Energies, Journal Year: 2025, Volume and Issue: 18(10), P. 2606 - 2606

Published: May 18, 2025

This study aims to develop high-performance nickel selenide (NiSe) electrodes via a controlled electrodeposition approach, optimizing the number of deposition cycles enhance electrochemical energy storage capabilities. Nickel were synthesized at varying (2CY–5CY) and systematically evaluated in both three-electrode asymmetric supercapacitor (ASC) configurations determine optimal cycle for superior performance. Among all, NiSe-3CY electrode demonstrated best characteristics, delivering high specific capacitance 507.42 F/g setup. It also achieved an density 22.89 Wh/kg power 584.61 W/kg, outperforming its 2CY, 4CY, 5CY counterparts. Notably, 3CY exhibited lowest series resistance (1.59 Ω), indicative enhanced charge transport minimal internal resistance. When integrated into ASC device (NiSe-3CY//activated carbon), it maintained 18.78 F/g, with 8.45 385.03 W/kg. Furthermore, impressive areal volumetric capacitances 351 mF/cm2 1.09 F/cm3, respectively, corresponding 0.49 mWh/cm3. Long-term cycling tests revealed excellent durability, retaining 91% initial capacity after 10k Coulombic efficiency 99%. These results confirm that is highly promising candidate next-generation systems, offering balanced combination capacitance, density, stability.

Language: Английский