Hexagonal MoS2 nanoflake arrays (h-MNFs) have been synthesized directly via hydrothermal route with Cu foil as substrate, (NH4)(6)Mo7O24 center dot 4H(2)O as the molybdenum source, CN2H4S as the sulfur source and reductant, and (CH3)(2)CHOH as the dispersant. The micro morphology and crystallinity of MNFs are analyzed by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), Xray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman microscopy (RM). The morphological change and growth process of MNFs are investigated, basing on the samples at different hydrothermal reaction times. Moreover, the supercapacitive properties of MNFs have been examined. It is found that MNFs has a good cycling invertibility (93%) and stability (90%) after 5000 cycles, a relatively high specific capacitance (420 Fg(-1)), a low charge transport resistance (1.8 Omega) and available energy densities ranging from 21 to 17 W h kg(-1) with corresponding practical power densities ranging from 150 to 3000W kg(-1). (C) 2017 Elsevier Ltd. All rights reserved.