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Micron rods of hexagonal MoO3 (h-MoO3) and nanobelts of orthorhombic MoO3 (α-MoO3) were prepared using a facile hydrothermal synthesis. The factors that influenced the morphologies, crystalline structures and electrochemical properties of the MoO3 were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental revealed that both the reaction time and acidity coefficient played important roles in controlling the crystalline structure and morphology of the MoO3; however, the acidity coefficient was the crucial factor. At lower acidity coefficient, the growth of the MoO3 nucleus only resulted in wellcrystallized h-MoO3 rods as the reaction time increased. As the acidity coefficient increased, the hMoO3 phase was transformed into an α-MoO3 phase and the morphology changed gradually from three-dimensional hexagonal micron rods to low-dimension nanobelts. As the anode electrode, the αMoO3 nanobelts exhibited better electrochemical properties. The initial specific capacities of 223.1 mAh•gand a wide discharge plateau of 2.2V for the α-MoO3 were obtained. On the other hand a stable electrochemical performance was achieved for h-MoO3 micron rods.

Nano MoO3 Phase Structural Evolution During Hydrothermal Synthesis and Its Electrochemical Properties