Construction of hierarchical CoS nanowire@NiCo2S4 nanosheet arrays via one-step ion exchange for high-performance supercapacitors

摘要: In this paper, using CoS@ NiCo2S4 as an example, we report the successful design and synthesis of a novel hierarchical core/shell metal sulfide with conductive CoS on nickel foam via a facile ion exchange process. The prepared sulfide core/shell nanoarrays exhibit superior redox reactivity for supercapacitors. High areal capacitances of 7.62 F cm− 2 (almost a 2.5-fold enhancement compared with the CoO nanowire@ NiCo2O4 sheet arrays) at a scan rate of 5 mA cm− 2 and even 5.52 F cm− 2 at 30 mA cm− 2 were achieved. The …