Photoanode material based on covalent organic framework as well as preparation method and application of photoanode material

Abstract

The invention belongs to the field of material preparation, and discloses a photoanode material based on a covalent organic framework as well as a preparation method and application of the photoanode material. The material comprises a cocatalyst, and thecovalent organic framework based on a triazine structure; the cocatalyst and the covalent organic framework based on the triazine structure are stacked layer by layer to form a two-dimensional layered structure, and preferably, the cocatalyst is MoS2. The covalent organic framework material based on the triazine structure has high crystallinity, high specific surface area and good chemical stability, can serve as an excellent heterogeneous photocatalyst due to the fact that the content of the N component is rich and the visible light absorption property is high; and in addition, the covalent organic framework material is combined with the cocatalyst, the cocatalyst and the covalent organic framework (TTZ-COF) based on the triazine structure are stacked layer by layer to form the two-dimensional layered structure; and the two-dimensional layered structure is used as the photoanode material, so that the light utilization rate of the photoanode material can be effectively improved, and the efficiency of photolysis of water is ensured.

Description

technical field

[0001] The invention belongs to the field of material preparation, and more specifically relates to a photoanode material based on a covalent organic framework and its preparation method and application. Background technique

[0002] To cope with global warming and the sustainable demand for alternative fuels, solar-driven photoelectrochemical water splitting has attracted extensive attention as a forward-looking solution for green, sustainable renewable and alternative energy.

[0003] In the photoelectrochemical water splitting process, the surface of the photoactive material absorbs light under the action of light, and obtains energy to generate photogenerated electrons and holes. Under the action of bias voltage, the photogenerated electrons and holes are separated and participate in the hydrogen evolution on the photocathode respectively. reaction (HER) and oxygen evolution reaction (OER) on the photoanode. The main challenge of this system is how to ac...

Examples

Embodiment 1

[0034] A photoanode material based on a covalent organic framework, including a cocatalyst and a covalent organic framework based on a triazine structure; wherein, the cocatalyst and the covalent organic framework based on a triazine structure form a two-dimensional layered structure through layer-by-layer stacking .

[0035] Covalent organic framework materials based on the triazine structure have high crystallinity, high specific surface area and good chemical stability, and due to the rich content of N components, they have strong visible light absorption properties and can be used as excellent heterogeneous photocatalysts. , this example proposes a two-dimensional layered structure composed of a cocatalyst and a covalent organic framework TTZ-COF through layer-by-layer stacking, as a photoanode material, the structure is as follows figure 1 As shown, each ring represents one of the above structural units. Among them, the covalent organic framework in the photoanode materi...

Embodiment 2

[0041] A method for preparing a photoanode material based on a covalent organic framework as described in Example 1, comprising: cocatalyst, 4,4',4"-(1,3,5-triazine-2,4, 6-triyl)triphenylamine and 4,4',4"-(1,3,5-triazine-2,4,6-triyl)tri[benzaldehyde] into the 1,4-dioxahexa ring, mesitylene and acetic acid aqueous solution, and react at 100-130° C. for 3-5 days to prepare the photoanode material based on the covalent organic framework.

[0042]By introducing a co-catalyst, the co-catalyst / TTZ-COF co-catalyzed composite system synthesized by in situ reaction under solvothermal conditions can further enhance the light absorption of the composite photoanode material, improve the separation efficiency of photogenerated electrons and hole pairs, Accelerate the transfer of interfacial charges and show good photocatalytic water splitting activity, which makes the covalent organic framework material based on the triazine structure have good application potential in the field of photoca...

Embodiment 3

[0055] An application of a covalent organic framework-based photoanode material as described in Example 1 above for photoelectrochemical decomposition. Specifically, the application can be to cover the photoanode material based on the covalent organic framework described in Example 1 on the FTO substrate as an anode for photoelectrochemical water splitting.

technical field

[0001] The invention belongs to the field of material preparation, and more specifically relates to a photoanode material based on a covalent organic framework and its preparation method and application. Background technique

[0002] To cope with global warming and the sustainable demand for alternative fuels, solar-driven photoelectrochemical water splitting has attracted extensive attention as a forward-looking solution for green, sustainable renewable and alternative energy.

[0003] In the photoelectrochemical water splitting process, the surface of the photoactive material absorbs light under the action of light, and obtains energy to generate photogenerated electrons and holes. Under the action of bias voltage, the photogenerated electrons and holes are separated and participate in the hydrogen evolution on the photocathode respectively. reaction (HER) and oxygen evolution reaction (OER) on the photoanode. The main challenge of this system is how to ac...

Examples

Embodiment 1

[0034] A photoanode material based on a covalent organic framework, including a cocatalyst and a covalent organic framework based on a triazine structure; wherein, the cocatalyst and the covalent organic framework based on a triazine structure form a two-dimensional layered structure through layer-by-layer stacking .

[0035] Covalent organic framework materials based on the triazine structure have high crystallinity, high specific surface area and good chemical stability, and due to the rich content of N components, they have strong visible light absorption properties and can be used as excellent heterogeneous photocatalysts. , this example proposes a two-dimensional layered structure composed of a cocatalyst and a covalent organic framework TTZ-COF through layer-by-layer stacking, as a photoanode material, the structure is as follows figure 1 As shown, each ring represents one of the above structural units. Among them, the covalent organic framework in the photoanode materi...

Embodiment 2

[0041] A method for preparing a photoanode material based on a covalent organic framework as described in Example 1, comprising: cocatalyst, 4,4',4"-(1,3,5-triazine-2,4, 6-triyl)triphenylamine and 4,4',4"-(1,3,5-triazine-2,4,6-triyl)tri[benzaldehyde] into the 1,4-dioxahexa ring, mesitylene and acetic acid aqueous solution, and react at 100-130° C. for 3-5 days to prepare the photoanode material based on the covalent organic framework.

[0042]By introducing a co-catalyst, the co-catalyst / TTZ-COF co-catalyzed composite system synthesized by in situ reaction under solvothermal conditions can further enhance the light absorption of the composite photoanode material, improve the separation efficiency of photogenerated electrons and hole pairs, Accelerate the transfer of interfacial charges and show good photocatalytic water splitting activity, which makes the covalent organic framework material based on the triazine structure have good application potential in the field of photoca...

Embodiment 3

[0055] An application of a covalent organic framework-based photoanode material as described in Example 1 above for photoelectrochemical decomposition. Specifically, the application can be to cover the photoanode material based on the covalent organic framework described in Example 1 on the FTO substrate as an anode for photoelectrochemical water splitting.

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