Metal-Organic Framework-Derived CoO/Carbon Composite Array for High-Performance Supercapacitors.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) and their derivatives are key materials for energy storage applications.
• Developing efficient fabrication methods for MOF-derived materials is crucial for enhancing device performance.

Purpose of the Study:

• To demonstrate a novel solvent-free method for fabricating CoO/carbon composite arrays from ZIF-67.
• To evaluate the electrochemical performance of these arrays in asymmetric supercapacitors.

Main Methods:

• Electrodeposition of Co metal arrays followed by MOF-CVD to form ZIF-67/Co composite arrays.
• Regulated calcination of the composite arrays to yield CoO/carbon composite arrays.
• Fabrication and testing of asymmetric supercapacitors using the prepared electrodes.

Main Results:

• The CoO/carbon composite arrays exhibit a less tortuous ion diffusion pathway, high pseudocapacitance, and excellent electrical conductivity.
• Array electrodes without adhesives showed improved electrochemical performance.
• The fabricated electrode demonstrated high energy density, high power density, superior rate capability, and long cycle life.

Conclusions:

• MOF-derived CoO/carbon composite arrays are promising materials for high-performance asymmetric supercapacitors.
• The solvent-free fabrication method offers an efficient route to advanced energy storage materials.
• These materials hold potential for future power source applications.