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Monoatomic catalyst and preparation method thereof, and application of monoatomic catalyst in photolysis of water to produce hydrogen

A technology for catalysts and water to produce hydrogen, applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology for materials and surface science, etc., can solve the problems of low utilization rate of precious metals, easy agglomeration and deactivation, single atom loading Low-level problems, to achieve the effect of improving low single-atom loading, high hydrogen production efficiency, and improving the effect of photocatalytic hydrogen production

Inactive Publication Date: 2018-10-23
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to improve the problem of low single-atom loading and easy agglomeration and deactivation of the above-mentioned single-atom catalyst, the present invention provides a single-atom catalyst with cadmium sulfide nanomaterials supporting noble metals, which not only improves the problem of low utilization of noble metals , and the highly dispersed noble metal single atoms on the surface of the catalyst can maintain a high degree of stability in the catalytic reaction, maximizing the catalytic efficiency

Method used

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  • Monoatomic catalyst and preparation method thereof, and application of monoatomic catalyst in photolysis of water to produce hydrogen
  • Monoatomic catalyst and preparation method thereof, and application of monoatomic catalyst in photolysis of water to produce hydrogen
  • Monoatomic catalyst and preparation method thereof, and application of monoatomic catalyst in photolysis of water to produce hydrogen

Examples

Experimental program
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Embodiment 1

[0050] Example 1 Preparation of cadmium sulfide nanowires

[0051] 40mg Cd(NO 3 ) 2 4H 2 Mix O and 28mg thiourea, add 10mL ethylenediamine, stir well, place in a 20mL polytetrafluoroethylene reactor, react at 120-200°C for 24 hours, cool to room temperature, filter, wash with water and ethanol, and dry , to obtain cadmium sulfide nanowire products.

Embodiment 2

[0052] The preparation example of embodiment 2 single atom catalyst Pt&CdS

[0053] Disperse 50 mg of cadmium sulfide nanowires in an aqueous solution of chloroplatinic acid, stir and react for 2-4 hours at 70-90 ° C to obtain a suspension, filter to obtain a solid precursor, wash with water and ethanol, and dry the obtained The precursor was heated to 130-150°C in an argon atmosphere, kept for two hours, and then cooled down to room temperature naturally to obtain platinum single-atom catalysts Pt&CdS supported by cadmium sulfide nanomaterials.

[0054] figure 1 It is the powder picture of cadmium sulfide nanowires before and after loading platinum single atoms, which proves that the loading process does not cause damage to the crystal structure of cadmium sulfide.

[0055] figure 2 The transmission electron microscope pictures taken under bright field for Pt&CdS, due to the low resolution of the transmission electron microscope, no platinum atoms can be observed, and it p...

Embodiment 3

[0057] Example 3 Test of the hydrogen production rate of the single-atom catalyst Pt&CdS as a photocatalyst for photolysis of water to produce hydrogen

[0058] Add 90 milliliters of deionized water, 10 milliliters of lactic acid, and 100 milligrams of sample to the reaction kettle, cover the reaction kettle, evacuate with a vacuum pump while stirring until no bubbles are produced in the liquid, and irradiate with a 300W xenon lamp (uvcut 420 filter) . Sampling once per hour, sampling six times, record the peak area, calculate the hydrogen production and hydrogen production rate. In the present invention, the hydrogen production rate of the photocatalyst Pt&CdS is 47.41mmol h -1 g -1 .

[0059] Figure 4 In order to compare the hydrogen production rate of nanowire cadmium sulfide and catalyst Pt&CdS in aqueous lactic acid solution, the hydrogen production rate of cadmium sulfide is 1.02mmol h -1 g -1 , the hydrogen production rate of catalyst Pt&CdS is 47.41mmol h -1 g ...

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Abstract

The invention specifically relates to a monoatomic catalyst and a preparation method thereof, and application of the monoatomic catalyst in photolysis of water to produce hydrogen, belonging to the technical field of nano-material preparation and hydrogen production catalysts. The catalyst is a composite material formed by loading the single atom of precious metal onto a cadmium sulfide nano-material. The preparation method comprises the following steps: (1) preparing a cadmium sulfide nano-material; (2) introducing the cadmium sulfide nano-material prepared in the step (1) into a solution ofa precious metal source to obtain a reaction solution containing a precursor; and (3) separating the precursor from the reaction solution obtained in the step (2), and calcining the precursor so as toobtain the composite material. The monoatomic catalyst of the invention can be used for photolysis of water to produce hydrogen, and the photocatalytic hydrogen production rate of the catalyst can beas high as 47.41 mmol / h / g, which is nearly 50 times the catalytic efficiency of catalysts only using cadmium sulfide; so the photocatalytic hydrogen production effect of cadmium sulfide-based catalysts are remarkably improved.

Description

Technical field [0001] The invention belongs to the technical fields of nanomaterial preparation and hydrogen production catalysts, and specifically relates to noble metal single atom catalysts, preparation methods thereof and applications in photolysis of water for hydrogen production. Background technique [0002] Due to serious global problems such as the greenhouse effect and environmental pollution, building a clean, environmentally friendly renewable new energy system has become a focus of global attention and a major strategy. Hydrogen energy has a high combustion value, and its combustion product is water, with no environmental pollution. Therefore, photocatalytic hydrogen production using abundant solar energy in nature, as one of the new energy sources for sustainable development, is increasingly attracting great attention from the international community. [0003] However, the above photocatalytic hydrogen production reaction usually needs to be carried out under ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/045B82Y30/00C01B3/04
CPCB82Y30/00C01B3/042B01J27/045C01B2203/107C01B2203/1082B01J35/39Y02E60/36
Inventor 毋欣张华彬康遥张健
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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