Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction
In this work, three types of MnO2 nanostructures, viz., microsphere/nanosheet core−corona hierarchical architectures, one-dimensional (1D) nanorods, and nanotubes, have been synthesized employing a simple hydrothermal process. The formation mechanisms have been rationalized. The materials have been...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2012
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| Online Access: | https://hdl.handle.net/10356/95591 http://hdl.handle.net/10220/8311 |
| _version_ | 1826120687527395328 |
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| author | Xiao, Wei Wang, Deli Lou, David Xiong Wen |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Xiao, Wei Wang, Deli Lou, David Xiong Wen |
| author_sort | Xiao, Wei |
| collection | NTU |
| description | In this work, three types of MnO2 nanostructures, viz., microsphere/nanosheet core−corona hierarchical architectures, one-dimensional (1D) nanorods, and nanotubes, have been synthesized employing a simple hydrothermal process. The formation mechanisms have been rationalized. The materials have been thoroughly characterized by X-ray diffraction, Brunauer−Emmett−Teller spectrometry, field-emission scanning electron miscroscopy, energy dispersive spectroscopy, and transmission electron microscopy. The microsphere/nanosheet core−corona hierarchical structures are found to be the layered birnessite-type MnO2, while 1D nanorods and nanotubes are of the α-MnO2 phase. These MnO2 nanostructures are used as a model system for studying the shape/phase-dependent electrocatalytic properties for the oxygen reduction reaction, which have be investigated by cyclic and linear sweep voltammetry. It is found that α-MnO2 nanorods/tubes possess largely enhanced electrocatalytic activity compared to birnessite-type MnO2 core−corona spheres despite the latter having a much higher specific surface area. The vast difference in electrocatalytic activity is discussed in terms of crystal structure, oxygen adsorption mode, and exposed crystal facets. |
| first_indexed | 2024-10-01T05:20:31Z |
| format | Journal Article |
| id | ntu-10356/95591 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:20:31Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/955912020-03-07T11:35:34Z Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction Xiao, Wei Wang, Deli Lou, David Xiong Wen School of Chemical and Biomedical Engineering DRNTU::Science::Medicine::Biomedical engineering In this work, three types of MnO2 nanostructures, viz., microsphere/nanosheet core−corona hierarchical architectures, one-dimensional (1D) nanorods, and nanotubes, have been synthesized employing a simple hydrothermal process. The formation mechanisms have been rationalized. The materials have been thoroughly characterized by X-ray diffraction, Brunauer−Emmett−Teller spectrometry, field-emission scanning electron miscroscopy, energy dispersive spectroscopy, and transmission electron microscopy. The microsphere/nanosheet core−corona hierarchical structures are found to be the layered birnessite-type MnO2, while 1D nanorods and nanotubes are of the α-MnO2 phase. These MnO2 nanostructures are used as a model system for studying the shape/phase-dependent electrocatalytic properties for the oxygen reduction reaction, which have be investigated by cyclic and linear sweep voltammetry. It is found that α-MnO2 nanorods/tubes possess largely enhanced electrocatalytic activity compared to birnessite-type MnO2 core−corona spheres despite the latter having a much higher specific surface area. The vast difference in electrocatalytic activity is discussed in terms of crystal structure, oxygen adsorption mode, and exposed crystal facets. 2012-07-12T00:55:06Z 2019-12-06T19:17:57Z 2012-07-12T00:55:06Z 2019-12-06T19:17:57Z 2010 2010 Journal Article Xiao, W., Wang, D., & Lou, D. X. W. (2010). Shape-Controlled Synthesis of MnO2 Nanostructures with Enhanced Electrocatalytic Activity for Oxygen Reduction. The Journal of Physical Chemistry C, 114(3), 1694-1700. https://hdl.handle.net/10356/95591 http://hdl.handle.net/10220/8311 10.1021/jp909386d en The journal of physical chemistry C © 2009 American Chemical Society. |
| spellingShingle | DRNTU::Science::Medicine::Biomedical engineering Xiao, Wei Wang, Deli Lou, David Xiong Wen Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction |
| title | Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction |
| title_full | Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction |
| title_fullStr | Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction |
| title_full_unstemmed | Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction |
| title_short | Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction |
| title_sort | shape controlled synthesis of mno2 nanostructures with enhanced electrocatalytic activity for oxygen reduction |
| topic | DRNTU::Science::Medicine::Biomedical engineering |
| url | https://hdl.handle.net/10356/95591 http://hdl.handle.net/10220/8311 |
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