Multifunctional copper sulfide nanoflowers for superior supercapacitors and microwave absorption

Area of Science:

• Materials Science
• Electrochemistry
• Electromagnetics

Background:

• Developing multifunctional materials is crucial for advanced energy storage and electromagnetic shielding.
• Copper sulfide compounds offer compositional diversity and tunable morphology for these applications.

Purpose of the Study:

• To synthesize copper sulfide compounds with controlled morphologies using a hydrothermal method.
• To evaluate their performance in electrochemical energy storage and electromagnetic wave absorption.

Main Methods:

• Hydrothermal synthesis with adjustable solvent composition (ethylene glycol and water).
• Characterization using XRD, SEM, TEM, XPS, FTIR, and BET.
• Electrochemical testing in two-electrode and three-electrode configurations.
• Microwave absorption measurements.

Main Results:

• CuₓS-40 exhibited a specific capacitance of 796.6 F g⁻¹ at 1 A g⁻¹.
• CuₓS-40 demonstrated excellent cycling stability (100% retention after 5000 cycles at 10 A g⁻¹).
• CuₓS-60 achieved a minimum reflection loss of -43.20 dB with a 5.52 GHz effective absorption bandwidth.

Conclusions:

• Copper sulfide compounds possess significant potential for dual applications in energy storage and electromagnetic shielding.
• CuₓS-40 is effective for energy storage devices, powering an LED.
• CuₓS-60 shows excellent microwave absorption capabilities.