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dc.contributor.authorXiao, Weien
dc.contributor.authorWang, Delien
dc.contributor.authorLou, David Xiong Wenen
dc.identifier.citationXiao, 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.en
dc.description.abstractIn 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.en
dc.relation.ispartofseriesThe journal of physical chemistry Cen
dc.rights© 2009 American Chemical Society.en
dc.subjectDRNTU::Science::Medicine::Biomedical engineeringen
dc.titleShape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reductionen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen
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