Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors
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...
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| Format: | Journal Article |
| Language: | English |
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2014
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| Online Access: | https://hdl.handle.net/10356/105234 http://hdl.handle.net/10220/20514 http://dx.doi.org/10.1002/smll.201303836 |
| _version_ | 1826110966495969280 |
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| author | Lou, David Xiong Wen Wang, Hsin-Yi Xiao, Fang-Xing Yu, Le Liu, Bin |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Lou, David Xiong Wen Wang, Hsin-Yi Xiao, Fang-Xing Yu, Le Liu, Bin |
| author_sort | Lou, David Xiong Wen |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T02:43:12Z |
| format | Journal Article |
| id | ntu-10356/105234 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:43:12Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/1052342019-12-06T21:47:47Z Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors Lou, David Xiong Wen Wang, Hsin-Yi Xiao, Fang-Xing Yu, Le Liu, Bin School of Chemical and Biomedical Engineering DRNTU::Engineering::Materials::Nanostructured materials 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. 2014-09-11T08:22:27Z 2019-12-06T21:47:47Z 2014-09-11T08:22:27Z 2019-12-06T21:47:47Z 2014 2014 Journal Article 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. 1613-6810 https://hdl.handle.net/10356/105234 http://hdl.handle.net/10220/20514 http://dx.doi.org/10.1002/smll.201303836 en Small © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| spellingShingle | DRNTU::Engineering::Materials::Nanostructured materials Lou, David Xiong Wen Wang, Hsin-Yi Xiao, Fang-Xing Yu, Le Liu, Bin Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors |
| title | Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors |
| title_full | Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors |
| title_fullStr | Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors |
| title_full_unstemmed | Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors |
| title_short | Hierarchical α-MnO 2 nanowires@Ni1-xMnxOy nanoflakes core-shell nanostructures for supercapacitors |
| title_sort | hierarchical α mno 2 nanowires ni1 xmnxoy nanoflakes core shell nanostructures for supercapacitors |
| topic | DRNTU::Engineering::Materials::Nanostructured materials |
| url | https://hdl.handle.net/10356/105234 http://hdl.handle.net/10220/20514 http://dx.doi.org/10.1002/smll.201303836 |
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