Choulong Veann, Thongsuk Sichumsaeng, Ornuma Kalawa, Narong Chanlek, Pinit Kidkhunthod, Santi Maensiri
Delafossite AgFeO2 nanoparticles with a mixture of 2H and 3R phases were successfully fabricated by using a simple co-precipitation method. The resulting precursor was calcined at temperatures of 100, 200, 300, 400, and 500°C to obtain the delafossite AgFeO2 phase. The morphology and microstructure of the prepared AgFeO2 samples were characterized by using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), N2 adsorption/desorption, X-ray absorption spectroscopy (XAS), and X-ray photoelectron spectroscopy (XPS) techniques. A three-electrode system was employed to investigate the electrochemical properties of the delafossite AgFeO2 nanoparticles in a 3 M KOH electrolyte. The delafossite AgFeO2 nanoparticles calcined at 100°C (AFO100) exhibited the highest surface area of 28.02 m2·g−1 and outstanding electrochemical performance with specific capacitances of 229.71 F·g−1 at a current density of 1 A·g−1 and 358.32 F·g−1 at a scan rate of 2 mV·s−1. This sample also demonstrated the capacitance retention of 82.99% after 1000 charge/discharge cycles, along with superior specific power and specific energy values of 797.46 W·kg−1 and 72.74 Wh·kg−1, respectively. These findings indicate that delafossite AgFeO2 has great potential as an electrode material for supercapacitor applications. © University of Science and Technology Beijing 2025.
School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand; SUT Center of Excellence on Advanced Functional Materials, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand; Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand; Department of Physics, Universitas Negeri Malang, Malang, 65145, Indonesia
