title: Role of electronic perturbation in stability and activity of Pt-based alloy nanocatalysts for oxygen reduction.
abstract: The design of electrocatalysts for polymer electrolyte membrane fuel cells must satsify two equally important fundamental principles: optimization of electrocatalytic activity and long-term stability in acid media (pH <1) at high potential (0.8 V). We report here a solution-based approach to the preparation of Pt-based alloy with early transition metals and realistic parameters for the stability and activity of Pt(3)M (M = Y, Zr, Ti, Ni, and Co) nanocatalysts for oxygen reduction reaction (ORR). The enhanced stability and activity of Pt-based alloy nanocatalysts in ORR and the relationship between electronic structure modification and stability were studied by experiment and DFT calculations. Stability correlates with the d-band fillings and the heat of alloy formation of Pt(3)M alloys, which in turn depends on the degree of the electronic perturbation due to alloying. This concept provides realistic parameters for rational catalyst design in Pt-based alloy systems.
authors.affiliation: Fuel Cell Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seoul 136-791, Korea.
authors.forename: Seung Jun
authors.initials: SJ
authors.lastname: Hwang
authors.forename: Soo-Kil
authors.initials: SK
authors.lastname: Kim
authors.forename: June-Gunn
authors.initials: JG
authors.lastname: Lee
authors.forename: Seung-Cheol
authors.initials: SC
authors.lastname: Lee
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Jang
authors.forename: Pil
authors.initials: P
authors.lastname: Kim
authors.forename: Tae-Hoon
authors.initials: TH
authors.lastname: Lim
authors.forename: Yung-Eun
authors.initials: YE
authors.lastname: Sung
authors.forename: Sung Jong
authors.initials: SJ
authors.lastname: Yoo
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002384:Catalysis; D004355:Drug Stability; D004563:Electrochemistry; D004581:Electronics; D036103:Nanotechnology; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*
chemical_list: D000497:Alloys; D010984:Platinum; D010100:Oxygen