Layered double hydroxides and metal–organic frameworks aided preparation of polymetallic sulfide electrode for efficient supercapacitor

Polymetal sulfides are regarded as highly promising electrode materials for supercapacitors (SCs), owing to their high stability, relatively short electron transport pathways, enhanced electronic conductivity, and favorable electrochemical properties. Notably, polymetal sulfides derived from layered double hydroxide (LDH) templates exhibit significantly improved specific capacitance and cycling stability compared to those synthesized without LDH precursors. Moreover, the introduction of metal–organic frameworks (MOFs) onto the surface of polymetal sulfides enables the construction of three-dimensional (3D) porous architectures, which provide more efficient ion and electron transport pathways. In this study, a CoMnMo-LDH@S@NiMOF (CMM-LDH@S@NiMOF) electrode featuring a 3D layered porous structure was fabricated on nickel foam via a multi-step hydrothermal method. The as-prepared electrode demonstrated outstanding electrochemical performance, delivering a specific capacitance of 1158.4 F·g −1 at 1 A·g −1 , excellent conductivity, and a capacitance retention of 79.59% after 4000 cycles at 5 A·g −1 . These enhanced properties are attributed to the unique 3D architecture, favorable electrochemical characteristics, and synergistic effects among the multiple metal species. Furthermore, an asymmetric supercapacitor (ASC) device was assembled using the CMM-LDH@S@NiMOF electrode as the positive electrode and activated carbon (AC) as the negative electrode. The CMM-LDH@S@NiMOF//AC ASC delivered a high energy density of 18 Wh·kg −1 at a power density of 800.01 W·kg −1 and retained 64.81% of its initial capacitance after 5000 cycles, further demonstrating the practical potential of the designed electrode material.