Molybdenum disulfide-cadmium sulfide nanometer composite material and preparing method and application thereof

A technology of nanocomposite materials and molybdenum disulfide, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of increased energy consumption and safety hazards, unfavorable catalytic reactions, and few active sites and other problems, to achieve the effect of low cost, reduced chance of recombination, and simple method

Active Publication Date: 2016-06-15
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to existing reports, MoS 2 The preparation process of /CdS composite materials is often accompanied by the process of solid-state high-temperature calcination, and some need to be heated in the highly toxic gas H 2 It is prepared under S atmosphere,...

Method used

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  • Molybdenum disulfide-cadmium sulfide nanometer composite material and preparing method and application thereof
  • Molybdenum disulfide-cadmium sulfide nanometer composite material and preparing method and application thereof
  • Molybdenum disulfide-cadmium sulfide nanometer composite material and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Dissolve 3.83g of cadmium nitrate and 3.70g of thiourea in 60ml of ethylenediamine, then transfer it to a 100ml polytetrafluoroethylene reactor, seal it and put it in an oven at 160°C for 24 hours. After cooling, it is centrifuged, washed, and vacuum-dried , to obtain cadmium sulfide nanorod powder. The cadmium sulfide nanorods have a length of 0.5-2 μm and a diameter of 20-30 nm.

[0040] Weigh 0.50 g of the above-prepared cadmium sulfide nanorod powder, ultrasonically disperse it in 30 ml of deionized water, add 0.08 g of sodium molybdate and 0.12 g of thiourea, and stir vigorously for 0.5 hours; then transfer the suspension into 50 mL of polytetrafluoroethylene In the reaction kettle, seal it and put it in an oven at 220°C for 24 hours to react, after cooling, centrifuge, wash, and vacuum dry to obtain MoS 2 / CdS nanocomposites.

[0041] figure 1 For the MoS prepared in Example 1 2 / CdS nanocomposites as well as pure CdS nanorods and MoS 2 The powder X-ray diffr...

Embodiment 2

[0050] The specific preparation method is basically the same as that in Example 1, except that cadmium chloride is used instead of cadmium nitrate to prepare CdS nanorods, and then MoS 2 / CdS nanocomposites. The MoS prepared in embodiment 2 2 The / CdS nanocomposite material was tested for its photocatalytic hydrogen production performance by the same method as in Example 1, and its photocatalytic water decomposition activity for hydrogen production was 49.18mmol / g / h.

Embodiment 3

[0052] The specific preparation method is basically the same as that in Example 1, except that: the solvothermal reaction is carried out at a temperature of 220° C. for 12 hours to prepare CdS nanorods. According to the same method as in Example 1, the MoS prepared in Example 3 was tested 2 / CdS nanocomposite photocatalytic water splitting hydrogen production performance, its photocatalytic water splitting hydrogen production activity is 49.24mmol / g / h.

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Abstract

The invention relates to a molybdenum disulfide-cadmium sulfide nanometer composite material and a preparing method thereof and an application of the molybdenum disulfide-cadmium sulfide nanometer composite material to water-photocatalytic-decomposition hydrogen production. The nanometer composite material comprises nanometer cadmium sulfide, and undefined-structure layered nanometer molybdenum disulfide growing on the nanometer cadmium sulfide in an in-situ mode. According to the nanometer composite material, the nanometer cadmium sulfide serves as a carrier; as the nanometer cadmium sulfide is of a nanometer structure, on one hand, the transmission path of electron holes can be shortened; on the other hand, as the specific surface area of the nanometer cadmium sulfide is large, the loading capacity of the molybdenum disulfide can be controlled. The molybdenum disulfide is in a layered shape and is of the undefined structure; when the molybdenum disulfide is used as a catalyst of water-photocatalytic-decomposition hydrogen production, a large number of active sites are provided for photoelectron and hydrogen ions in water reacting, and therefore the catalytic activity is improved. The molybdenum disulfide-cadmium sulfide nanometer composite material is used as the catalyst, and has the multiple advantages of being simple in method, low in cost, high in catalytic activity and the like.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a molybdenum disulfide-cadmium sulfide nanocomposite material, a preparation method thereof, and an application in photocatalytic decomposition of water to produce hydrogen. Background technique [0002] The population surge and industrial development have brought severe challenges to energy supply and environmental protection. The development of new energy sources with high calorific value and environmental friendliness has become a hot pursuit of science and technology. The calorific value of hydrogen is 142MJ / Kg, and the combustion product is water. It is an ideal energy source for energy supply and no pollutant emission. Judging from the existing technologies, the production of hydrogen mainly includes: ⅰ) photocatalytic decomposition of water to produce hydrogen; ii) electrocatalytic hydrogen production; ⅳ) catalytic reforming of methane and carbo...

Claims

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Application Information

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IPC IPC(8): B01J27/051C01B3/04
CPCB01J27/051B01J35/004B01J35/023C01B3/04Y02E60/36
Inventor 胡劲松万立骏尹兴良
Owner INST OF CHEM CHINESE ACAD OF SCI
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