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Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction.

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Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction.

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dc.contributor.author Xiao, Wei.
dc.contributor.author Wang, Deli.
dc.contributor.author Lou, David Xiong Wen.
dc.date.accessioned 2012-07-12T00:55:06Z
dc.date.available 2012-07-12T00:55:06Z
dc.date.copyright 2010
dc.date.issued 2012-07-12
dc.identifier.citation 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.
dc.identifier.uri http://hdl.handle.net/10220/8311
dc.description.abstract 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.
dc.language.iso en
dc.relation.ispartofseries The journal of physical chemistry C
dc.rights © 2009 American Chemical Society.
dc.subject DRNTU::Science::Medicine::Biomedical engineering.
dc.title Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction.
dc.type Journal Article
dc.contributor.school School of Chemical and Biomedical Engineering
dc.identifier.doi http://dx.doi.org/10.1021/jp909386d

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