MOF-on-MOF Derived Co₂P/Ni₂P Heterostructures for High-Performance Supercapacitors.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are versatile precursors for nanomaterial synthesis.
• Developing advanced electrode materials is crucial for high-performance energy storage devices.

Purpose of the Study:

• To synthesize a novel Co2P/Ni2P heterostructure on nickel foam (NF) using a MOF-on-MOF strategy.
• To evaluate the supercapacitor performance of the fabricated Co2P/Ni2P/NF composite.

Main Methods:

• Growth of Ni-MOF nanosheets on Ni foam substrate.
• Nucleation and growth of Prussian blue analogues (PBA) nanocubes on Ni-MOF to form a PBA/Ni-MOF film.
• Conversion of the film into a Co2P/Ni2P heterostructure on NF.

Main Results:

• The Co2P/Ni2P/NF composite delivered a high specific capacity of 5124.2 mF cm-2 at 1 mA cm-2.
• Remarkable capacity retention of 80.69% after 3000 cycles at 10 mA cm-2 was achieved.
• An asymmetric supercapacitor demonstrated a maximum energy density of 0.34 mWh cm-2 at 1.50 mW cm-2.

Conclusions:

• The synergistic effects of Co2P and Ni2P components and the hierarchical structure enhance supercapacitor performance.
• This synthetic strategy provides an effective route for fabricating phosphide-based hybrid materials for supercapacitors.