LAUSR

A high-performance electrode for supercapcitors has been prepared by growing NiCo2S4 (NCS) nanosheets on SiO2@C core-shell nanospheres (SiO2@C-NCS nanocomposite) using simple yet effective solution-based method. Benefiting from the considerable combination and unique mesoporous structure with high surface area, SiO2@C-NCS nanocomposite as an electrode material for supercapacitor exhibited long-term stable cycling performance with high specific capacitance of 625 F g-1 at 1 mA cm-2. An asymmetric supercapcitor (ASC) assembled with SiO2@C-NCS as positive electrode and carbon nanotube paper (CNP) as negative electrode in aquoeous KOH solution can be cycled in a high-voltage region of 1.6 V, which resulted in a high energy density of 16 Wh kg-1 at an ultra-high specific power of 7200 W kg-1. These promising results suggest the possible application of mixed transition metal sulfides-based composites in high-performance asymmetric supercapacitors.