MoS2 reinforced high–entropy sulfide heterostructures for high–performance supercapacitors

High–entropy sulfide (HES) benefits from multicomponent synergy and improved structural stability, single HES electrodes may still suffer from limited exposure of surface redox–active sites, insufficient electrochemically active interfaces, and restricted ion diffusion pathways. Here, a HES@MoS 2 heterojunction electrode material based on HES as the core was synthesized using a two–step hydrothermal method. The S/Mo source ratio was varied to regulate MoS 2 shell growth and mesoporous architecture. The combination of HES/MoS 2 heterointerface construction with MoS 2 nanosheet the electrochemically active interface and enhances energy storage density. The optimized sample (HES@MoS 2 –2), which was synthesized at an S/Mo source ratio of 4, exhibits excellent electrochemical performance, including good rate capability, fast reaction kinetics, low impedance, and a high specific capacitance of 1622.2 F g –1 at 0.5 A g –1 . Density functional theory (DFT) further suggests interfacial electronic coupling involving Mo d, transition–metal d, and S p states. The asymmetric supercapacitor device assembled from the material and carbon ball has an energy density of 132.1 Wh kg –1 at a power density of 375.6 W kg –1 and retains 88.1% of its initial capacitance after 10,000 cycles. This study combines HES/MoS 2 interface construction with regulation of the nanosheet shell to improve electrolyte accessibility and electrochemical performance of HES–based electrodes. Download: Download high-res image (297KB) Download: Download full-size image