Perpustakaan Digital ITB

The inductive effect related to foreign metal substitution hasgreat effect on the redox behavior of transition metal oxides, which plays animportant role in their electrochemical activities. In this work, we demonstratethe inductive effect in nickel oxide nanosheet arrays (NSAs) via doping withthe lower electronegative element Mn, which has greatly improved theirelectrochemical capacitance and stability. Density functional theory (DFT)calculations show that the inductive effect in Mn?NiO increases the electrontransport efficiency, enhances the adsorption energy of OH?, and also makesthe compound more covalent. Therefore, Mn?NiO NSAs demonstrated adramatically improved specific capacitance twofold better than that of pureNiO NSAs at a current density of 5 mA cm?2and higher stability without anydecay of capacitance after 10 000 cycles at 30 mA cm?2. Moreover, the hybridsupercapacitor device of Mn?NiO NSAs//graphene?CNT exhibited anexcellent recycling stability after 50 000 cycles of charging/discharging at 6 A g?1with comparative energy density and powerdensity