title: Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts.
abstract: We report a new method for deposition of Pt on a metal core to develop real electrocatalysts with significantly reduced amounts of expensive Pt as well as enhanced activity for oxygen reduction reaction. Ru and Pd have different crystal structures and modify the electronic structure of Pt to a different extent (shifts in d-band center). They were chosen as core materials to examine whether hydroquinone dissolved in ethanol can be used to deposit additional Pt atoms onto preformed core nanoparticles, and whether the modified d-character of Pt on different host metals can result in the enhanced ORR activity. The physicochemical characteristics of Pd-Pt and Ru-Pt core-shell nanoparticles are investigated. The core-shell structure was identified through a combination of experimental methods, employing electron microscopy, electrochemical measurements, and synchrotron X-ray measurements such as powder X-ray diffraction, X-ray absorption fine structure, and X-ray photoelectron spectroscopy. The hydroquinone reduction method proved to be an excellent route for the epitaxial growth of a Pt shell on the metal cores, leading to enhanced ORR activities.
authors.affiliation: World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, Korea.
authors.forename: Tae-Yeol
authors.initials: TY
authors.lastname: Jeon
authors.forename: Nicola
authors.initials: N
authors.lastname: Pinna
authors.forename: Sung Jong
authors.initials: SJ
authors.lastname: Yoo
authors.forename: Docheon
authors.initials: D
authors.lastname: Ahn
authors.forename: Sun Hee
authors.initials: SH
authors.lastname: Choi
authors.forename: Marc-Georg
authors.initials: MG
authors.lastname: Willinger
authors.forename: Yong-Hun
authors.initials: YH
authors.lastname: Cho
authors.forename: Kug-Seung
authors.initials: KS
authors.lastname: Lee
authors.forename: Hee-Young
authors.initials: HY
authors.lastname: Park
authors.forename: Seung-Ho
authors.initials: SH
authors.lastname: Yu
authors.forename: Yung-Eun
authors.initials: YE
authors.lastname: Sung
mesh_terms: D002384:Catalysis; D011211:Electric Power Supplies; D055664:Electrochemical Techniques / Q000379:methods*; D006873:Hydroquinones / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology / Q000379:methods*; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry; D053260:Soot / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D006873:Hydroquinones; D053260:Soot; D010984:Platinum; D010165:Palladium; D012428:Ruthenium; C031927:hydroquinone