FeNP@MIL-101(Fe)-Based Carbon Nanotube Composite for Energy Storage Applications.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) offer high porosity and charge storage capacity for energy applications.
• Enhancing MOF performance through modification is crucial for expanding their application potential.
• Iron nanoparticle (FeNP) embedded in MIL-101(Fe) and carbon nanotube (CNT) nanocomposites are synthesized.

Purpose of the Study:

• To synthesize and characterize FeNP@MIL-101(Fe)/CNT nanocomposites.
• To investigate the electrochemical charge storage performance of these nanocomposites as supercapacitor electrodes.
• To evaluate the potential of these materials for energy storage applications.

Main Methods:

• Solvothermal synthesis of hierarchical micromesoporous structures.
• Fabrication of FeNP@MIL-101(Fe)/CNT nanocomposites.
• Electrochemical characterization using various techniques in 1 M KOH solution.

Main Results:

• High capacitance of 1305 F g^-1 at 1 A g^-1 and 95.7% capacitance retention after 10,000 cycles.
• Achieved energy density of 98.65 Wh kg^-1 and power density of 9000 W kg^-1 in a symmetric two-electrode system.
• Superior performance attributed to combined microporous/mesoporous structures, increased surface area, and enhanced electrical conductivity.

Conclusions:

• FeNP@MIL-101(Fe)/CNT nanocomposites exhibit excellent electrochemical properties for supercapacitor applications.
• The integration of FeNP@MIL-101(Fe) with CNT improves ion diffusion and exposes more redox-active sites.
• These findings highlight the potential of MOF-based nanocomposites for high-performance energy storage.