Akademik Veri Yönetim Sistemi
ADVANCED MATERIALS TECHNOLOGIES, 2026 (SCI-Expanded, Scopus)
The practical application of NiS and CoS powders in supercapacitor electrodes is often hindered by stacking and agglomeration effects. This study introduces a simplified, energy-efficient strategy for fabricating 2D NiS and CoS electrodes with enhanced electrochemical performance. A single-stage hydrothermal procedure was used to directly grow NiS and CoS on Ni foam. XRD and FESEM analyses confirmed the formation of a single-phase hexagonal NiS with nanoleaf morphology, while CoS exhibited an amorphous structure composed of wall-like nanosheet architectures. Electrochemical characterization revealed that the redox behavior of NiS was dominated by the Ni3+/Ni2+ couple, whereas CoS displayed redox transitions involving both Co4+/Co3+ and Co3+/Co2+ couples. NiS and CoS delivered exceptional specific capacitances of 3386 and 2166 F g-1 at 1 A g-1, respectively. Notably, CoS retained 93% of its capacity for over 4000 cycles at 2 A g-1 and delivered consistent performance at current densities of up to 200 A g-1. The synergistic effect of EDLC and faradaic reactions enhanced CoS's cycling stability and capacitance beyond previously reported values. This simple synthesis strategy enables high-performance NiS and CoS electrodes without complex doping or heterostructure engineering, offering strong potential for next-generation hybrid supercapacitors.