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Enhancement of oxygen reduction reaction on PtAu nanoparticles via CO induced surface Pt enrichment

Paper ID Volume ID Publish Year Pages File Format Full-Text
46019 46428 2013 7 PDF Available
Title
Enhancement of oxygen reduction reaction on PtAu nanoparticles via CO induced surface Pt enrichment
Abstract

To investigate the enhancement of the oxygen reduction reaction (ORR) activity on a carbon-supported PtAu alloy nanoparticle catalyst, the catalyst was subject to heat treatment at 423 K under a CO or Ar atmosphere. The surface composition was analyzed by XPS and the composition was shown to increase from 66 ± 2% (PtAu-AP) to 74 ± 2% (PtAu-CO) after heat treatment under a CO atmosphere, which was confirmed by electrochemical techniques, while the bulk composition was invariant at 55%. For the oxygen reduction reaction (ORR), the mass activity of PtAu-CO increased by 75.6% (33.2 A/gPt) when compared to that of PtAu-AP (18.9 A/gPt). Since the increase in EAS was only 15.8%, it was concluded that the specific activity was enhanced by 52.6% due to surface Pt segregation after heat treatment under a CO atmosphere. The enhanced specific activity was attributed to the reduced OH adsorption energy which was characterized by measuring the potential of total zero charge. The weaker OH adsorption was resulted from the higher Pt/Au ratio at the surface layers.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Surface enrichment of Pt in PtAu nanoparticles was achieved by CO induced segregation. ► The Pt enrichment was characterized by XPS and electrochemical analysis. ► A higher Pt area and weaker OH adsorption enhanced oxygen reduction reaction.

Keywords
Polymer electrolyte membrane fuel cell; Electrocatalysis; PtAu; Surface segregation; Pt enrichment; Oxygen reduction reaction
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Enhancement of oxygen reduction reaction on PtAu nanoparticles via CO induced surface Pt enrichment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 375–381
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us