Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 9, Issue 12, Pages 2848-2853Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.10.009
Keywords
oxygen-reduction; platinum; palladium; cobalt; alloy; XANES; EXAFS
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We synthesized Pt monolayer electrocatalysts for oxygen-reduction using a new method to obtain the supporting core-shell nanoparticles. They consist of a Pt monolayer deposited on carbon-supported Co-Pd core-shell nanoparticles with the diameter of 3-4 nm. The nanoparticles were made using a redox-transmetalation (electroless deposition) method involving the oxidation of Co by Pd cations, yielding a Pd shell around the Co core. The quality of the thus-formed core-shell structure was verified using transmission electron microscopy and X-ray absorption spectroscopy, while cyclic voltammetry was employed to confirm the lack of Co oxidation (dissolution). A Pt monolayer was deposited on the Co-Pd core-shell nanoparticles by the galvanic displacement of a Cu monolayer obtained by underpotential deposition. The total noble metal mass-specific activity of this Pt monolayer electrocatalyst was ca. 3-fold higher than that of commercial Pt/C electrocatalysts. (C) 2007 Elsevier B.V. All rights reserved.
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