Unfortunately, the heterogeneouscomponent could lead to changes of nickel cobalt sulfides onmorphology, porosity, active surface area, atomic bonding environment and even valence states that affect the supercapacitiveproperties. As a result, it will become more difficult to explore thesynergistic mechanism of the nickel and cobalt, because of thelimited experimental data. From this point of view, tuning thecomposition of hybrid materials from the atomic ratios of metals tothe content of heterogeneous components is essential to developthe nickel cobalt sulfides-based materials for high performancesupercapacitor