Mechanism analysis of the capacitance contributions and ultralong cycling-stability of the isomorphous MnO₂@MnO₂ core/shell nanostructures for supercapacitors

Abstract

The isomorphous MnO2@MnO2 core/shell nanostructures synthesized through a facile hydrothermal process showed remarkable electrochemical performance, i.e., a high specific capacitance with excellent cycling stability.

A facile one-step approach to hierarchically assembled core–shell-like MnO2@MnO2 nanoarchitectures on carbon fibers: An efficient and flexible electrode material to enhance energy storage

“…Such enhanced energy storage of the hierarchical electrode material was attributed to the following aspects: The large surface area provided by the MnO 2 NSAs on MnO 2 HNPAs increased the surface wettability of the electrode with the electrolyte solution, very few MnO 2 NSAs on MnO 2 HNPAs were dissolved during cycling, and inner MnO 2 NSAs underwent further activation. This enhancement in energy storage properties on cycling has been observed previously in binder-free electrode materials [43,[58][59][60][61]. After cycling tests, the XPS spectrum of the corresponding sample clearly showed the presence of Mn and O without any impurities (inset of Fig.…”

“…Thereby, the material can more easily participate in reversible redox reactions with the electrolyte solution, facilitating fast electrochemical kinetics during charging and discharging [39]. Many 3D and core-shell-like morphologies of MnO [43]. However, these methods are based on template/surfactant-assisted chemical synthesis, which entails complicated growth steps.…”

NiCo2O4 / MnO2 heterostructured nanosheet: influence of preparation conditions on its electrochemical properties

“…For example, the A@B structure: NiCo2O4@MnO2 [9,19,20], ZnCo2O4@MnO2 [21], CuCo2O4@MnO2 [22],Co3O4@MnO2 [10,23,24], NiCo2S4@MnO2, [25,26], ZnO2@MnO2 [17], Fe2O3@MnO2 [27], MnO2@MnO2 [28], TiO2@MnO2 [29,30], CuO@MnO2 [31],Co3O4@Au@MnO2 [32], Co3O4@Pt@MnO2 [33], WO3-x@Au@MnO2 [34], MnO2/Mn/MnO2 [35]; the A/B structure: NiCo2O4/MnO2 [36,37], Ni(OH)2/MnO2 [8,13], NiCo2S4/MnO2 [38],…”

In-situ synthesize of graphene-Mn3O4 nanocomposites for high-rate pseduocapacitive electrodes

“…Metal oxide electrodes have been paid more and more attention because the rapid reversible redox reaction can penetrate into the electrode while the energy can be stored in the three-dimensional space to improve the energy density [8][9][10]. At present, the promising metal oxide electrode materials are mainly MnOx (x =1, 2, 3/2, 4/3) [11][12][13][14][15], NiO [16], Co3O4 [17], V2O5 [18] and RuO2 [19].…”