Defective NH2-Ni-MOF, preparation method and application

By introducing defects and piezoelectric effects into MOF materials and using mechanical ball milling to break metal-ligand bonds to form a hierarchical porous structure, the problem of photogenerated electron-hole pair recombination was solved, significantly improving the catalytic performance of the photocatalyst. In particular, in piezoelectric photocatalytic water splitting for hydrogen production, efficient and stable water splitting hydrogen production was achieved.

CN121362335APending Publication Date: 2026-01-20GUANGDONG CARBON LANGUAGE NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202511479468.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-16
Publication Date
2026-01-20

AI Technical Summary

Technical Problem

The severe recombination of photogenerated electron-hole pairs in existing MOF photocatalysts limits their photocatalytic efficiency, and traditional modification strategies are unable to significantly improve performance.

Method used

Defects are introduced into MOF materials by mechanical ball milling. High-energy collisions and shear forces are used to break metal-ligand bonds, forming a hierarchical porous structure and defect sites. Combined with the piezoelectric effect, this enhances the separation of photogenerated carriers and catalytic activity.

Benefits of technology

It significantly improves the photocatalytic performance of MOFs materials, especially in the piezoelectric photocatalytic water splitting hydrogen production process, by improving the separation efficiency and catalytic activity of photogenerated carriers, reducing the electron transport resistance of the materials, and achieving efficient and stable water splitting hydrogen production.

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Abstract

The invention discloses defective NH2-Ni-MOF as well as a preparation method and application thereof, and belongs to the field of piezoelectric electro-catalytic hydrogen production. The method comprises the following steps: firstly, synthesizing a precursor NH2-Ni-MOF through a solvothermal method, putting the NH2-Ni-MOF material and a grinding ball into a ball mill together by a seller, and grinding to obtain defective NH2-Ni-MOF; and the grinding ball is a mixture of five large balls with the diameter of 10 mm and fifteen small balls with the diameter of 5 mm. The D3-NH2-Ni-MOF prepared by mixing and grinding the grinding balls in a specific proportion realizes the synergistic effect of high-energy impact and high-frequency grinding, and successfully introduces lattice defects with the maximum concentration. The defect structure can effectively promote separation and migration of photon-generated carriers and enhance the piezoelectric polarization effect of the material under the ultrasonic action, so that the piezoelectric synergistic photocatalytic performance is remarkably improved. Under the combined action of sun illumination and ultrasonic vibration, the D3-NH2-Ni-MOF catalyst is dispersed in a methanol aqueous solution, and efficient and stable water decomposition hydrogen production activity can be achieved.
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