3D Mesoporous Ni(OH)2/WS2 Nanofibers with Highly Enhanced Performances for Hybrid Supercapacitors

3D Ni(OH)(2)/tungsten disulfide (WS2) nanofibers composed of ultrathin nanoflakes are synthesized by electrospinning followed by a hydrothermal process, which have a large specific surface of 64.56 m(2) g(-1). When tested in a three-electrode configuration, the WS2/Ni(OH)(2) nanofiber-based electrode exhibits a high specific capacity of 354 C g(-1) at a current density of 1 A g(-1). The hybrid storage device, in which WS2/Ni(OH)(2) nanofibers and graphene are used as the positive and negative electrodes, respectively, exhibits a high energy density of 34 Wh kg(-1) at a power density of 940 W kg(-1) and a high capacity retention of 83% after 4000 cycles at 4 A g(-1). The as-synthesized 3D Ni(OH)(2)/WS2 nanofibers provide a way for the WS2 nanostructure to optimize its viability and potential in constructing a high-performance energy storage device.