Toward a high performance asymmetric hybrid capacitor by electrode optimization

Abstract

Molybdenum disulfide (MoS₂) is an extremely promising electrode material for supercapacitors due to its superior electrochemical performance and conductivity. In this study, polypyrrole (PPy) modified MoS₂/Ni₃S₂ (MNS@PPy) assemblies grown directly on the Ni foam (NF) substrate are prepared by a facile hydrothermal route and a subsequent electrodeposition process. The as-obtained products show a specific capacitance of 845 C g⁻¹ at 1 A g⁻¹ with outstanding cycling stability after 10 000 cycles. Using the as-synthesized products as positive materials, an assembled hybrid capacitor delivers an energy density of 280.5 W h kg⁻¹ at a power density of 2845 W kg⁻¹, demonstrating its promising application in portable micro-/nanoscale energy storage devices.