Fabrication of binary NiSe2–ZnS nanocomposites for high-performance supercapacitors with enhanced energy storage

The development of supercapacitor technology has advanced significantly because of the high need for efficient and sustainable energy storage solutions. This study investigates the synthesis and electrochemical performance of NiSe₂-ZnS nanocomposites as promising electrode materials for high-performance supercapacitor. The NiSe₂-ZnS nanocomposites were synthesized via simple chemical method, and characterized. The results showed that the NiSe₂-ZnS composite have outstanding electrochemical behaviors, combining the superior chemical stability and thermal durability of NiSe₂ with the remarkable electrical conductivity of ZnS. The NiSe₂-ZnS hybrid electrode demonstrated remarkable electrochemical behavior, delivering a specific capacitance of 810 F g^-1 in a three-electrode system and 87.3 F g^-1 when evaluated in a two-electrode configuration. It also demonstrated a notable energy density (ED) of 27.2 Wh/kg and a high power density (PD) of 3744.7 W/kg. Notably, the electrode retained 96.7% of its original capacitance even after 5000 continuous charge-discharge cycles conducted under a current load of 15 A g^-1, demonstrating excellent cycling durability. This research shows that NiSe₂-ZnS nanocomposites is a good-performance, low-cost, and sustainable material for next-generation supercapacitors.