CN-121972197-A - TiN/N-TiO for producing hydrogen by decomposing water2Photocatalytic composite material, preparation method and application thereof

Abstract

The invention provides a TiN/N-TiO 2 photocatalytic composite material for hydrogen production by decomposing water, a preparation method and application thereof, and belongs to the technical field of hydrogen production. The preparation method comprises calcining rutile phase N-TiO 2 powder in the mixed atmosphere of hydrogen and inert gas to obtain TiN/N-TiO 2 photocatalytic composite material. The invention successfully prepares the TiN/N-TiO 2 heterojunction photocatalyst with the lattice matching heterogeneous interface. The formation of lattice-matched heterointerfaces can improve the separation and transfer efficiency of photogenerated carriers in TiN/N-TiO 2 . Meanwhile, tiN/N-TiO 2 is at 300 The light absorption capacity in the 2000nm range is significantly enhanced. Finally, tiN/N-TiO 2 has excellent photocatalytic water splitting hydrogen production activity.

Inventors

• LI XUANHUA
• ZHANG SHUJIE
• ZHANG YOUZI
• Liu Sibi

Assignees

• 西北工业大学深圳研究院
• 西北工业大学

Dates

Publication Date

20260505

Application Date

20260114

Claims (10)

1. 1. A preparation method of a TiN/N-TiO 2 photocatalysis composite material for hydrogen production by decomposing water is characterized by comprising the step of calcining rutile phase N-TiO 2 powder in a mixed atmosphere of hydrogen and inert gas to obtain the TiN/N-TiO 2 photocatalysis composite material.
2. 2. The method for preparing the TiN/N-TiO 2 photocatalytic composite material for hydrogen production by water decomposition according to claim 1, wherein the calcination temperature is 700-800 ℃, the calcination time is 3-6 hours, and the temperature rising rate during calcination is 2-5 ℃ per min.
3. 3. The method for preparing the TiN/N-TiO 2 photocatalytic composite material for hydrogen production by water decomposition according to claim 1, wherein the volume ratio of hydrogen to inert gas in the mixed atmosphere is 1 (15-20), and the flow rate of the mixed atmosphere is 35-45 mL/min.
4. 4. The method for preparing the TiN/N-TiO 2 photocatalytic composite material for hydrogen production by water splitting according to claim 1, wherein the inert gas is selected from argon and helium.
5. 5. The method for preparing the TiN/N-TiO 2 photocatalytic composite material for hydrogen production by decomposing water according to claim 1, wherein the preparation process of the rutile phase N-TiO 2 powder comprises the following steps: Uniformly mixing a soluble titanium source organic solvent, a soluble oxygen source organic solvent and water to obtain a mixed solution, slowly dripping the soluble nitrogen source solution into the mixed solution to form white precipitate, centrifugally drying, calcining the white precipitate in air to obtain anatase phase N-TiO 2 powder, and calcining the anatase phase N-TiO 2 powder in an inert atmosphere to obtain rutile phase N-TiO 2 powder.
6. 6. The method for preparing the TiN/N-TiO 2 photocatalytic composite material for hydrogen production by water decomposition according to claim 5, wherein the soluble titanium source organic solvent is tetrabutyl titanate, the soluble oxygen source organic solvent is glacial acetic acid, the soluble nitrogen source solution is ammonia water, and the mass ratio of the tetrabutyl titanate, the glacial acetic acid and the ammonia water is 5:10 (1-2).
7. 7. The method for preparing the TiN/N-TiO 2 photocatalytic composite material for hydrogen production by water decomposition according to claim 5, wherein the calcination temperature in air is 300 to 500 ℃ and the time is 1 to 3 hours.
8. 8. The method for preparing a TiN/N-TiO 2 photocatalytic composite material for hydrogen production by water decomposition according to claim 5, wherein the calcination temperature is 700 to 800 ℃ for 1 to 3 hours in an inert atmosphere.
9. 9. A TiN/N-TiO 2 photocatalytic composite material produced by the production method according to any one of claims 1 to 8.
10. 10. Use of the TiN/N-TiO 2 photocatalytic composite according to claim 9 as a photocatalyst for the production of hydrogen by decomposition of water.

Description

TiN/N-TiO 2 photocatalytic composite material for hydrogen production by water decomposition, preparation method and application thereof Technical Field The invention belongs to the technical field of hydrogen production, and relates to a photocatalytic material, in particular to a TiN/N-TiO 2 photocatalytic composite material for hydrogen production by decomposing water, a preparation method and application thereof. Background With the rapid development of global industrialization and urbanization, excessive dependence on fossil fuels has raised serious energy crisis and environmental problems, such as greenhouse effect and climate change. Therefore, finding a clean, renewable, efficient alternative energy source has become a global focus of attention. Among the many candidate energy sources, hydrogen is considered as one of the ideal green energy sources with the most development potential because of its high combustion heat value and the fact that the combustion product is only water, so that the actual zero carbon emission can be realized. Among the preparation technologies of green hydrogen, the photocatalytic water splitting hydrogen production technology can directly utilize inexhaustible solar energy to split water into hydrogen and oxygen, and the technical route has the remarkable advantages of mild reaction conditions, simple process, no pollution and the like, and is considered as an ideal way with great attraction. However, the practical application of the present photocatalytic water splitting technology still faces a great challenge, and the core bottleneck of the present photocatalytic material is the photocatalytic material itself. The development of a novel high-efficiency photocatalyst with wide spectral response, high carrier separation efficiency, excellent stability and rich active sites has important significance for promoting the practical application of the solar photocatalytic hydrogen production technology and fundamentally solving the energy and environmental problems. Titanium dioxide (TiO 2) is used as a classical semiconductor photocatalytic material, has extremely wide application in the field of photocatalysis research due to the outstanding advantages of stable chemical property, strong anti-photo-corrosion capability, no toxicity, low cost, abundant reserves and the like, and is regarded as a reference material in the field. However, the inherent physicochemical properties of titanium dioxide themselves severely limit its photocatalytic performance. First, its wide forbidden bandwidth determines that it can only respond to ultraviolet light with high energy but small duty ratio in solar spectrum, and can not effectively utilize visible light with 43% of solar energy, which causes great waste of solar energy resources. Secondly, the photo-generated electron-hole pairs are rapidly compounded in the titanium dioxide body and on the surface, so that the number of effective carriers participating in the surface oxidation-reduction reaction is greatly reduced, and the quantum efficiency is generally low. These problems severely restrict the performance of unmodified pure-phase titania photocatalysts in practical applications. Therefore, the titanium dioxide must be subjected to effective physical or chemical modification, so that the spectral response range of the titanium dioxide is widened, the recombination of photo-generated carriers is inhibited, and the photo-catalytic activity of the titanium dioxide can be remarkably improved, so that the requirements of practical application are met. The method provides an effective solution for breaking through the bottleneck that the traditional photocatalyst (such as titanium dioxide) has low sunlight utilization efficiency and rapid carrier recombination, and the plasmon material with the localized surface plasmon resonance effect. Among them, titanium nitride (TiN) is regarded as an ideal choice for constructing a high-performance composite photocatalyst because of its wide LSPR absorption range, low cost, high thermal stability and chemical stability. However, the interface between the plasma material and the semiconductor photocatalyst has a large carrier transport barrier, resulting in low carrier separation efficiency and undesirable hydrogen evolution rate of the photocatalyst. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a TiN/N-TiO 2 photocatalytic composite material for hydrogen production by decomposing water, a preparation method and application thereof, and solves the technical problems that in the prior art, a large carrier transmission barrier exists at an interface between a plasma material and a semiconductor photocatalyst, so that the carrier separation efficiency is low, and the hydrogen evolution rate of the photocatalyst is to be improved. In order to solve the technical problems, the invention adopts the following technical scheme: A preparation method of