Self-supported two-dimensional NiCo₂S₄ micro-spheres for ultra-high supercapacitor application via two-step methods: Electro-deposition and chemical vapor deposition Available to Purchase

A self-supported NiCo₂O₄ on Ni foam was prepared by electro-deposition method. Then the NiCo₂S₄ micro- spheres are derived by sulfurizing the NiCo₂O₄ using CVD at 300°C and explored its energy storage performance towards supercapacitor. Importantly this type of micro-sphere like geometry provides better exposure of redox active sites and more accessible surface area showing enhanced charge accumulation rate. These NiCo₂S₄ micro-spheres shows excellent charge storage performance in terms of very high specific capacitance value of 1111 F g⁻¹ at current density 20 A g⁻¹ and high energy density of 39 W h kg⁻¹ at power density 23 kW kg⁻¹ with a prolonged cycling stability over 5000 repeated cycles. Owing to excellent electrochemical performances, we presume that the as synthesized NiCo₂S₄ micro-spheres would be a permissible and efficient active electrode material for future energy storage systems.