title: Pt-decorated PdFe nanoparticles as methanol-tolerant oxygen reduction electrocatalyst.
abstract: The activity and selectivity of carbon-supported Pt-decorated PdFe nanoparticles in the oxygen reduction reaction (ORR) were investigated in the presence and absence of methanol. The Pt-decorated PdFe nanoparticles, which consist of a PdPt surface and a PdFe interior, were prepared by the galvanic reaction between PdFe/C alloy nanoparticles and PtCl4(2-) in aqueous solution. The presence of a Pt-enriched surface after the replacement reaction was independently confirmed by several microstructural characterization techniques and cyclic voltammetry. The catalyst with such heterogeneous architecture is catalytically more active than a bulk PdFePt alloy catalyst with the same overall composition. The observed enhancements in catalyst performance can be attributed to the lattice strain effect between the shell and core components. The Pt-decorated PdFe (PdFe@PdPt/C) catalyst also compares favorably with a commercial Pt/C catalyst with four times as much Pt in terms of ORR activity, cost, and methanol tolerance.
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Yang
authors.forename: Weijiang
authors.initials: W
authors.lastname: Zhou
authors.forename: Chin Hsien
authors.initials: CH
authors.lastname: Cheng
authors.forename: Jim Yang
authors.initials: JY
authors.lastname: Lee
authors.forename: Zhaolin
authors.initials: Z
authors.lastname: Liu
mesh_terms: D055664:Electrochemical Techniques; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*
chemical_list: D010984:Platinum; D007501:Iron; D010100:Oxygen; D000432:Methanol