Feasibility of synthesizing MgMn2O4 nanostructures/nanocomposites by examining three different methods and studying their properties for electrochemical hydrogen sorption

Abstract

MgMn2O4/Mg2MnO4 composite electrode materials were synthesized through a sol-gel route in the presence of saccharides, with different precursor sources employed to tailor the final products. The choice of starting ma terials significantly influenced the phase purity, crystal structure, and microstrain of the synthesized samples. The impact of these parameters on the morphology, optical properties, and electrochemical performance was systematically examined. In parallel, magnesium manganite was also synthesized using hydrothermal and co- precipitation methods. Surfactant-free hydrothermal synthesis enabled the formation of MgMn2O4 nano structures, and the effects of reaction temperature and time were evaluated. Among the sol-gel-prepared samples, the best electrochemical performances were achieved for the samples synthesized using sucrose and glucose fuels, delivering maximum specific capacities of 279 mAhg 1 and 374 mAhg⁻¹ , respectively. These findings demonstrate that MgMn2O4/Mg2MnO4 materials are promising candidates for energy storage applications.