CuCoNi-S anchored CoMoO₄/MoO₃ forming core-shell structure for high-performance asymmetric supercapacitors.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Fabricating multi-component transition metal sulfides/oxides core-shell structures for high-performance electrodes remains a challenge.
• Existing electrode materials often struggle to achieve excellent electrochemical properties.

Purpose of the Study:

• To synthesize a novel multi-component transition metal sulfides/oxides core-shell structure electrode.
• To evaluate the electrochemical performance and energy storage capabilities of the new material.

Main Methods:

• Facile hydrothermal and electrodeposition methods were employed for synthesis.
• The synthesized material, CoMoO4/MoO3@CuCoNi-S, was grown on nickel foam (NF).
• Electrochemical performance was assessed using techniques like specific capacitance and cycling stability tests.

Main Results:

• The CoMoO4/MoO3@CuCoNi-S electrode exhibited a high specific capacitance of 2600.0 F g⁻¹ at 1 A g⁻¹.
• The electrode maintained 68.3% of its initial capacitance at 10 A g⁻¹.
• An assembled device (CoMoO4/MoO3@CuCoNi-S//active carbon) demonstrated a high energy density (42.1 W h kg⁻¹), a 1.6 V voltage window, and 96.9% capacitance retention after 5000 cycles.

Conclusions:

• The study successfully developed a multi-component transition metal sulfides/oxides core-shell structure with exceptional electrochemical performance.
• The novel electrode material shows significant promise for advanced energy storage applications.
• This work provides a valuable reference for designing similar composite materials for energy storage.