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Zn-Co Sulfide Microflower Anchored on Three-Dimensional Graphene as High Capacitance and Long Cycle Life Electrode for Asymmetric Supercapacitors.

Zn-Co double metal sulfide as high energy density Faradic electrode material has great potential for supercapacitors, but its poor transmission efficiency of electron and ions hinders its electrochemical response. Herein, the ZnCo2(CO3)1.5(OH)3@ZCS microflower hybrid arrays consisting of the thin nanolayer petals are anchored on three-dimensional graphene (ZnCo2(CO3)1.5(OH)3@ZCS/3DG) via a simple and feasible hydrothermal method and additional ion-exchange process. ZnCo2(CO3)1.5(OH)3@ZCS/3DG electrode delivers high capacitance (2228 F g-1 at 1 A g-1) and long cycling life (85.7% after 17000 cycles), compared with the state-of-the-art mixed transition metal compounds, which is ascribed to the multicomponent structural design. 3DG conductive substrate improves the electron transmission dynamics of the electrode material. Meanwhile, the special microflower consisting of the thin nanolayer petals could not only provide much active sites for ions improving the capacitance, but also alleviate the volume expansion ensuring the structural stability. Furthermore, the ZnCo2(CO3)1.5(OH)3@ZCS/3DG electrode based all-solid-state asymmetric supercapacitor achieves a high energy density of 27 Wh kg-1 at 528.3 W kg-1 and exhibits exceptional cyclic stability for 23000 cycles. It could light a blue LED for 9 minites to verify the practical application feasibility for energy storage devices.