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Title: Density functional study of the structure, stability and oxygen reduction activity of ultrathin platinum nanowires

Conference · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.047306jes· OSTI ID:1156706
 [1]; ORCiD logo [1];  [2];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We used density functional theory to study the difference in the structure, stability and catalytic reactivity between ultrathin, 0.5–1.0 nm diameter, platinum nanotubes and nanowires. Model nanowires were formed by inserting an inner chain of platinum atoms in small diameter nanotubes. In this way more stable, non-hollow structures were formed. The difference in the electronic structure of platinum nanotubes and nanowires was examined by inspecting the density of surface states and band structure. Furthermore, reactivity toward the oxygen reduction reaction of platinum nanowires was assessed by studying the change in the chemisorption energies of oxygen, hydroxyl, and hydroperoxyl groups, induced by converting the nanotube models to nanowires. Both ultrathin platinum nanotubes and nanowires show distinct properties compared to bulk platinum. Single-wall nanotubes and platinum nanowires with diameters larger than 1 nm show promise for use as oxygen reduction catalysts.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1156706
Journal Information:
Journal of the Electrochemical Society, Vol. 160, Issue 6; Conference: 222nd Electrochemical Society Meeting, Honolulu, HI, USA, 20121007, 20121012, Honolulu, HI (United States), 7-12 Oct 2012; ISSN 0013-4651
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English

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