Enhancement in Electrochemical Performance of New Mg‐Doped MoSe ₂ Nanostructured Material

Pristine molybdenum diselenide (MoSe 2 ) and magnesium‐doped MoSe 2 (MoSe 2 @Mg) nanostructures were synthesized via a facile and scalable hydrothermal method. Magnesium was selected as a dopant due to its earth abundance, lightweight nature, and relatively unexplored incorporation into MoSe 2 , where it effectively modulates the electronic structure and surface reactivity, promoting enhanced charge transfer and improved electrochemical performance. The synthesized materials were systematically evaluated for their structural, optical, and electrochemical properties. The UV–visible spectroscopy showed band gap widening from 1.578 (MoSe 2 ) to 1.866 eV (MoSe 2 @Mg), confirming electronic structure modification after Mg incorporation. X‐ray diffraction (XRD) analysis verified preservation of the hexagonal phase with slight peak shifts and reduced crystallite size, indicating lattice distortion. High resolution scanning electron microscopic (HR‐SEM) revealed nanosheet morphologies for both samples, with a more compact structure in MoSe 2 @Mg. Mg incorporation was further confirmed by EDX mapping, transmission electron microscopy (TEM), and SAED, which indicated clear lattice fringes with increased local disorder in the doped sample. Electrochemical evaluation using CV and EIS analyses demonstrated enhanced redox activity, higher current density, and reduced charge‐transfer resistance in MoSe 2 @Mg, confirming improved electrochemical kinetics after Mg incorporation. Overall, Mg doping in the nanostructured material provides an effective way to enhance the electrochemical performance of MoSe 2 for energy‐related applications.