期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 114, 期 3, 页码 1694-1700出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp909386d
关键词
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资金
- Nanyang Technological University
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 ID nanorods and nanotubes are of the alpha-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 alpha-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.
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