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Stability of PtZn Nanoparticles Supported on Carbon in Acidic Electrochemical Environments.

TitleStability of PtZn Nanoparticles Supported on Carbon in Acidic Electrochemical Environments.
Publication TypeJournal Article
Year of Publication2010
AuthorsSode, A, Musgrove, A, Bizzotto, D
JournalJournal of Physical Chemistry C
Volume114
Pagination546 - 553
Date Published2010///
ISBN Number1932-7447
Keywordsalloy platinum zinc nanoparticle stability oxygen electrochem redn acid, sequential electrodeposition platinum zinc nanoparticle supported carbon, stability platinum zinc nanoparticle supported carbon acidic electrochem environment
Abstract

The stability of Pt and PtZn alloy nanoparticles supported on glassy C toward metal dissoln. during oxygen redn. reaction (ORR) is detailed. The Pt/Zn nanoparticles were created using sequential electrodeposition steps. The electrochem. created particles are \~{}1:1 Pt:Zn, the as-created particles having a Pt rich surface as detd. by Auger electron spectroscopy. The Pt particles are spherical, while the Pt/Zn particles were oddly shaped. These Pt and PtZn particles were subjected to durability tests at various potentials in oxygen satd. H2SO4. The surface compn. of the PtZn particles was analyzed after fixed times at 0.75, 1.0, and 1.25 V/RHE. The Zn surface content was unchanged over 14 h at 0.75 V, substantially increased when conditioned at 1.0 V, and the Zn was absent from the surface after 2.5 h at 1.25 V. The Pt and PtZn nanoparticles were further analyzed using tapping mode AFM which found that the PtZn particles were more strongly adhered to the GC substrate as compared to similarly prepd. Pt nanoparticles. Heating at 120° for 2 h caused the Pt nanoparticles to grow by aggregation, while the PtZn particles became more spherical. These measurements suggest that the PtZn alloy is stable at potentials <1.0 V/RHE during ORR, and that the PtZn alloy is more strongly adhered to the C surface than Pt. [on SciFinder(R)]