Pd–Pt nanostructures on carbon nanofibers as an oxygen reduction electrocatalyst

A new oxygen reduction catalyst is made of Pd and Pt nanostructures (Pd–Pt) supported on a herring-bone arrangement of carbon nanofibers (NFs) and is synthesized in one pot by the sequential reduction of Pd 2+ and Pt 4+ in aqueous chloride solution with ethylene glycol and then adding the carbon NF...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (79), p.42009-42013
Main Authors: Godinez-Garcia, Andres, Gervasio, Dominic F.
Format: Article
Language:English
Subjects:
Carbon
Carbon fibers
Catalysts
Cathodes
Nanostructure
Palladium
Platinum
Reduction
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Summary:A new oxygen reduction catalyst is made of Pd and Pt nanostructures (Pd–Pt) supported on a herring-bone arrangement of carbon nanofibers (NFs) and is synthesized in one pot by the sequential reduction of Pd 2+ and Pt 4+ in aqueous chloride solution with ethylene glycol and then adding the carbon NF to precipitate the catalyst. The exchange current density for the oxygen reduction reaction (ORR) on Pd–Pt is 1.44 × 10 −4 mA cm −2 versus 1.41 × 10 −4 mA cm −2 for pure Pt as determined using a thin-film rotating disk electrode (TF-RDE) method. A single cell hydrogen anode and oxygen cathode fuel cell in which the cathode is catalyzed with Pd–Pt gives a performance as good as or better than with a commercial Pt catalyst in the cathode for the same total metal loading, 0.5 mg metal cm −2 . This shows the catalyst made of Pd–Pt supported on carbon NF is a low cost alternative to Pt on carbon, because it gives the same or better activity with less Pt.
ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA06507G