Iron Selenide Particles for High-Performance Supercapacitors.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Iron (II) selenide (FeSe) is known for high-temperature superconductivity.
• FeSe is gaining attention for electrical energy storage (EES) due to its advantages.

Purpose of the Study:

• To synthesize FeSe nanoparticles using a cost-effective solvothermal method.
• To evaluate the electrochemical performance of FeSe as a supercapacitor electrode.

Main Methods:

• Solvothermal synthesis of FeSe nanoparticles.
• Electrochemical characterization using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS).

Main Results:

• High capacitance of 280 F/g at 0.5 A/g.
• Energy density of 39 Wh/kg and power density of 306 W/kg at 0.5 A/g.
• Excellent cycling stability with 92% capacitance retention after 30,000 cycles at 1 A/g.
• Low equivalent series resistance (R_ESR) of ~2 Ω.

Conclusions:

• The synthesized FeSe nanoparticles exhibit superior electrochemical properties for supercapacitor applications.
• The solvothermal method is effective for producing high-performance FeSe electrodes.
• FeSe is a promising material for advanced electrical energy storage devices.