Improved electrochemical performance of defect-induced supercapacitor electrodes based on MnS-incorporated MnO nanorods.

In this paper, we report the effect of MnS nanoparticles on the electrochemical performance of 1D-MnO stable nanorods for supercapacitor electrodes. The MnS-incorporated 1D-MnO (MnO/MnS) nanorods were produced using a facile two-step hydrothermal method. Morphological investigation reveals that the incorporation of MnS nanoparticles distorts the lattice fringes and extends the interlayer spacing of the MnO nanorods. The structural study showed that MnS modified the structural parameters of the nanocomposite. XPS analysis revealed defects in the nanocomposite due to the generation of oxygen vacancies. The MnO/MnS nanocomposite improves capacitive performance and has the highest specific capacitance of 305 F g, at a current density of 1 A g with an energy density of 5.7 W h kg and a power density of 449 W kg. The MnO/MnS nanocomposite electrodes exhibit exceptional cyclic stability after 5000 charging and discharging cycles. With enhanced specific capacitance and excellent cyclic stability, the MnO/MnS nanocomposite paves a new way to produce supercapacitor electrodes.