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Title: Multisegment PtRu nanorods: Electrocatalysts with adjustable bimetallic pair sites
Authors: Liu, F.
Lee, J.Y. 
Zhou, W. 
Issue Date: Sep-2005
Citation: Liu, F., Lee, J.Y., Zhou, W. (2005-09). Multisegment PtRu nanorods: Electrocatalysts with adjustable bimetallic pair sites. Advanced Functional Materials 15 (9) : 1459-1464. ScholarBank@NUS Repository.
Abstract: Multisegment PtRu nanorods (Pt-Ru, Pt-Ru-Pt, Pt-Ru-Pt-Ru, Pt-Ru-Pt-Ru-Pt, Pt-Ru-Pt-Ru-Pt-Ru) with customizable lengths of the individual metals are obtained by the sequential electrodeposition of the metals into the pores of anodic aluminum oxide (AAO) membranes. Field-emission scanning electron microscopy (FESEM) shows that the nanorods are about 200 nm in diameter and 1.2 μm long, with 900 nm of total platinum-segment length. The alternating platinum and ruthenium segments can be easily differentiated using FESEM. X-ray diffractometry reveals that the platinum and ruthenium in the bimetallic nanorods are polycrystalline with face-centered cubic and hexagonal close-packed crystal lattice structures, respectively. The presence of Pt0, PtII, PtIV, Ru0, and RuVI on the surface of the bimetallic nanorods is demonstrated via X-ray photo-electron spectroscopy. The nanorods are catalytically active in the room-temperature electro-oxidation of methanol. The relative rates of reaction, recorded using chronoamperometry, show a linear relationship between the long-time (near-steady-state) current density and the number of Pt-Ru interfaces. The use of segmented nanorods with a controlled number of Pt-Ru interfaces removes many of the ambiguities in the interpretation of experimental data from conventional alloy catalysts and has provided a direct demonstration of the role of pair sites in bifunctional catalysis. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Advanced Functional Materials
ISSN: 1616301X
DOI: 10.1002/adfm.200400523
Appears in Collections:Staff Publications

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