A nanocrystalline structured NiO/MnO₂@nitrogen-doped graphene oxide hybrid nanocomposite for high performance supercapacitors

Abstract

A nanocrystalline NiO@MnO2/NGO hybrid composite electrode showed specific capacitance of 1490 Fg−1 at a current density of 0.5 Ag−1 and retains 98% up to 2000 cycles indicating its good cyclic stability.

Supercapacitive Performance of N-Doped Graphene/Mn3O4/Fe3O4 as an Electrode Material

“…NDG/Mn3O4/Fe3O4 exhibits the highest Csp (90.58 F/g), followed by NDG/Mn3O4 (83.21 F/g) and NDG/Fe3O4 (14.27 F/g). NDG/Mn3O4/Fe3O4 also shows the longest discharge time, as compared to NDG/Mn3O4 and NDG/Fe3O4 at 0.5 A/g (Figure 6a), indicating that NDG/Mn3O4/Fe3O4 possesses the highest charge storage capacity [8,21]. The discharging time of NDG/Mn3O4/Fe3O4 becomes shorter as current density increases from 0.5 A/g to 2.5 A/g (Figure 6b), indicating the decrease of Csp from 90.58 F/g to 73.10 F/g.…”

“…where C sp is the specific capacitance of the electrode (F/g), ∆t is the discharging time (s), I is the discharge current (A/g), ∆V is the potential range (V), and m is the mass of the electrode material (g (Figure 6a), indicating that NDG/Mn 3 O 4 /Fe 3 O 4 possesses the highest charge storage capacity [8,21]. The discharging time of NDG/Mn 3 O 4 /Fe 3 O 4 becomes shorter as current density increases from 0.5 A/g to 2.5 A/g (Figure 6b), indicating the decrease of C sp from 90.58 F/g to 73.10 F/g.…”

“…The nanocomposite has a capacity retention of 93% after 6000 cycles. Ramesh, et al [8] reported that NDG/NiO/MnO 2 nanocomposites can achieve a high specific capacitance of 1490 F/g with 98% cyclic stability retention after 2000 cycles.…”

Trimetallic Oxides/GO Composites Optimized with Carbon Ions Radiations for Supercapacitive Electrodes

“…Graphene oxide is among the deeply researched components for compositing metal oxides [36][37][38], with an improved capacitance and cyclic stability. Ramesh et al [39] modified the electrochemical properties of a pure NiO/MnO 2 with that of NiO/MnO 2 @nitrogen-doped graphene oxide hybrid with a specific capacitance of (266.7 to 1490) F/g at a current density of 0.5 A/g). The obtained core/shell nanocomposites displayed excellent stability with 81.7% retention capacity and proved to be a promising material for supercapacitor applications [40].…”

Recent Advances in Metal Chalcogenides (MX; X = S, Se) Nanostructures for Electrochemical Supercapacitor Applications: A Brief Review

“…A substantial global upsurge in the depletion of fossil fuels from the rapid growth of global economy has generated two vital concerns: the first is the exhaustion of existing fossil fuel reserves, and the second is associated with an increase in greenhouse gas emissions, in particular, and environmental pollution, in general. Hence, it is necessary to develop and commercialize sustainable environment friendly energy sources and their related technologies are being developed globally as a matter of urgency [ 1 , 2 , 3 , 4 , 5 , 6 ]. Also, the development of associated energy conversion devices to gather these intermittent energy sources efficiently is in demand.…”