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Composite photocatalyst for promoting water photolysis for producing hydrogen

A technology of composite light and catalyst, applied in physical/chemical process catalyst, hydrogen production, hydrogen and other directions, can solve the problems of poor stability, low quantum efficiency, low activity, etc. Effect

Inactive Publication Date: 2016-11-09
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a composite photocatalyst that promotes photolysis of water to produce hydrogen. It aims at the deficiencies of existing materials and synthesizes a composite photocatalyst with better stability and activity. The composite photocatalyst can effectively promote The separation of photogenerated carriers improves the photoreaction efficiency and prevents the oxidation of the catalyst itself, which solves the shortcomings of traditional photocatalysts such as poor stability, low activity, and low quantum efficiency; and the synthesis method of the composite photocatalyst is simple and easy, and the output is considerable , and the conditions of the photocatalytic reaction it participates in are mild, which is conducive to the popularization and application in the hydrogen production reaction of photolysis of water

Method used

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  • Composite photocatalyst for promoting water photolysis for producing hydrogen
  • Composite photocatalyst for promoting water photolysis for producing hydrogen
  • Composite photocatalyst for promoting water photolysis for producing hydrogen

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1 NiTiO 3 preparation of

[0025] 2.48g of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H 2 O) Dissolved in 60mL ethylene glycol solution, after fully dissolved, 3.4mL tetrabutyl titanate (Ti(OC 4 h 9 ) 4 ) was added dropwise to the above solution, stirred at room temperature for 1 h, the resulting green precipitate was washed with ethanol, dried, and calcined at 600 °C for 2 h in an air atmosphere to obtain NiTiO 3 .

Embodiment 2

[0026] Example 2 CdS / NiTiO 3 Preparation of composite catalyst

[0027] The NiTiO that 0.5g embodiment 1 obtains 3 Disperse in 70mL DMF solution, then add 8.7mL 0.2M DMF solution containing cadmium acetate and 8.7mL 1M DMF solution containing thiourea to the above solution, stir at room temperature for 30min, then condense the solution at 160°C to reflux 12h, the resulting product was washed three times with ethanol and deionized water, and dried to obtain the desired CdS / NiTiO 3 composite photocatalyst.

Embodiment 3

[0028] Example 3 CdS / NiTiO 3 Activity Evaluation of Photolysis of Water for Hydrogen Production

[0029] Embodiment 2 gained CdS / NiTiO 3 The evaluation experiment of hydrogen production efficiency of composite photocatalyst by photolysis of water was carried out on the Pofilai photolysis device, and Shimadzu 8A gas chromatography was used to detect H 2 output. The experimental process is as follows: add 50 mg of the obtained composite photocatalyst to 70 mL of deionized water, and add 10 mL of lactic acid as a hole sacrificial agent, use a xenon lamp as the light source, and add a 420 nm cut-off filter to conduct photolysis of water on a photolysis water device. Reaction, the system is vacuumed, the reaction temperature is 5°C, and then the system is illuminated with visible light of λ>420nm, and the H in the system is detected every 1h. 2 content, the reaction was terminated after 5h.

[0030] figure 1 CdS, NiTiO 3 , CdS / NiTiO 3 The XRD comparison pattern. Such as fi...

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Abstract

The invention discloses a composite photocatalyst for promoting water photolysis for producing hydrogen. The CdS / NiTiO3 composite photocatalyst is prepared through condensation-reflux introduction of a perovskite material NiTiO3 to CdS, wherein the NiTiO3 is synthesized through a sol-gel technology and is used as a cocatalyst. The composite catalyst promotes transfer of photon-generated carriers through a heterostructure formed by CdS and NiTiO3 and reduces the compounding probability of photon-generated electrons and holes, so the efficiency of water photolysis for producing hydrogen is substantially improved, and the disadvantage of photocorrosion of traditional photocatalysts is alleviated. The composite photocatalyst has the advantages of simple and easy preparation method, mild reaction conditions, and wide application prospect in the fields of development of energy alternatives of fossil fuels and high-efficiency utilization of the solar energy.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by photolysis of water, and in particular relates to a composite photocatalyst for promoting hydrogen production by photolysis of water. Background technique [0002] Facing the dual challenges of energy crisis and environmental pollution that the world is facing today, people have found that photocatalytic technology has the advantages of low cost, mild reaction conditions, environmental friendliness and low energy consumption in the process of actively exploring and developing clean new energy. Hydrogen production from water splitting has been extensively studied. Using photolysis water hydrogen production technology to make H 2 O to H 2 , can alleviate the energy crisis to a certain extent. At the same time, H 2 As a new type of clean energy, its use will not cause new pollution problems. Compared with the traditional hydrogen production reaction by electrolysis of water, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C01B3/04
CPCC01B3/042B01J27/043C01B2203/1094C01B2203/1058B01J35/39Y02E60/36Y02P20/133
Inventor 丁正新王兆宇李朝晖员汝胜戴文新
Owner FUZHOU UNIV
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