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a-MoO 3 nanobelts were successfully prepared by a facile hydrothermal method with sodium molybdate (Na 2 MoO 4 ) as the Mo source and NaCl as the capping agent. The as-prepared products were characterized using Fourier transformation infrared spectrophotometry (FT-IR), X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and selected area electronic diffraction (SAED) and their pseudocapacitive properties were investigated in a 0.5 M aqueous Li 2 SO 4 solution by cyclic voltammetry (CV), chronopotentiometry (CP) and AC impendence. The results show that the dimensions of the as-prepared a-MoO 3 nanobelts are 200-400 nm in width, ca. 60 nm in thickness and 3-8 mm in length. The redox potential for the a-MoO 3 nanobelts is found in the range of À0.3 to À1.0 V vs. SCE, which indicates that the a-MoO 3 nanobelts can be used as anode electrode materials for hybrid supercapacitors. The specific capacitances of the a-MoO 3 nanobelts at 0.1, 0.25, 0.5 and 1 A g À1 are 369, 326, 256 and 207 F g À1 , respectively. The maximum specific capacitance of the a-MoO 3 nanobelts is much higher than those of MoO 3 nanoplates with 280 F g À1 , MoO 3 nanowires with 110 F g À1 and MoO 3 nanorods with 30 F g À1 recently reported in literature. Furthermore, the a-MoO 3 nanobelt electrode exhibits a good cycle stability with more than 95% of the initial specific capacitance maintained after 500 cycles. Additionally, the present route to prepare nanostructured MoO 3 is much less expensive than those with Mo powders as the Mo source. Overall, the obtained high performance a-MoO 3 nanobelts could be a promising electrode material for supercapacitors.

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