Please use this identifier to cite or link to this item: http://rportal.lib.ntnu.edu.tw:80/handle/77345300/42369
Title: Surfactant-Directed Synthesis of Ternary Nanostructures: Nanocubes, Polyhedrons, Octahedrons, and Nanowires of PtNiFe.Their Shape-Dependent Oxygen Reduction Activity.
Authors: 國立臺灣師範大學化學系
S.-W. Chou
J.-J. Shyue
C.-H. Chien
Chia-Chun Chen
Y.-Y. Chen
P.-T. Chou
Issue Date: 10-Jul-2012
Publisher: American Chemical Society
Abstract: We report a rational method for preparation of ternary alloy (PtNiFe) nanocrystals with various shapes. PtNiFe nanocubes, polyhedrons, and octahedrons are prepared via fine-tuning the alloy compositions and surfactants, so that the crystal facet–surfactant bindings on the growth seed can be well controlled. Nanowires grow in the cylindrical template built via high concentrations of oleylamine. In the electrocatalysis examination, it appears that the oxygen reduction reaction (ORR) activities of all PtNiFe nanostructures outperform that of commercial Pt catalyst in the electrolyte of HClO4 or H2SO4. In HClO4, the order of ORR activity is as follows: octahedrons ≈ nanowires > polyhedrons > nanocubes. PtNiFe nanostructures enclosed by a (111) plane, such as octahedrons and nanowires, give the highest ORR activities. Conversely, in H2SO4, the ORR activity of PtNiFe nanocubes enclosed by {100} facets is the highest among these nanostructures. The ORR activity increases in the order of nanowires ≈ octahedrons < polyhedrons, establishing a shape dependency in the ORR activity, which is valuable upon performing nanocatalysis in fuel cells.
URI: http://rportal.lib.ntnu.edu.tw/handle/77345300/42369
ISSN: 0897-4756
Other Identifiers: ntnulib_tp_C0301_01_085
Appears in Collections:教師著作

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