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A nickel sulfide-cadmium sulfide nanowire heterostructure and its preparation method

A heterostructure, cadmium sulfide technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of poor electrical conductivity, limited degree of visible light catalysis, and poor light absorption, and achieve electrical conductivity. The effect of good performance, strictly controllable synthetic growth conditions, and low cost

Active Publication Date: 2019-11-12
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] On the other hand, in the nickel sulfide and cadmium sulfide composite materials currently synthesized by solvothermal method, nickel sulfide is mostly polysulfide or α-NiS, which has poor conductivity and poor light absorption ability, which is very important for improving the cadmium sulfide composite material. The degree of visible light catalytic ability is limited

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  • A nickel sulfide-cadmium sulfide nanowire heterostructure and its preparation method
  • A nickel sulfide-cadmium sulfide nanowire heterostructure and its preparation method
  • A nickel sulfide-cadmium sulfide nanowire heterostructure and its preparation method

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[0032] The preparation method of nickel sulfide-cadmium sulfide nanowire heterostructure proposed by the present invention comprises the following steps and contents:

[0033] (1) In the autoclave, first add ethylenediamine, then add sulfur powder and cadmium acetate at a molar ratio (2-3): 1, stir well to make it evenly mixed. After sealing the reactor, heat it to 180-240°C at a speed of 5-20°C / min and react for 18-24 hours. After naturally cooling to room temperature, the reaction kettle was opened, and the generated precipitate was alternately centrifuged and washed with deionized water and alcohol for 3-5 times to obtain pure cadmium sulfide nanowires. Then, cadmium sulfide nanowires were dispersed in deionized water and set aside.

[0034] (2) In the beaker, first add deionized water, then add nickel acetate, then add the aqueous dispersion of cadmium sulfide nanowires, and keep stirring for 3-5 hours. Then, add thiourea and sodium hypophosphite in sequence. After stir...

Embodiment 1

[0040] Example 1: In a 50mL autoclave, add 40mL of ethylenediamine, then sequentially add 0.2665g of cadmium acetate and 0.0641g of sulfur powder, stir well to make it evenly mixed. After sealing the reaction vessel, it was heated to 200° C. at a speed of 15° C. / min and reacted for 20 hours. After naturally cooling to room temperature, the reaction kettle was opened, and the precipitate formed was washed with deionized water and alcohol alternately and centrifuged three times, and then the product was dispersed in 40 mL of deionized water for later use.

[0041] In a 100mL beaker, add 40mL of deionized water, then dissolve 40mg of nickel acetate into it, then add 10mL of the above-mentioned aqueous dispersion of cadmium sulfide nanowires (containing about 29 mg of cadmium sulfide), and continue stirring at room temperature for 3 hours. Add 50mg of thiourea and 60mg of sodium hypophosphite to the mixture, and continue to stir until it is evenly mixed. Finally, the mixture was ...

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Abstract

The invention relates to a nickel sulfide-cadmium sulfide nanowire heterostructure and a preparation method thereof and belongs to the technical field of preparation of new energy materials. According to the composite material provided by the invention, the main body is the cadmium sulfide nanowire, and dentritic beta-NiS sheets are attached to the surface. The material has excellent capacity of performing visible catalytic decomposition on water to produce hydrogen. The preparation method comprises the following steps: preparing the cadmium sulfide nanowire by a solvent thermal process; taking the obtained cadmium sulfide nanowire as a template, taking nickel acetate as a nickel source, taking thiourea as a sulfur source, taking sodium hypophosphite as a reducing agent, uniformly growing beta-NiS nanosheets on the surface of cadmium sulfide in a hydrothermal environment, thereby obtaining the nickel sulfide-cadmium sulfide nanowire heterostructure with tight combination and dispersing uniformity. The product obtained by the method is high in yield, high in purity and controllable in morphology and does not need after-treatment; and moreover, the method has the advantages of simplicity in equipment and process, strict and controllable synthetic growth conditions, high product yield, low cost, clean and environmental-friendly production process and the like.

Description

technical field [0001] The invention relates to a nickel sulfide-cadmium sulfide nanowire heterostructure and a preparation method thereof, belonging to the technical field of new energy material preparation. Background technique [0002] Cadmium sulfide (CdS), as a typical II-IV transition metal chalcogenide semiconductor, has a direct band gap with a width of about 2.5 eV, which matches the spectral range of visible light. And it has relatively small work function, large refractive index and good physical and chemical stability. Detection) and optics (such as nonlinear components, optical waveguide components, lasers) and other fields have broad application prospects. [0003] Although the band gap of cadmium sulfide matches with visible light and has strong visible light absorption ability, it should have excellent photocatalytic performance in theory, but because the electrons and holes generated in the photocatalytic process are very easy to recombine, and Corrosion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043C01B3/04
CPCB01J27/043B01J35/004C01B3/042C01B2203/0277C01B2203/1058Y02E60/36
Inventor 符秀丽官顺东张宇彭志坚
Owner BEIJING UNIV OF POSTS & TELECOMM
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