Enhancement of the electroreduction of oxygen on Pt alloys with Fe, Ni, and Co

Journal Article · Fri Oct 01 04:00:00 EDT 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1392544· OSTI ID:20001088

Toda, Takako; Igarashi, Hiroshi; Uchida, Hiroyuki; Watanabe, Masahiro

Electrocatalytic activity of Pt alloys with Ni, Co, and Fe, formed by sputtering, was investigated with regard to the oxygen reduction reaction (ORR) in perchloric acid solution. Hydrodynamic voltammograms with rotated electrodes were used to measure the electrocatalytic activity. Maximum activity was observed at ca. 30, 40, and 50% content of Ni, Co, and Fe, respectively, by which 10, 15, and 20 times larger kinetic current densities than that of pure Pt were attained. X-ray photoelectron spectroscopy analysis of the surfaces after the reaction indicated that the active surfaces were covered by a few monolayers of Pt. The authors present an enhancing mechanism for the ORR based on an increased d-electron vacancy of the thin Pt surface layer caused by underlying alloy. Results of this work contribute in development of new active cathode catalysts for fuel cells used as power sources of electric vehicles, etc.

• Research Organization: Yamanashi Univ., Kofu (JP)
• OSTI ID: 20001088
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 10 Vol. 146; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CATHODES
CHEMICAL REACTION KINETICS
COBALT ALLOYS
ELECTROCATALYSTS
FUEL CELLS
IRON ALLOYS
NICKEL ALLOYS
PLATINUM ALLOYS
REDOX REACTIONS
SPUTTERING