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- W2062191750 abstract "abstract Nanostructures containing Pt-ecks on Ag colloids (Pt^Ag) were prepared by Pt deposition from citratereduction of Pt IV Cl 26 or Pt II Cl 24 ions. The nanostructures prepared from Pt IV Cl 26 showed more or lessPt Ag alloying due to the galvanic replacement reaction between Pt IV Cl 26 and metallic Ag colloids. ThePt Ag alloying at the surface of Ag colloids was manipulated by tuning the atomic Pt/Ag ratio (m) duringpreparation. It was demonstrated that a proper Pt Ag alloying in a narrow composition window(0.47 6 m P 0.53) can led to a dramatic activity enhancement of Pt, up to one order of magnitude higher,for methanol electro-oxidation. 2008 Elsevier B.V. All rights reserved. 1. IntroductionIn view of the limited resources of platinum, construction ofhighly dispersive Pt-skin or Pt-rich entities on the surface of rela-tively inexpensive metal substrates has recently been practicedas novel approach to enhance the activity and utilization of Pt inelectrocatalysts for advanced fuel cells[1 7] . Remarkably en-hanced mass-specic activity of Pt in these bimetallic electrocat-alysts was attributed to the unusual electronic structure or atomarrangement in the near-surface regions[2 5] . We showed thatcontrolled deposition of small Pt-entities on Au nanoparticles (3 10 nm) can lead to Pt-on-Au nanostructures (symbolized as Pt^Au)with up to 100% Pt utilization (U" @default.
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- W2062191750 date "2008-06-01" @default.
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- W2062191750 title "Proper alloying of Pt with underlying Ag nanoparticles leads to dramatic activity enhancement of Pt electrocatalyst" @default.
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- W2062191750 doi "https://doi.org/10.1016/j.elecom.2008.04.010" @default.
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