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Synergistic effects in 3D honeycomb-like hematite nanoflakes/branched polypyrrole nanoleaves heterostructures as high-performance negative electrodes for asymmetric supercapacitors

AuthorsTang, Peng-Yi ; Han, Li-Juan; Genç, Aziz ; Galán-Mascarós, José Ramón; Morante, Joan Ramon; Arbiol, Jordi
Negative electrode
Synergistic effects
Issue Date2016
CitationNano Energy 22: 189-201 (2016)
AbstractRational assembly of unique branched heterostructures is one of the facile techniques to improve the electrochemical figure of merit of materials. By taking advantages of hydrogen bubbles dynamic template, hydrothermal method and electrochemical polymerization, branched polypyrrole (PPy) nanoleaves decorated honeycomb-like hematite nanoflakes (core-branch FeO@PPy) are fabricated. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and scanning transmission electron microscopy in high angle annular dark field mode with electron energy loss spectroscopy were combined to elucidate the mechanisms underlying formation and morphogenesis evolution of core-branch FeO@PPy heterostructures. Benefiting from the stability of honeycomb-like hematite nanoflakes and the high conductivity of PPy nanoleaves, the resultant core-branch FeO@PPy exhibits an ultrahigh capacitance of 1167.8 F g at 1 A g in 0.5 M NaSO aqueous solution. Moreover, the assembled bi-metal oxides asymmetric supercapacitor (FeO@PPy//MnO) gives rise to a maximum energy density of 42.4 W h kg and a maximum power density of 19.14 kW kg with an excellent cycling performance of 97.1% retention after 3000 cycles at 3 A g. These performance features are superior than previous reported iron oxide/hydroxides based supercapacitors, offering an important guideline for future design of advanced next-generation supercapacitors.
Descriptionet al.
Identifiersdoi: 10.1016/j.nanoen.2016.02.019
issn: 2211-2855
Appears in Collections:(CIN2) Artículos
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