Hollow Opening Morphology Engineering and Fe/Cu Doping for High Performance MOF Electrode Materials

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Growing demand for efficient energy storage solutions.
• Metal-organic frameworks (MOFs) show promise as supercapacitor electrode materials.

Purpose of the Study:

• To synthesize and investigate Ni-MOFs as supercapacitor electrode materials.
• To evaluate the electrochemical performance of undoped and Cu/Fe-doped Ni-MOFs.
• To explore the potential of MOFs for practical energy storage applications.

Main Methods:

• Controlled synthesis of Ni-MOFs with hawthorn-shaped hollow structures using emulsion interfacial reaction and solvothermal methods.
• Electrochemical performance evaluation of undoped, Cu-doped, and Fe-doped Ni-MOFs.
• Fabrication and testing of asymmetric supercapacitor devices.

Main Results:

• Fe and Cu doping introduced additional pore architectures and active sites, enhancing charge transfer, ion diffusion, and pseudocapacitive behavior.
• Fe-Ni-MOF exhibited the highest mass capacitance (613 C g^-1 at 0.8 A g^-1).
• The asymmetric supercapacitor Fe-Ni-MOF//AC achieved an energy density of 34.75 Wh kg^-1 at a power density of 160 W kg^-1.

Conclusions:

• Doping Ni-MOFs with Fe and Cu significantly improves their electrochemical performance for supercapacitors.
• Fe-Ni-MOF demonstrates excellent potential as a high-performance electrode material.
• This research contributes to the design and optimization of MOFs for advanced energy storage devices.