Alloying effects of co-sputtered gold-platinum thin films on the oxygen reduction reaction in acidic electrolyte

Co-sputtering was utilized to form metastable solid solution Au/Pt alloy films across the entire range of possible compositions. Homogeneous mixing was achieved without nanoparticle geometries, thereby isolating the effects of alloying from nanoscale size effects on the oxygen reduction reaction (ORR). Furthermore, as-deposited near-surface compositions determined by XPS were within 10% of the bulk compositions determined by EDS indicating that extensive Au surface segregation was avoided by room temperature deposition. The alloys were electrochemically characterized via cyclic voltammetry in Ar-saturated 0.5 M H 2SO 4 and ORR activity and stability was investigated after O 2 saturation under oxidizing potentials. Compositions within the miscibility gap were found to be more electrocatalytic for O 2 reduction than the pure Pt film. However, intermediate compositions lacked stability with continuous potential cycling when compared to compositions near the edges of the gap which retained enhanced activity. ©The Electrochemical Society.

Full Text

Duke Authors

Cited Authors

  • Brown, B; Wolter, SD; Stoner, BR; Glass, JT

Published Date

  • 2008

Published In

Volume / Issue

  • 11 / 32

Start / End Page

  • 49 - 65

International Standard Serial Number (ISSN)

  • 1938-5862

Digital Object Identifier (DOI)

  • 10.1149/1.2992493

Citation Source

  • SciVal