Hierarchical MoSe ₂ /ZnSe/ZnO nanoarchitectures for enhanced energy storage applications

Molybdenum diselenide (MoSe2) has attracted considerable attention for potential sustainable energy storage because of its layered structure, high surface area, and favourable electrochemical properties. However, agglomeration, low intrinsic conductivity and cyclic instability limit its performance during fast charge–discharge cycles. This investigation reports the synthesis of a mixed metal composite (MMC), where in situ transformation of ZnO nanoparticles into ZnSe occurs in presence of MoSe2 precursors, resulting in the formation of a MoSe2/ZnSe/ZnO MMC. Structural and morphological analyses involved XRD, XPS, and FESEM which confirmed the successful formation of the composite and confirms the presence of each component. Electrochemical performance was evaluated using cyclic voltammetry (CV), and galvanostatic charge–discharge measurements. The optimized MMC exhibited exceptionally high specific capacitance of 460.4 F g−1 at a current density of 5 A g−1 and excellent stability over 5000 charge–discharge cycles. This demonstrates the enhanced supercapacitive performance of MMC compared with the individual components and promising potential for energy storage applications.