Surface Adsorption and Stabilization Effect of Iridium in Pt-based Alloy Catalysts for PEM Fuel Cell Cathodes Conference Paper uri icon

abstract

  • We examine a bimetallic alloy, Pt3Co, modified by addition of Iridium. The ternary alloy, Pt2IrCo, exhibits a strong Pt-segregation tendency to form a Pt-skin surface. The adsorption properties and electrochemical stability of Pt2IrCo(111) surface are studied using density functional theory and compared with Pt(111) and Pt3Co(111) surfaces. It is found that the Pt-skin surface of Pt2IrCo(111) has similar electrochemical stability to the Pt3Co(111) Pt-skin surface. The binding strength of OH is much weaker on the trimetallic Pt-skin surface, suggesting a possible activity enhancement for the oxygen reduction reaction. Further analyses reveal the origin of the catalytic activity and stability enhancement for the alloy.

published proceedings

  • PROTON EXCHANGE MEMBRANE FUEL CELLS 9

author list (cited authors)

  • Ma, Y., & Balbuena, P. B.

complete list of authors

  • Ma, Yuguang||Balbuena, Perla B

publication date

  • January 1, 2009 11:11 AM