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- Title
Structurally ordered intermetallic platinum-cobalt core-shell nanoparticles with enhanced activity and stability as oxygen reduction electrocatalysts.
- Authors
Wang, Deli; Xin, Huolin L.; Hovden, Robert; Wang, Hongsen; Yu, Yingchao; Muller, David A.; DiSalvo, Francis J.; Abruña, Héctor D.
- Abstract
To enhance and optimize nanocatalyst performance and durability for the oxygen reduction reaction in fuel-cell applications, we look beyond Pt-metal disordered alloys and describe a new class of Pt-Co nanocatalysts composed of ordered Pt3Co intermetallic cores with a 2-3 atomic-layer-thick platinum shell. These nanocatalysts exhibited over 200% increase in mass activity and over 300% increase in specific activity when compared with the disordered Pt3Co alloy nanoparticles as well as Pt/C. So far, this mass activity for the oxygen reduction reaction is the highest among the Pt-Co systems reported in the literature under similar testing conditions. Stability tests showed a minimal loss of activity after 5,000 potential cycles and the ordered core-shell structure was maintained virtually intact, as established by atomic-scale elemental mapping. The high activity and stability are attributed to the Pt-rich shell and the stable intermetallic Pt3Co core arrangement. These ordered nanoparticles provide a new direction for catalyst performance optimization for next-generation fuel cells.
- Subjects
FUEL cells; NANOPARTICLES; INTERMETALLIC compounds; ELECTROCATALYSTS; PLATINUM; COBALT; MAGNETIC properties of metals
- Publication
Nature Materials, 2013, Vol 12, Issue 1, p81
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat3458