title: Synthesis of highly active and stable Au-PtCu core-shell nanoparticles for oxygen reduction reaction.
abstract: Au-PtCu core-shell nanoparticles were successfully synthesized via galvanic replacement of Cu by Pt on hollow Au nano-spheres. Characterizations of the nanoparticles were conducted by X-ray diffraction (XRD), transmission electron microscopy (TEM), and electrochemical measurements. Results indicate 2-2.5 times higher specific activity and mass activity of the Au-PtCu catalysts than commercial Pt black and Pt/C in oxygen reduction reaction (ORR), measured in a rotating disk electrode system. Besides, thinner PtCu coating (25 nm thick, deposition time of 20 min) on the hollow Au nano-spheres demonstrated a pronounced CO oxidation peak shift (by 0.13 V) and long-term durability probably due to the unique core-shell structure and strong electronic coupling between the Au core and the PtCu shell.
authors.affiliation: Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, TX 76019, USA.
authors.forename: Chiajen
authors.initials: C
authors.lastname: Hsu
authors.forename: Chienwen
authors.initials: C
authors.lastname: Huang
authors.forename: Yaowu
authors.initials: Y
authors.lastname: Hao
authors.forename: Fuqiang
authors.initials: F
authors.lastname: Liu
mesh_terms: D003300:Copper / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D010984:Platinum; D006046:Gold; D003300:Copper; D010100:Oxygen