Exceptional Pseudocapacitive Behavior of 2D NiS and CoS Electrodes for Supercapacitors
ADVANCED MATERIALS TECHNOLOGIES, cilt.11, sa.9, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 11 Sayı: 9
- Basım Tarihi: 2026
- Doi Numarası: 10.1002/admt.202501605
- Dergi Adı: ADVANCED MATERIALS TECHNOLOGIES
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
- Anahtar Kelimeler: CV-GCD-EIS, Dunn method, FESEM, NiS-CoS, XRD
- Eskişehir Osmangazi Üniversitesi Adresli: Evet
Özet
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.