Hydrothermal synthesis of the NiS@g-C3N4 nanohybrid electrode material for supercapacitor applications

Recent research on sustainable, efficient energy supply and storage systems has increased due to worries about energy constraints, pollution, and fossil fuel depletion. However, supercapacitors (SCs), revolutionary energy conversion and storage devices are attracting interest for high-power density and cyclic life. The present work reported the synthesis of NiS, g-C3N4 (g-CN) and NiS@g-CN hybrid using a straightforward hydrothermal technique. The NiS@g-CN hybrid material demonstrated improved cycling performance and rate capability, and experimental results revealed notable specific capacitance (Cs) of 933.78 F g−1 at 1 A g−1. However, electrochemical performance exhibited columbic efficiency (ղ) of 92.80 % with exceptional cyclic stability, maintaining its performance even after undergoing 5000th charge-discharge cycles with 97 % capacitive retention. In addition, it was worth noting that the NiS@g-CN hybrid shows a remarkably low resistance value (Rct = 55.97 Ω), indicating that the electrode showcases outstanding electrochemical performance as a hybrid supercapacitor. The findings of the present work demonstrate a novel approach to fabricating hybrid materials composed of metal sulfides and graphitic carbon nitride (g-C3N4), which hold significant applications in the manufacturing of electrochemical energy storage devices at large scale in different energy-saving equipment.