Fabricating stable quinoline-linked phenothiazine-based covalent organic frameworks for flexible supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Covalent organic frameworks (COFs) offer tunable properties for energy storage.
• MXene and carbon nanotube (CNT) composites enhance electrode performance.
• Developing stable and high-performance flexible supercapacitors is crucial for portable electronics.

Purpose of the Study:

• To construct a novel quinoline-linked phenothiazine-based covalent organic framework (QCOF).
• To fabricate a MXene/QCOF@CNT electrode for flexible supercapacitors.
• To evaluate the electrochemical performance and stability of the fabricated electrode.

Main Methods:

• Synthesis of a stable quinoline-linked phenothiazine-based covalent organic framework (QCOF).
• Fabrication of a composite electrode using MXene, QCOF, and carbon nanotubes (CNTs).
• Electrochemical testing of the flexible supercapacitor device.

Main Results:

• The MXene/QCOF@CNT electrode achieved an energy density of 11 Wh kg^-1 at 250 W kg^-1.
• The supercapacitor exhibited 100% capacitance retention after 5000 charge-discharge cycles.
• The high stability of the QCOF composite contributed to the excellent cycling performance.

Conclusions:

• The developed QCOF material is highly stable and suitable for energy storage applications.
• The MXene/QCOF@CNT composite electrode demonstrates promising potential for high-performance flexible supercapacitors.
• This work highlights the effectiveness of QCOF-based materials in achieving durable and efficient energy storage solutions.