publication . Article . 2007

Improved Oxygen Reduction Activity on Pt3Ni(111) via Increased Surface Site Availability

Stamenkovic, Vojislav R.; Fowler, Ben; Mun, Bongjin Simon; Wang, Guofeng; Ross, Philip N.; Lucas, Christopher A.; Marković, Nenad M.;
Open Access
  • Published: 01 Feb 2007
  • Publisher: American Association for the Advancement of Science (AAAS)
Abstract
The slow rate of the oxygen reduction reaction (ORR) in the polymer electrolyte membrane fuel cell (PEMFC) is the main limitation for automotive applications. We demonstrated that the Pt3Ni(111) surface is 10-fold more active for the ORR than the corresponding Pt(111) surface and 90-fold more active than the current state-of-the-art Pt/C catalysts for PEMFC. The Pt3Ni(111) surface has an unusual electronic structure (d-band center position) and arrangement of surface atoms in the near-surface region. Under operating conditions relevant to fuel cells, its near-surface layer exhibits a highly structured compositional oscillation in the outermost and third layers, ...
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free text keywords: Multidisciplinary, Inorganic chemistry, Adsorption, Catalysis, Oxygen, chemistry.chemical_element, chemistry, Proton exchange membrane fuel cell, Electrolyte, Membrane, Electronic structure, Heterogeneous catalysis
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