Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 10, Pages 3140-3144Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.11.109
Keywords
Oxygen; Hydrogen; Segregation; Nickel; Platinum
Funding
- Basic Energy Sciences of the Department of Energy (DOE/BES) [DE-FG02-00ER15104]
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The interchange between the Pt-Ni-Pt and Ni-Pt-Pt bimetallic configurations in O-2 and H-2 is confirmed experimentally at atmospheric pressure using in situ X-rayabsorption spectroscopy (XAS). The subsurface Pt-3d-Pt structure, a desirable configuration as cathode electrocatalysts for PEM fuel cells, is found to be preferred in the reducing environment of H2 Whereas the surface 3d-Pt-Pt configuration is preferred in O-2. This process has been found to be reversible, providing useful insights into the maintenance and regeneration of the desirable subsurface structure. (C) 2009 Elsevier B.V. All rights reserved.
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