Vertically oriented Ni-MOF@Co(OH)₂ flakes towards enhanced hybrid supercapacitior performance.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Two-dimensional (2D) materials offer excellent interlayer spacing for ion intercalation, making them promising for hybrid supercapacitors (HSCs).
• Integrating different 2D materials can enhance electrochemical performance, but requires careful consideration of ion diffusion and electron transfer pathways.

Purpose of the Study:

• To develop an efficient strategy for compositing cobalt hydroxide (Co(OH)2) and Ni-based MOF (Ni-MOF-24).
• To create a vertically oriented Ni-MOF@Co(OH)2 array for improved electrochemical performance in HSCs.

Main Methods:

• A two-step synthesis strategy was employed to create a vertically oriented Ni-MOF@Co(OH)2 array on nickel foam.
• The electrochemical performance of the composite material and the assembled HSC was evaluated.

Main Results:

• The Ni-MOF@Co(OH)2 composite achieved a maximum specific capacitance of 1448 Fg-1 at 2 Ag-1.
• The assembled hybrid Ni-MOF@Co(OH)2//AC HSC delivered a high specific power of 22,400 W kg-1 and a specific energy of 45.7 Wh kg-1.

Conclusions:

• The developed Ni-MOF@Co(OH)2 composite material demonstrates excellent potential for high-performance hybrid supercapacitors.
• The compositing strategy effectively preserves ion diffusion channels and accelerates electron transfer, leading to superior electrochemical properties.