Core-shell CuO@NiCoMn-LDH supported by copper foam for high-performance supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Core-shell nanostructures offer enhanced electrochemical properties.
• Layered double hydroxides (LDHs) are promising electrode materials.
• Synergistic effects between different nanomaterials can improve device performance.

Purpose of the Study:

• To synthesize and characterize a core-shell CuO@NiCoMn-LDH electrode.
• To investigate the role of manganese content in optimizing electrode performance.
• To evaluate the electrochemical performance and cycling stability of the electrode for supercapacitor applications.

Main Methods:

• Wet chemistry, calcination, and electrodeposition for electrode synthesis.
• Electrochemical testing including specific capacity, rate capability, and cycling stability.
• Fabrication and testing of an asymmetric supercapacitor (ASC) device.

Main Results:

• The CuO@NiCoMn-LDH electrode exhibits a high specific capacity of 2.66 mA h cm^-2 at 10 mA cm^-2.
• The optimized electrode shows excellent cycling stability with 94.82% capacity retention after 3000 cycles.
• The fabricated ASC device achieves a maximum energy density of 2.67 mW h cm^-2 and powers an LED for 15 minutes.

Conclusions:

• The core-shell CuO@NiCoMn-LDH electrode demonstrates significant potential for high-performance energy storage.
• Manganese content is crucial for tuning the morphology and electrochemical properties of the electrode.
• The binder-free electrode and ASC device show practical applicability in energy storage solutions.