Effect of tungsten disulfide on NiCo-MOFs@NiVS nanocomposite binder-free electrode material for hybrid supercapacitor

Abstract

This investigation addresses the novel combination of MOFs with TMDs and metal vanadium sulfides, offering a unique approach for fabricating high-performance hybrid electrode materials. Here, we proposed a composite NiCo-MOF@WS₂@NiVS material, which was synthesized by the hydrothermal method. Further, the tip sonication method was used to fabricate WS₂ nanoflake. Moreover, a comprehensive study was conducted to observe the distinctive behavior of binder-free electrodes. A broad investigation of the morphological, structural, and compositional characteristics of nanocomposite was conducted utilizing SEM, XRD, and XPS methodologies. The NiCo-MOFs@WS₂@NiVS electrode exhibited a specific capacity (Qs) of 1235 Cg⁻¹, which was higher than the NiCo-MOF (567 Cg⁻¹) and WS₂ (717 Cg⁻1). When employed in supercapattery, the NiCo-MOF@WS₂@NiVS hybrid electrode showed a Qs of 600 Cg⁻¹. The device demonstrated a noteworthy P_d of 2500 Wkg⁻¹ and a remarkable E_d of 133 Whkg⁻¹. After 5000 cycles, the device has retained 88% of its initial capacity. These results indicate that the NiCo-MOF@WS₂@NiVS nanocomposite can be efficiently employed in storage devices, improving energy solutions' effectiveness and sustainability.