Bimetal-organic frameworks derived redox-type composite materials for high-performance energy storage

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Supercapacitors require advanced electrode materials for high performance.
• Bimetal-organic frameworks (Bi-MOFs) offer unique geometric properties for electrochemical applications.

Purpose of the Study:

• To synthesize novel electrode materials from Bi-MOFs for high-performance hybrid supercapacitors.
• To investigate the electrochemical properties and stability of the synthesized materials.

Main Methods:

• Utilized bimetal-organic frameworks (ZIF-8@ZIF-67) as sacrificial precursors.
• Synthesized hollow NiMn(CO3)0.5·0.11H2O/ZnO@Co3O4 CNCs (NM-CH/ZnO@Co3O4 CNCs) via low-temperature treatment.
• Constructed a hybrid supercapacitor using the synthesized material as cathode and activated porous carbon as anode.

Main Results:

• The NM-CH/ZnO@Co3O4 CNCs exhibited a specific capacity of 196.3 ± 0.08 mAh/g and specific capacitance of 1179 ± 0.10 F/g.
• Achieved outstanding cycling stability with 98% retention after 25,000 cycles.
• The hybrid supercapacitor delivered a specific energy of 33 ± 0.12 Wh/kg and power density of 19354 ± 0.07 W/kg.

Conclusions:

• The porous, hollow structure and large surface area of NM-CH/ZnO@Co3O4 CNCs enhance electrochemical performance.
• Bi-MOF-derived electrodes offer a promising pathway for developing high-performance energy storage solutions.
• Demonstrated potential for industrial energy storage applications by powering portable lightbulbs.