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A nanocomposite of molybdenum trioxide (α-MoO3) nanobelts coated with polypyrrole has been fabricated by a simple in situ polymerization route.The structure, morphology and electrochemical performance of the nanocomposite were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical measurements.