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Title: Palladium Coated Copper Nanowires as a Hydrogen Oxidation Electrocatalyst in Base

The palladium (Pd) nanotubes we synthesized by the spontaneous galvanic displacement of copper (Cu) nanowires, are forming extended surface nanostructures highly active for the hydrogen oxidation reaction (HOR) in base. The synthesized catalysts produce specific activities in rotating disk electrode half-cells 20 times greater than Pd nanoparticles and about 80% higher than polycrystalline Pd. Although the surface area of the Pd nanotubes was low compared to conventional catalysts, partial galvanic displacement thrifted the noble metal layer and increased the Pd surface area. Moreover, the use of Pd coated Cu nanowires resulted in a HOR mass exchange current density 7 times greater than the Pd nanoparticles. The activity of the Pd coated Cu nanowires further nears Pt/C, producing 95% of the mass activity.
Authors:
 [1] ;  [2]
  1. Univ. of Delaware, Newark, DE (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Univ. of Delaware, Newark, DE (United States)
Publication Date:
OSTI Identifier:
1242019
Report Number(s):
NREL/JA--5900-64906
Journal ID: ISSN 0013-4651
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 162; Journal Issue: 8; Related Information: Journal of the Electrochemical Society; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION catalysts; fuel cells; hydrogen oxidation; hydroxide exchange; nanowires