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Title: Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors
Authors: Lou, David Xiong Wen
Wang, Hsin-Yi
Xiao, Fang-Xing
Yu, Le
Liu, Bin
Keywords: DRNTU::Engineering::Materials::Nanostructured materials
Issue Date: 2014
Source: Wang, H.-Y., Xiao, F.-X., Yu, L., Liu, B., & Lou, D. X. W. (2014). Hierarchical α-MnO 2 Nanowires@Ni1-xMnxOy Nanoflakes Core-Shell Nanostructures for Supercapacitors. Small, 10(15), 3181-3186.
Series/Report no.: Small
Abstract: A facile two-step solution-phase method has been developed for the preparation of hierarchical α-MnO2 nanowires@Ni1-xMnxOy nanoflakes core–shell nanostructures. Ultralong α-MnO2 nanowires were synthesized by a hydrothermal method in the first step. Subsequently, Ni1-xMnxOy nanoflakes were grown on α-MnO2 nanowires to form core–shell nanostructures using chemical bath deposition followed by thermal annealing. Both solution-phase methods can be easily scaled up for mass production. We have evaluated their application in supercapacitors. The ultralong one-dimensional (1D) α-MnO2 nanowires in hierarchical core–shell nanostructures offer a stable and efficient backbone for charge transport; while the two-dimensional (2D) Ni1-xMnxOy nanoflakes on α-MnO2 nanowires provide high accessible surface to ions in the electrolyte. These beneficial features enable the electrode with high capacitance and reliable stability. The capacitance of the core–shell α-MnO2@Ni1-xMnxOy nanostructures (x = 0.75) is as high as 657 F g−1 at a current density of 250 mA g−1, and stable charging-discharging cycling over 1000 times at a current density of 2000 mA g−1 has been realized.
ISSN: 1613-6810
DOI: 10.1002/smll.201303836
Rights: © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles

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