Microfluidic Printing of Vertically-Oriented Nanosheets/MOFs Hetero-Interface for Intensive Pseudocapacitive Storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Efficient manufacture of electroactive vertically-oriented nanosheets is critical for high energy density miniature supercapacitors.
• Challenges remain in achieving enhanced electrolyte mass diffusion and strong interfacial redox dynamics.

Purpose of the Study:

• To develop a method for controllably constructing vertically-oriented graphene/ZIF-67 hetero-microspheres (VAGS/ZIF-67).
• To investigate the electrochemical performance and energy storage capabilities of VAGS/ZIF-67 for supercapacitors.

Main Methods:

• Microfluidic droplet printing was employed to synthesize VAGS/ZIF-67.
• Computational fluid dynamics (CFD) and density functional theory (DFT) were used for verification.

Main Results:

• VAGS/ZIF-67 exhibits ordered porous channels, high electroactivity, and strong interfacial interaction.
• Achieved high specific capacitance (1674 F g^-1) and energy density (100 Wh kg^-1) in KOH solution.
• Demonstrated excellent durability over 10,000 cycles and stability at varying temperatures.

Conclusions:

• Microfluidic printing enables efficient fabrication of VAGS/ZIF-67 with superior electrochemical properties.
• VAGS/ZIF-67 based supercapacitors offer promising solutions for high-performance portable electronics.
• The developed material shows potential for advanced energy storage applications.