NH₂-UiO-66 Coated with Two-Dimensional Covalent Organic Frameworks: High Stability and Photocatalytic Activity

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• NH2-UiO-66 exhibits poor stability and low catalytic activity in basic solutions, limiting its photocatalytic applications.
• Existing methods often require acidic conditions, restricting the material's environmental adaptability.

Purpose of the Study:

• To improve the stability and photocatalytic activity of NH2-UiO-66.
• To develop a hybrid material suitable for applications in alkaline environments.

Main Methods:

• Fabrication of NH2-UiO-66/COF hybrid material via Schiff base reaction.
• Coating NH2-UiO-66 with 2D covalent organic frameworks (COFs) using TAPT and TP.
• Testing photocatalytic hydrogen evolution in alkaline solution with triethanolamine as electron donor.

Main Results:

• The NH2-UiO-66/COF hybrid material showed high stability in alkaline conditions, with only 4.7% decomposition.
• Achieved an optimal photocatalytic H2 evolution rate of 8.44 mmol·h-1·g-1.
• Demonstrated enhanced photocatalytic activity and stability compared to bare NH2-UiO-66.

Conclusions:

• Coupling NH2-UiO-66 with COFs effectively enhances its photocatalytic performance and stability.
• The developed hybrid material is adaptable to alkaline environments, broadening its application potential.