shell heterojunction thin film and its preparation method and application
  • A gold@zinc oxide core-shell heterojunction thin film and its preparation method and application
  • A gold@zinc oxide core-shell heterojunction thin film and its preparation method and application

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preparation example Construction

[0033] A gold@zinc oxide core-shell heterojunction thin film, the preparation method of which comprises the following steps:

[0034] Step A, disperse the gold@zinc oxide core-shell heterogeneous composite nanoparticles into the ethanol solution, and add dodecanethiol under stirring state (for example: under magnetic stirring state), so that dodecanethiol in the mixed liquid The concentration is 5-30 mmol / L, and then stand in the air for 10-30 minutes (preferably 15 minutes), so as to prepare the ethanol dispersion of surface-hydrophobic gold@zinc oxide core-shell heterogeneous composite nanoparticles.

[0035]Specifically, the treatment of dodecanethiol can make the gold@zinc oxide core-shell heterogeneous composite nanoparticles have good surface hydrophobic properties, which is conducive to the preparation of gold@zinc oxide core-shell heterogeneous composite nanoparticles through the gas-liquid interface self-assembly method. Thin film. The gold@zinc oxide core-shell hete...

Embodiment 1

[0051] A gold@zinc oxide core-shell heterojunction thin film, the preparation method of which comprises the following steps:

[0052] Step a1, adding a diethylene glycol diacrylate aqueous solution (the relative molecular weight of the diethylene glycol diacrylate is 100,000 to 200,000) with a mass concentration of 20% purchased on the market into the ethyl alcohol diol solution, and stir evenly, so as to obtain the ethylene glycol solution of diethylene glycol diacrylate phthalate; then add gold chloride to the ethylene glycol solution of diethylene glycol diacrylate phthalate Acid aqueous solution, so that the concentration of diethylene glycol diacrylate in the mixed liquid is 0.025 mole / liter, and the concentration of chloroauric acid is 0.0005 mole / liter, thereby obtaining the reaction precursor of gold octahedral nanoparticles.

[0053] Step b1, reacting the reaction precursor of the gold octahedral nanoparticles at 220° C. for 30 minutes to prepare a colloidal solution ...

Embodiment 2

[0060] A gold@zinc oxide core-shell heterojunction thin film, the preparation method of which comprises the following steps:

[0061] Step a2, adding a diethylene glycol diacrylate aqueous solution (the relative molecular weight of the diethylene glycol diacrylate is 100000 to 200000) purchased on the market with a mass concentration of 20% into the ethyl alcohol diol solution, and stir evenly, so as to obtain the ethylene glycol solution of diethylene glycol diacrylate phthalate; then add gold chloride to the ethylene glycol solution of diethylene glycol diacrylate phthalate Acid aqueous solution, so that the concentration of diethylene glycol diacrylate in the mixed liquid is 0.025 mole / liter, and the concentration of chloroauric acid is 0.0005 mole / liter, thereby obtaining the reaction precursor of gold octahedral nanoparticles.

[0062] Step b2, reacting the reaction precursor of the gold octahedral nanoparticles at 220° C. for 30 minutes to prepare a colloidal solution of...

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Abstract

The invention discloses a gold@zinc oxide core-shell heterojunction film and its preparation method and application. The gold@zinc oxide core-shell heterojunction film first adopts dodecyl mercaptan to gold@zinc oxide core-shell heterojunction composite The nanoparticles were subjected to surface hydrophobic treatment, and then the surface-hydrophobized gold@zinc oxide core-shell heterogeneous composite nanoparticles were dispersed in n-butanol, and a single-layer nanoparticle array was prepared by the gas-liquid interface self-assembly method, and then used The substrate can pick up the single-layer nanoparticle array to prepare an ordered single-layer gold@zinc oxide core-shell heterojunction film. The gold@zinc oxide core-shell heterojunction film can be used as a working electrode for photoelectrochemical water splitting. It has excellent photoelectrochemical hydrogen production ability and good photoelectric stability. Ultraviolet light and the technical problems of reduced catalytic reaction efficiency, and the separation of gold and zinc oxide will not occur in practical applications.

Description

technical field [0001] The invention relates to the field of core-shell structure nanocomposites, in particular to a core-shell heterojunction thin film of gold@zinc oxide (that is, a core-shell structure with gold nanoparticles as the core body and zinc oxide as the shell) and its preparation method and application. Background technique [0002] With the depletion of fossil energy and people's increasing emphasis on environmental protection, it is extremely urgent to find clean and renewable alternative energy. Solar energy is a sustainable and clean energy, so it has broad application prospects in the fields of photothermal conversion and photovoltaic power generation. In recent years, semiconductor materials have been increasingly used to produce hydrogen from solar energy as a renewable energy source. Therefore, selecting suitable photoelectrode materials to improve photoelectrochemical performance has become an important topic of current research. [0003] Zinc oxide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06B22F9/24B22F1/02B82Y40/00B05D1/00
CPCC25B1/04B82Y40/00B05D1/00B22F9/24C25B1/55C25B11/093B22F1/16Y02E60/36
Inventor 李越孙一强杭立峰刘广强蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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