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

• Published in: Electrochimica acta 2018-02, Vol.263, p.409-416
• Main Authors: Gong, Hanqin, Zheng, Feng, Xu, Jiahe, Sun, Chencen, Gao, Liangchao, Hu, Pengfei, Li, Yang, Gong, Yu, Zhen, Qiang, Bashir, Sajid
• Format: Article
• Language: English
• Subjects: Array; Arrays; Capacitance; Charge transfer; Composite materials; Copper; Electric properties; Electrochemical impedance spectroscopy; Electrode materials; Electrodes; Heterojunction; Heterojunctions; Microscopes; Molybdenum; Molybdenum disulfide; Nanomaterials; Nanorods; Scanning electron microscopy; Substrates; Supercapacitor; Synergistic effect; Tungsten oxides; Tungsten trioxide; X ray photoelectron spectroscopy; X-ray diffraction
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2018.01.072

We first report a composite of molybdenum disulfide (MoS2) nanoflake arrays (MNFs) and tungsten trioxide (WO3) 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 MoS2 and WO3, which can be a better candidate for supercapacitive electrode material. [Display omitted] •MoS2 nanoflake arrays (MNFs) is prepared directly on a Cu foil.•WO3 nanoflake arrays (WNRs) is prepared on MNFs to form a heterojunction.•The MNFs-WNRs could be used as a binder-free supercapacitive electrode material.•The MNFs-WNRs exhibits a high specific capacitance of 522 F g−1 at 0.5 A g−1.•The high capacitance of MNFs-WNRs is ascribed to the synergistic effect.