Phosphorization Engineering on a MOF-Derived Metal Phosphide Heterostructure (Cu/Cu₃P@NC) as an Electrode for...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are promising for energy storage but suffer from poor conductivity.
• Developing conductive MOF-derived materials is crucial for enhancing electrode performance.
• Carbonaceous nanostructures can improve electronic and ionic transport in energy storage materials.

Purpose of the Study:

• To design and synthesize a novel 3D copper-based MOF (Cu-MOF).
• To develop a highly conductive MOF-derived heterostructure (CuP/Cu@NC) for energy storage applications.
• To investigate the electrochemical properties of the CuP/Cu@NC heterostructure as an electrode material.

Main Methods:

• Synthesis of a 3D Cu-MOF using a solvent diffusion method at ambient temperature.
• Low-temperature phosphorization of the Cu-MOF to create the CuP/Cu@NC heterostructure.
• Characterization using single-crystal X-ray diffraction.
• Electrochemical testing of the material in supercapacitors.

Main Results:

• A novel 3D Cu-MOF with a unique topology was successfully synthesized.
• The MOF-derived CuP/Cu@NC heterostructure exhibited enhanced electronic and ionic diffusion.
• The electrode delivered a specific capacity of 540 C g⁻¹ at 1 A g⁻¹, with 190 C g⁻¹ at 20 A g⁻¹.
• The asymmetric solid-state supercapacitor achieved an energy density of 45.5 Wh kg⁻¹ and power density of 7.98 kW kg⁻¹.

Conclusions:

• The CuP/Cu@NC heterostructure demonstrates superior electrochemical performance, including high capacity, rate capability, and cycle stability.
• The synergistic effects within the heterostructure significantly improve conductivity and ion transport.
• This MOF-derived material shows great potential for advanced supercapacitor applications.