Triazine covalent organic framework (COF)/θ-Al₂O₃ composites for supercapacitor application

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Supercapacitors require high-performance electrode materials for efficient energy storage.
• Covalent organic frameworks (COFs) show promise but suffer from poor conductivity.
• Developing conductive COF-based composites is crucial for advancing supercapacitor technology.

Purpose of the Study:

• To synthesize and characterize novel Al₂O₃@DHTA-COF composites for supercapacitor applications.
• To investigate the electrochemical properties and stability of these composite materials.
• To address the conductivity limitations of COFs in energy storage devices.

Main Methods:

• In situ growth of triazine-based DHTA-COF on a modified θ-Al₂O₃ substrate.
• Fabrication of Al₂O₃@DHTA-COF composite electrodes.
• Electrochemical testing, including specific capacitance and cycling stability measurements.

Main Results:

• The 50%Al₂O₃@DHTA-COF composite exhibited superior electrochemical properties.
• Specific capacitance values were 6.2 and 9.6 times higher than DHTA-COF and θ-Al₂O₃-CHO, respectively.
• The composite demonstrated excellent long-term cycling stability over 6000 charge-discharge cycles.

Conclusions:

• The Al₂O₃@DHTA-COF composite is a promising electrode material for high-performance supercapacitors.
• Integrating COFs with conductive substrates effectively enhances electrochemical performance.
• This work provides a valuable reference for developing advanced COF-based composite materials for energy storage.