Multi-dimensional Ni(OH)2/(Ni(OH)2(NiOOH).167).857@Ni3S2 hierarchical structure for high-performance asymmetric supercapacitor

A three-phase Ni(OH)2/(Ni(OH)2(NiOOH).167).857@Ni3S2 (Ni(O)OH@Ni3S2-1.0) integrated hierarchical structure on Ni foam was successfully prepared by a one-pot hydrothermal strategy. The formation mechanism is discussed by exploring the effect of S element content and hydrothermal time on the products. Benefiting from the synergistic effect between multi-dimensional nanomaterials, the Ni(O)OH@Ni3S2-1.0 composite electrode can deliver a high areal capacitance (11.88F cm−2 at 2 mA cm−2), displaying remarkable electrochemical behaviour.