High energy density performance of hydrothermally produced hydrous ruthenium oxide/multiwalled carbon nanotubes composite: Design of an asymmetric supercapacitor with excellent cycle life

138h-RuO2/MWCNTs nanocomposite synthesized by hydrothermal process, exhibited a good electrochemical performance in 1 M H2SO4 in single- and two-electrode system. The fabricated device performed 20,000 cycles with 88% capacitance retention at 25 A/g.