NiCo2S4@NiCo2Se4in situ grown on carbon cloth for performance-enhanced supercapacitor electrodes

Abstract

Fabrication of high-performance and cycling-stable energy storage devices is a research hotspot for addressing energy crises and environmental issues. This study reports the synthesis of NiCo₂S₄@NiCo₂Se₄via in situ growth on carbon cloth (CC) using a three-step hydrothermal method. The NiCo₂S₄@NiCo₂Se₄ composite exhibits remarkable electrochemical performance, achieving a maximum specific capacitance of 12.87 F cm⁻² at a current density of 1 mA cm⁻², which is 2.91 times higher than that of pure NiCo₂S₄. Furthermore, the cycling stability of NiCo₂S₄@NiCo₂Se₄ prepared at 180 °C is noteworthy, retaining 94.2% of its initial capacitance after 10 000 cycles. An asymmetric supercapacitor was effectively constructed utilizing the NiCo₂S₄@NiCo₂Se₄ composite as the cathode and activated carbon (AC) as the anode. The NiCo₂S₄@NiCo₂Se₄//AC device demonstrated an energy density of 45.24 W h kg⁻¹ at a power density of 1543.2 W kg⁻¹. The NiCo₂S₄@NiCo₂Se₄ electrode, with its excellent electrochemical properties, shows promising potential for application in the wearable device field.