Tailoring Hybrid Nanostructures of MXene and Molybdenum Diselenide for High Performance Asymmetric Supercapacitor Applications

Tailoring the innovative hybrid composite electrode with outstanding physical and chemical properties is essential for energy storage applications. Significantly, highly conductive thin layers combined with the active sites of metal selenide in the hybrid structure, increase the active area and porosity to increases the surface area and porosity to increase the insertion/extraction of electrolyte ions. Here, a V 2 C MXene‐MoSe 2 hybrid electrode is engineered by integrating V 2 CT x MXene nanosheets into a 3D MoSe 2 nanosphere framework, developing a highly interconnected 2D/3D heterostructure with unique charge–transfer routes, redox‐active site density, and ion‐accessible surface area. This rational structural‐engineering approach creates efficient interfacial interactions, which promote effective charge storage capabilities. The V 2 C MXene‐MoSe 2 electrode exhibits a high specific capacitance of 792 F g −1 at 1 A g −1 , which outperforms significantly better than the pristine V 2 CT x MXene and MoSe 2 electrodes. The V 2 C MXene‐MoSe 2 hybrid electrode when employed as the positive electrode in an asymmetric supercapacitor (SC), it achieves an energy density of 33.6 Wh kg −1 at a power density of 706 W kg −1 . It also preserves 94.1% capacitance retention after 10,000 cycles at 3 A g −1 . These findings show that rational interfacial coupling of MXenes with transition‐metal dichalcogenides offers a diverse platform for next‐generation SCs able to efficiently bridge the performance gap between batteries and electrochemical capacitors.