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

Abstract

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.