Silicon Carbide-Doped Strontium Sulfide-Iron Sulfide Heterostructures as High-Performance Electrodes for Hybrid Supercapacitor and Electrocatalysis

초록

In this study, silicon carbide-doped strontium sulfide-iron sulfide heterostructures were fabricated via a hydrothermal process. Structural and morphological analyses by XRD and SEM confirmed a highly crystalline structure with uniform microcrystalline morphology. The electrochemical properties of the synthesized silicon carbide-doped strontium sulfide-iron sulfide heterostructures are investigated in a three-electrode arrangement using 1 M potassium hydroxide as the electrolyte. The electrode exhibited an outstanding specific capacity (Qs) of 2199.64 C g-1 along with remarkable retaining 80% of its initial capacity. In addition, the heterostructures electrode exhibited an extraordinary coulombic efficiency of 94%. The SrS@FeS@SiC heterostructures electrode with activated carbon (AC) revealed an incredible Qs of 197.84 C g-1, accompanied by a high energy density of 90 Wh kg-1 and a power density of 2400 W kg-1. The boosted performance of SrS@FeS@SiC heterostructures is attributed to the synergistic effect of SiC incorporation, which improves electrical conductivity, facilitates rapid ion transport, and strengthens the interaction between the electrodes and electrolyte, thus accelerating Faradaic charge-storage processes. Furthermore, the composite demonstrated promising electrocatalytic activity toward the hydrogen evolution reaction (HER), delivering a low overpotential of 67 mV and a Tafel slope of 75 mV dec-1 while exhibiting good operational stability. These results demonstrate that the SiC-modified SrS@FeS nanocomposite is a highly incredible and multifunctional electrode for next-generation energy related technologies. A silicon carbide doped sulfide material was made by a hydrothermal method.The electrode shows high charge storage with 94% efficiency.The device delivers 90 Wh kg-1 energy density and 2400 W kg-1 power density.It retains 80% of its capacity after 1000 charge cycles.The structure improves ion movement and supports fast charge reactions.

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