Journal
SCIENCE
Volume 348, Issue 6240, Pages 1230-1234Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa8765
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Funding
- National Science Foundation (NSF) [DMR-1437263]
- Office of Naval Research (ONR) [N00014-15-1-2146]
- NSF [DMR-1352373]
- Extreme Science and Engineering Development Environment (XSEDE) [DMR130056, DMR140068]
- Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0008055]
- U.S. Department of Energy [DE-AC52-07NA27344]
- NSF within Center of Integrated Nanomechanical Systems [EEC-083219]
- Electron Imaging Center of Nanomachines at CNSI
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1352373] Funding Source: National Science Foundation
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Bimetallic platinum-nickel (Pt-Ni) nanostructures represent an emerging class of electrocatalysts for oxygen reduction reaction (ORR) in fuel cells, but practical applications have been limited by catalytic activity and durability. We surface-doped Pt3Ni octahedra supported on carbon with transition metals, termed M-Pt3Ni/C, where M is vanadium, chromium, manganese, iron, cobalt, molybdenum (Mo), tungsten, or rhenium. The Mo-Pt3Ni/C showed the best ORR performance, with a specific activity of 10.3 mA/cm(2) and mass activity of 6.98 A/mg(Pt), which are 81- and 73-fold enhancements compared with the commercial Pt/C catalyst (0.127 mA/cm(2) and 0.096 A/mg(Pt)). Theoretical calculations suggest that Mo prefers subsurface positions near the particle edges in vacuum and surface vertex/edge sites in oxidizing conditions, where it enhances both the performance and the stability of the Pt3Ni catalyst.
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