Hierarchical WS(2)@NiCo(2)O(4) Core–shell Heterostructure Arrays Supported on Carbon Cloth as High-Performance Electrodes for Symmetric Flexible Supercapacitors

[Image: see text] Nowadays, rationally preparing heterostructure materials can not only make up for the shortage of individual components, but also exert unexpected performance through synergistic interactions between the components. Herein, a core–shell of WS(2)@NiCo(2)O(4) screw-like heterostructure arrays grown on carbon cloth (CC) was prepared by a two-step solvothermal method for supercapacitors. As a binder-free flexible electrode, a high areal capacitance of 2449.9 mF cm(–2) can be achieved for WS(2)@NiCo(2)O(4)/CC at a current density of 1 mA cm(–2). Benefiting from the core–shell of the WS(2)@NiCo(2)O(4) heterostructure, the capacitive property of the flexible WS(2)@NiCo(2)O(4)/CC electrode is better than those of WS(2)/CC and NiCo(2)O(4)/CC electrodes. Based on WS(2)@NiCo(2)O(4)/CC electrodes, the assembled flexible solid-state symmetric supercapacitor (FSS) device shows a high energy density of ∼45.67 W h kg(–1) at a power density of 992.83 W kg(–1). Meantime, the WS(2)@NiCo(2)O(4)/CC-assembled FSS device also exhibits high cycling stability with an excellent capacity retention of ∼85.59% after 5000 cycles.