Preparation and supercapacitive property of molybdenum disulfide (MoS2) nanoflake arrays- tungsten trioxide (WO3) nanorod arrays composite heterojunction: A synergistic effect of one-dimensional and two-dimensional nanomaterials

We first report a composite of molybdenum disulfide (MoS 2 ) nanoflake arrays (MNFs) and tungsten trioxide (WO 3 ) nanorod arrays (WNRs) directly grown on a copper (Cu) substrate. This composite is characterized in detail by scanning and transmission electron microscopes (SEM/TEM), X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS). All of the evidences indicate that the obtained composite is a heterojunction. The supercapacitive properties of MNFs-WNRs composite heterojunction are measured systematically by using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. The heterojunction exhibits a high specific capacitance of 522 F g −1 at 0.5 A g −1 , a high capacitance retention (95%) after 5000 cycles and a low charge transfer resistance (1.0 Ω). And this kind of heterojunction has advantages of both MoS 2 and WO 3 , which can be a better candidate for supercapacitive electrode material .