Facile hydrothermal synthesis of zinc sulfide nanowires for high-performance asymmetric supercapacitor
Muhammad Rauf, Syed Shaheen Shah, Said Karim Shah, Syed Niaz Ali Shah, Tauseef Ul Haq, Jamal Shah, Aziz Ullah, Tauqir Ahmad, Yaqoob Khan, Md. Abdul Aziz, Khizar Hayat
Abstract
A facile, single-step hydrothermal route is followed to prepare ZnS nanowires with large aspect ratios. The obtained ZnS nanowires deposited on nickel foam (ZnS/Ni-foam) exhibit a specific capacitance of 781 F/g at a current density of 0.5 A/g. An asymmetric supercapacitor fabricated from ZnS/Ni-foam as a positive electrode and jute derived activated carbon coated on Ni-foam (JAC/Ni-foam) as a negative electrode attains a high specific capacitance of 573 F/g at a current density of 0.5 A/g, with an accompanying high energy density of 51 Wh/kg at a power density of 200 W/kg in an extensive operating potential window of 1.2 V. In addition, the ZnS//JAC asymmetric supercapacitor reveals long-term cyclic stability, after 10,000 GCD cycles the device sustain around ∼87 % of the initial specific capacitance. These results shed enlighten a new opportunity for promising electrode materials in supercapacitors.