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In situ growth of NiCo2S4@Ni3V2O8 on Ni foam as a binder-free electrode for asymmetric supercapacitors

A hierarchical NiCo2S4@Ni3V2O8 core/shell hybrid was in situ grown on nickel foam through a facile hydrothermal process combined with a simple co-precipitation method. Further characterization shows that the hybrid consists of highly conductive NiCo2S4 as the core and uniformly distributed Ni3V2O8 nanoparticles as the shell. When used as the binder-free electrode, the hybrid material takes advantage of both components and exhibits excellent electrochemical activity, demonstrating a higher specific capacity of 512 C g−1 at a current density of 1 A g−1 and a better rate capability of 396 C g−1 at 10 A g−1. The enhanced pseudocapacitive performance of the NiCo2S4@Ni3V2O8 hybrid is mainly attributed to its unique core/shell structure, which provides fast ion and electron transport. Finally, a NiCo2S4@Ni3V2O8//activated carbon asymmetric supercapacitor is successfully assembled and it can deliver a maximum energy density of 42.7 W h kg−1 at a power density of 200 W kg−1, making it a promising candidate for superior electrodes for supercapacitor applications.