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Photocatalytic material, preparation method thereof and application of photocatalytic material to visible light water splitting hydrogen production

A technology of photocatalytic materials and composite materials, which is applied in the application field of visible light decomposition of water to produce hydrogen, can solve the problems of photocorrosion and high recombination rate of photogenerated charge carriers, reduce energy consumption and cost, and the preparation method is simple and controllable. The effect of increasing the number

Inactive Publication Date: 2019-05-10
QINGDAO UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, the inventors found that pure CdS has problems such as high recombination rate of photogenerated charge carriers and photocorrosion, which limits its practical application.

Method used

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  • Photocatalytic material, preparation method thereof and application of photocatalytic material to visible light water splitting hydrogen production
  • Photocatalytic material, preparation method thereof and application of photocatalytic material to visible light water splitting hydrogen production
  • Photocatalytic material, preparation method thereof and application of photocatalytic material to visible light water splitting hydrogen production

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preparation example Construction

[0047] The present invention also provides the above-mentioned composite material (Cd 1-x Zn x S / WO 3-y / CoO / NiO) preparation method, it comprises the steps:

[0048] 1) Preparation of Cd 1-x Zn x S solid solution nanocrystal, where 0≤x≤1;

[0049] 2) The Cd of step 1) 1-x Zn x S solid solution nanocrystal, WCl 4 Disperse in ethylene glycol solvent, carry out ion adsorption and hydrolysis oxidation reaction, and prepare Cd 1-x Zn x S / WO 3-y composite materials;

[0050] 3) the Cd of step 2) 1-x Zn x S / WO 3-y The composite material is dispersed in an aqueous solution of nickel acetate and cobalt acetate containing a sacrificial agent, and deposited in situ under light irradiation to prepare the composite material Cd 1-x Zn x S / WO 3-y / CoO / NiO, 0≤y≤0.3.

[0051] According to one embodiment of the present invention, in step 1), the Cd 1-x Zn x The preparation method of S solid solution nanocrystals is not particularly limited, and it can be prepared by conventi...

preparation example 1

[0084] (1) Synthesis of Cd 0.85 Zn 0.15 S nanorods.

[0085] Pour 35 ml of ethylenediamine into the cleaned and dried polytetrafluoroethylene liner (50 ml), then add 1.7 mmol of cadmium nitrate, 0.3 mmol of zinc nitrate, and 4.0 mmol of sublimated sulfur successively, stir and Sonicate for 5 minutes to dissolve, then stir the suspension for 30 minutes to mix well. Then, the reaction kettle was screwed tightly and sealed, and then put into an electric heating constant temperature blast drying oven, and reacted for 12 hours at 200 degrees Celsius. After the reaction was finished, it was naturally cooled to room temperature, and the product was taken out, centrifuged, and washed three times alternately with ethanol and deionized water. Finally, put the sample product into a vacuum drying oven and dry it at 80 degrees Celsius for 5 hours to obtain Cd 0.85 Zn 0.15 S nanorods.

[0086] figure 1 for the obtained Cd 0.85 Zn 0.15 SEM images of 1D nanocrystals. from figure 1 ...

preparation example 2

[0091] Step (1) is the same as the step (1) of Preparation Example 1;

[0092] (2) Synthesis of Cd 0.85 Zn 0.15 S / 0.08WO 3-y Composite nanorods; where, WCl 4 The concentration is 0.08M, so it is recorded as Cd 0.85 Zn 0.15 S / 0.08WO 3-y .

[0093] 0.6g of Cd from step 1) 1-x Zn x S solid solution nanocrystals were ultrasonically dispersed in ethylene glycol, and then WCl dissolved in ethylene glycol by ultrasonic was added 4 solution, after stirring the mixture evenly, continue to stir at room temperature for 0.5-1 hour, after the solid product in the solution is centrifuged, wash it once with ethanol and then wash it twice with deionized water, and dry it in vacuum at 80 degrees Celsius for 5 hours , synthesized to obtain Cd 1-x Zn x S / 0.08WO 3-y composite material.

[0094] Figure 4 is Cd 0.85 Zn 0.15 S / 0.08WO 3-y TEM and high-resolution TEM images of composite nanorods. From the transmission diagram, it can be found that the product retains the morphology ...

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Abstract

The invention relates to a photocatalytic material, a preparation method thereof and an application of the photocatalytic material to visible light water splitting hydrogen production. The composite material prepared by the method has ultra-thin WO3-y amorphous coating layer to increase the number of active sites, so that improvement of photocatalytic activity is facilitated. Illumination reactionis implemented by Cd1-xZnxS / WO3-y, so that in-situ loading of CoO / NiO is achieved, and a heat treatment process needed by conventional load of the CoO / NiO is omitted, so that damage to the structureof a sulfide catalyst is avoided. The preparation method is simple and controllable, the composite material prepared by the method can realize efficient photocatalytic water splitting hydrogen production without loading precious metal under visible light, energy consumption and cost are greatly reduced, and the catalytic hydrogen production rate of the prepared composite material reaches up to 28mmol*h<-1>*g<-1>.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, in particular to a Cd 1-x Zn x S / WO 3-y / CoO / NiO photocatalytic material and its preparation method and its application in visible light splitting water for hydrogen production. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the rapid development of modern industry, human demand for energy is increasing day by day. At present, fossil energy, such as coal, oil, and natural gas, is still the main body of daily energy consumption. However, due to the non-renewability of these traditional energy sources and various harmful gases and solid wastes produced during the combustion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/049B01J37/34B01J37/08C01B3/04
Inventor 林海峰王磊黎艳艳阮芹芹孙博文
Owner QINGDAO UNIV OF SCI & TECH
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