ZnCo₂S₄ nanowire electrode enables long-life electrochemical capacitors

Bimetallic/polymetallic cobaltite possesses abundant redox reactions, high conductivity and theoretical capacity. This feature makes them a research focus of electrode materials for capacitor. In this study, we synthesize ZnCo₂S₄ nanowires grown uniformly on Ni substrate through a controllable two-step hydrothermal strategy. The synthesized samples are used as cathode materials. The assembled supercapacitor delivers a specific capacitance of 81.66 C g⁻¹ at a current density of 0.5 A g⁻¹. It keeps 73% of the initial capacitance after 15000 times cycling and an energy density of 85 Wh kg⁻¹ at 2970 W kg⁻¹. These properties indicate their potential applications in future portable micro/nano and high-performance electrochemical devices.