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A 1t/2h mixed-phase molybdenum disulfide material and its preparation method and application

A molybdenum disulfide and mixed-phase technology, applied in chemical instruments and methods, water/sewage treatment, general water supply conservation, etc., can solve the problems of inability to achieve full-spectrum solar energy absorption, complex preparation process, large energy band gap, etc. High-efficiency solar vapor concentration, high photothermal conversion efficiency, and enhanced solar absorption

Active Publication Date: 2022-04-01
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon-based nanomaterials have become the subject of extensive research due to their low cost, but they also have disadvantages such as difficult dispersion and complicated preparation processes.
As a graphene-like material, molybdenum disulfide exhibits excellent light absorption properties. However, the stable 2H phase molybdenum disulfide exhibits semiconductor performance and has a large energy band gap, which cannot achieve efficient full-spectrum solar energy absorption. There is a problem of low solar energy absorption efficiency; there are also studies on the synthesis of 1T / 2H mixed-phase molybdenum disulfide by doping layers with lithium and sodium ions, but the molybdenum disulfide samples obtained by doping layers with lithium and sodium ions cannot maintain stable existence
The incompatibility between band gap reduction and existence stability seriously hinders the wide application of molybdenum disulfide thin films in localized solar steam technology

Method used

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  • A 1t/2h mixed-phase molybdenum disulfide material and its preparation method and application
  • A 1t/2h mixed-phase molybdenum disulfide material and its preparation method and application
  • A 1t/2h mixed-phase molybdenum disulfide material and its preparation method and application

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preparation example Construction

[0038] The present invention also provides a preparation method of the IT / 2H mixed phase molybdenum disulfide material described in the above technical solution, comprising the following steps:

[0039] The molybdenum source, sulfur source and water are mixed, followed by hydrothermal reaction and first drying treatment to obtain 1T / 2H mixed phase molybdenum disulfide powder;

[0040] On the substrate, using the 1T / 2H mixed phase molybdenum disulfide powder to prepare a 1T / 2H mixed phase molybdenum disulfide thin film;

[0041] The 1T / 2H mixed-phase molybdenum disulfide film is subjected to a second drying treatment to obtain a 1T / 2H mixed-phase molybdenum disulfide material.

[0042] In the present invention, unless otherwise specified, all the preparation materials of the present invention are commercially available products well known to those skilled in the art.

[0043] In the invention, the molybdenum source, the sulfur source and water are mixed, and the hydrothermal r...

Embodiment 1

[0057] Mix 0.7g of ammonium molybdate, 0.6g of thioacetamide and 40mL of pure water under the condition of 500rpm magnetic stirring for 30 minutes to obtain a mixed solution; Thermal reaction for 20 hours, after the reaction was completed, naturally cool to room temperature, under the condition of 10000rpm centrifugal speed, alternately wash with water and ethanol for 4 times, and freeze-dry for 24 hours to obtain 1T / 2H mixed-phase molybdenum disulfide powder;

[0058] Ultrasonic disperse 10 mg of the obtained 1T / 2H mixed-phase molybdenum disulfide powder in 10 mL of water under the condition of an ultrasonic frequency of 40 kHz to obtain a dispersion liquid, and use a mixed cellulose filter membrane with a pore size of 0.22 μm as a substrate, and filter it under reduced pressure. Suction filter the dispersion on the substrate to obtain the IT / 2H mixed-phase molybdenum disulfide film, keep the substrate, and dry the sample including the substrate and the IT / 2H mixed-phase molyb...

Embodiment 2

[0076] The high-temperature hydrothermal reaction temperature is 160° C., and the rest of the preparation process is the same as in Example 1 to obtain a 1T / 2H mixed-phase molybdenum disulfide material.

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Abstract

The invention belongs to the technical field of functional nanometer materials, and in particular relates to a 1T / 2H mixed-phase molybdenum disulfide material and its preparation method and application. The invention provides a 1T / 2H mixed-phase molybdenum disulfide material, which includes a substrate and a 1T / 2H mixed-phase molybdenum disulfide layer on the surface of the substrate. The 1T / 2H mixed-phase molybdenum disulfide material provided by the invention has a higher phase transition temperature and a lower energy band gap, and has stable and efficient full-spectrum solar energy absorption. The experimental results show that the 1T / 2H mixed-phase molybdenum disulfide material of the present invention forms local heat at the water-vapor interface, realizing a highly efficient solar steam evaporation rate of 1.52kg m ‑2 h ‑1 , compared with the 2H phase molybdenum disulfide material, the evaporation efficiency increased by 20%.

Description

technical field [0001] The invention belongs to the technical field of functional nanometer materials, and in particular relates to a 1T / 2H mixed-phase molybdenum disulfide material and its preparation method and application. Background technique [0002] With the increasing utilization and unreasonable waste, the shortage of fresh water resources is becoming more and more obvious. Because solar energy is rich, clean, and non-polluting, solar steam technology has become an effective method to solve this problem. Among them, localized solar steam technology uses local heating of photothermal materials to evaporate water at the gas-liquid interface, reducing the Due to the heat loss associated with heating the entire water body, high-efficiency steam reforming is achieved, which has the advantage of low energy consumption and has attracted widespread attention. [0003] Efficient photothermal materials are the basis for localized solar steam. Materials widely used in localiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C02F1/14C02F103/08
CPCC08J7/06C02F1/14C02F2103/08Y02A20/142Y02A20/212Y02A20/124
Inventor 王贤保郭珍珍梅涛钱静雯李金华王建颖余黎
Owner HUBEI UNIV
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