Heterostructured Nanocoral-like Co(OH)F@NiCo-LDH/Co₉S₈ Nanocomposites as Electrodes for Supercapacitors

Nanocoral arrays of Co(OH)F@NiCo-LDH/Co 9 S 8 have been successfully synthesized onto nickel foam via a solvothermal method. The prepared heterostructured nanocage demonstrates outstanding electrochemical properties such as excellent specific capacitance (3409 mC cm –2 at 1 mA cm –2 ) and superior capacity retention (96.38% retention after 7000 charge–discharge cycles at 10 mA cm –2 ). The asymmetrical supercapacitor fabricated by reduced graphene oxide and Co(OH)F@NiCo-LDH/Co 9 S 8 showed an excellent energy density of 37.2 W h kg –1 at a power density of 800 W kg –1 and superior capacity storage (87.63% retention after 5000 cycles of charge–discharge). This suggests that the composite has excellent performance for electrochemical supercapacitor applications. The unique combination of materials and structural design strategy employed highlight the significant advancements to develop high-performance supercapacitors, positioning this study at the cutting edge of nanomaterials research in energy applications.