Akademik Veri Yönetim Sistemi
JOURNAL OF POWER SOURCES, cilt.674, 2026 (SCI-Expanded, Scopus)
Although nickel hydroxide (Ni(OH)2) offers high theoretical capacity for supercapacitors, its practical deployment is often hindered by its intrinsic conductivity limitations and structural degradation. Herein, we introduce a robust, binder-free electrode architecture designed to circumvent these bottlenecks via the radio-frequency magnetron sputtering (RFMS) of a nickel sulfide (Ni3S2) film on nickel foam along with an in-situ electrochemical activation strategy. Unlike traditional methods, we utilize a sputtered nickel sulfide (Ni3S2) precursor that undergoes a controlled oxidative transformation during cycling, evolving into a highly active and mechanically stable Ni(OH)2 phase. This conversion process preserves nanoscale morphology while ensuring intimate electrical contact with the current collector, effectively eliminating the contact resistance issues in binderbased systems. The optimized electrode demonstrates a superior areal capacitance of 590 mF cm- 2 at 1 mA cm- 2, corresponding to an outstanding gravimetric capacitance of 3562 F g- 1. Furthermore, a hybrid supercapacitor device assembled with a graphene-based negative electrode delivers an areal capacitance of 204.2 mF cm- 2, instead of degrading, the device exhibits an "electro-activation" phenomenon, yielding a 14.7% increase in capacitance after 5,000 charge-discharge cycles. These results substantiate the efficacy of the in-situ conversion route as a scalable and superior alternative to chemical routes for developing high-durability energy storage systems.