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Heterostructure catalyst for decomposing water into hydrogen by using solar energy and preparation method of catalyst

A heterogeneous structure and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve problems such as poor carrier mobility

Active Publication Date: 2021-05-11
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] Technical problem: The purpose of this invention is to provide a heterogeneous structure catalyst and preparation method that uses solar energy to decompose water to produce hydrogen, and solve the problem of ZnIn 2 S 4 Applied in the photocatalytic water splitting, the problem of easy recombination of photogenerated electron-hole pairs and poor carrier mobility; used to optimize ZnIn 2 S 4 performance, and make it use solar photocatalytic water splitting to produce hydrogen

Method used

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  • Heterostructure catalyst for decomposing water into hydrogen by using solar energy and preparation method of catalyst
  • Heterostructure catalyst for decomposing water into hydrogen by using solar energy and preparation method of catalyst
  • Heterostructure catalyst for decomposing water into hydrogen by using solar energy and preparation method of catalyst

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preparation example Construction

[0043] The preparation method of the heterostructure catalytic material comprises the following steps:

[0044] Step 1. Preparation of SiO 2 , urea, nickel salt, deionized water mixed solution; the SiO 2 Disperse nanospheres into deionized water, then add urea and nickel salt and mix evenly to prepare mixed solution 1;

[0045] Step 2, transfer the mixed solution to a hydrothermal reaction kettle, and react at 105°C for 12h;

[0046] Step 3. After natural cooling, the product was washed with deionized water, centrifuged, and dried at 60°C to obtain SiO 2 @nickel silicate powder;

[0047] Step 4. Preparation of SiO 2 @nickel silicate, sodium sulfide, deionized water mixed solution; SiO 2 @nickelsilicate is dispersed in deionized water, adding sodium sulfide, and using NaOH solution to adjust the pH value of the solution to obtain mixed solution 2;

[0048] Step 5, transfer the mixed solution 2 to a hydrothermal reaction kettle, and react at 160°C for 12-20h;

[0049] Ste...

Embodiment 1

[0057] Example 1: 3.33 mmol SiO 2 , 16.65mmol urea and 0.557mmol Ni(NO 3 ) 2 .6H 2 O was dispersed in 40ml deionized water;

[0058] After mixing evenly, transfer to a hydrothermal reaction kettle and react at 105°C for 12 hours;

[0059] After natural cooling, the product was washed with deionized water-centrifuged 5 times, and dried at 60 °C to obtain SiO 2 @nickelsilicate powder;

[0060] 0.1g SiO 2 @nickel silicate dispersed in 40ml deionized water, add 1.29mmol Na 2 S·9H 2 O, fully mixed;

[0061] Use NaOH solution to adjust the pH of the solution to 13.4, then transfer to a hydrothermal reaction kettle, and react at 160°C for 18h;

[0062] After natural cooling, wash and centrifuge with deionized water for 4 times to collect the black precipitate, and vacuum dry at 60°C to obtain NiS hollow nanosphere powder;

[0063] Dissolve 0.474mmol NiS and 12mL glycerin in 40ml water and stir well;

[0064] Then add 1.6mmol ZnCl 2 , 1.6mmol InCl 3 4H 2 O and 3.2mmol TA...

Embodiment 2

[0074] Example 2: 13.3 mmol SiO 2 , 66.6mmol urea and 2mmol Ni(NO 3 ) 2 .6H 2 O was dispersed in 160ml deionized water;

[0075] After mixing evenly, transfer to a hydrothermal reaction kettle and react at 105°C for 12 hours;

[0076] After natural cooling, the product was washed with deionized water-centrifuged 5 times, and dried at 60 °C to obtain SiO 2 @nickelsilicate powder;

[0077] 0.2g SiO 2 @nickel silicate dispersed in 80ml deionized water, add 2.581mmol Na 2 S·9H 2 O, fully mixed;

[0078] Use NaOH solution to adjust the pH of the solution to 13.4, then transfer to a hydrothermal reaction kettle, and react at 160°C for 16h;

[0079] After natural cooling, wash and centrifuge with deionized water for 4 times to collect the black precipitate, and vacuum dry at 60°C to obtain NiS hollow nanosphere powder;

[0080] Dissolve 0.095mmol NiS and 2mL glycerin in water and stir well;

[0081] Then add 0.399mmol ZnCl 2 , 0.411mmol InCl 3 4H 2 O and 0.799mmol TAA; ...

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Abstract

The invention discloses a heterostructure catalyst for decomposing water into hydrogen by utilizing solar energy and a preparation method of the catalyst, and belongs to a preparation method of a semiconductor photocatalytic material. The preparation method comprises the following steps: 1) dispersing SiO2 nanospheres into deionized water, adding urea and nickel nitrate, and uniformly conducting mixing; 2) transferring the mixed solution into a hydrothermal reaction kettle, and conducting reacting at 105 DEG C for 12 hours; (3) after natural cooling, centrifuging a product, and drying the product to obtain SiO2-coated nickel silicate powder; (4) dispersing the SiO2-coated nickel silicate into deionized water, adding sodium sulfide, and adjusting the pH of a mixed solution by using NaOH; 5) transferring the mixed solution into a hydrothermal reaction kettle, and conducting reacting at 160 DEG C for 12-20 hours; 6) after natural cooling, centrifugally collecting black precipitates, and performing vacuum drying to obtain NiS hollow nanosphere powder; 7) dissolving NiS and glycerin in water, and adding zinc chloride, indium chloride and thioacetamide; 8) reacting the solution for 2 hours at 80 DEG C in a stirring state; and 9) carrying out centrifugation, washing and drying to obtain NiS-coated ZnIn2S4. The NiS-coated ZnIn2S4 spherical heterostructure has the advantages of large specific surface area, low density, good surface permeability and visible light response.

Description

technical field [0001] The invention relates to a preparation method of a semiconductor photocatalytic material, in particular to a heterogeneous structure catalyst and a preparation method for utilizing solar energy to decompose water to produce hydrogen. Background technique [0002] With the continuous development of the global economy, human demand for energy continues to grow, and the large-scale exploitation and use of traditional fossil fuels has brought about problems such as greenhouse effect and environmental pollution. As a high-energy-density energy source, hydrogen energy has many advantages such as cleanness, high efficiency, safety, storability, and transportability. It is expected to replace traditional fossil fuels as a new energy carrier. At present, the traditional hydrogen production methods mainly include: hydrogen production from coal, hydrogen production from natural gas, hydrogen production from methanol, and hydrogen production from electrolyzed wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J35/08C01B3/04
CPCB01J27/043C01B3/042C01B2203/0277C01B2203/1058C01B2203/1076B01J35/39B01J35/51Y02P20/133Y02E60/36
Inventor 顾修全吴凯李亚光
Owner CHINA UNIV OF MINING & TECH
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