2009
DOI: 10.1021/jp909386d
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Abstract: In this work, three types of MnO 2 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 microspher… Show more

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Cited by 441 publications
(315 citation statements)
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“…Other peaks are assigned to the tetragonal phase of a-MnO 2 (JCPDS 44-0141) indicating better crystallinity in strong acidic medium. 23,24 Moreover, a low intensity peak corresponding to the (002) plane (inset of Fig. 1(c)) of graphitic structure was observed in MnO 2 decorated GNR samples.…”
Section: Morphological and Structural Characterizationsmentioning
confidence: 94%
“…Other peaks are assigned to the tetragonal phase of a-MnO 2 (JCPDS 44-0141) indicating better crystallinity in strong acidic medium. 23,24 Moreover, a low intensity peak corresponding to the (002) plane (inset of Fig. 1(c)) of graphitic structure was observed in MnO 2 decorated GNR samples.…”
Section: Morphological and Structural Characterizationsmentioning
confidence: 94%
“…The intensive diffraction peaks appeared at 12.46°, 18.08°, 28.83°, 37.00°, 37.66°, 41.95°, 50.13°, 60.36°, 66.30°, 72.87°, respectively, which are characteristic peaks of α-MnO2 with the major peaks intensity at 18.08° [15,16]. α-MnO2 is constructed from the double chains of edge-sharing MnO6 octahedra, which are linked at the corners to form tunnel structures [17]. The morphology of prepared C-MnO2 was investigated by FESEM and the corresponding micrographs are shown in Figure 1B,C.…”
Section: Physical-chemical Characterizationmentioning
confidence: 99%
“…3.33 eV. The most intense doublet at 71.45 (4f7/2) and 74.78 eV (4f5/2) was due to the metallic Pt, corresponding to metallic platinum particles (Pt 0 ) [4,6,10,13,17]. To assess the chemical structure of the Pt/C-MnxO1+x catalyst, an extra sample of MnO2 annealed at 600 °C (same temperature used to anchor Pt nanoparticles on the C-MnO2 support) was examined by μRS.…”
Section: Physical-chemical Characterizationmentioning
confidence: 99%
“…Among the transition metal oxides, MnO 2 has drawn particular attention as an electrocatalyst owing to its low cost, high abundance and excellent ORR and OER catalytic activities in alkaline media. 14,15 Graphene and its derivatives have also been recognized as efficient catalysts owing to their superior electronic conductivities, fast charge-transport mobilities and high specific surface areas. 16,17 In addition, graphene can be used as a catalyst support to enhance the stability of the catalyst because of its chemical and electrochemical stabilities.…”
Section: Introductionmentioning
confidence: 99%