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 solidstate 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 /CCassembled FSS device also exhibits high cycling stability with an excellent capacity retention of ∼85.59% after 5000 cycles.
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