Size dependent oxygen reduction and methanol oxidation reactions: Catalytic activities of PtCu octahedral nanocrystals

Shlomi Polani, Meital Shviro, Victor Shokhen, Melina Zysler, Andreas Glüsen, Rafal Dunin-Borkowski, Marcelo Carmo, David Zitoun

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The synthetic control through colloidal synthesis led to a remarkable increase in platinum mass activity in octahedral nanocrystals with a Pt-rich surface. In this manuscript, we demonstrate that the ratio of surfactant can tune the size of Pt surface enriched PtCu nano-octahedra from 8 to 18 nm with homogeneous size and shape on the carbon support. For the nano-octahedra, the Pt-rich surface has been determined by high-angle annular dark field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. The Pt-rich surface exhibits an increasing compressive strain with increasing surface of the {111} facets. With increasing surface, the PtCu nano-octahedra display higher oxygen reduction reaction (ORR) activity, which however leads to higher onset over-potentials in the methanol oxidation reaction (MOR) and CO-stripping. This observed trend for a series of size-selected nano-octahedra demonstrates the benefits of controlling the strained {111} Pt surface for the ORR and MOR activity.

Original languageEnglish
Pages (from-to)5501-5512
Number of pages12
JournalCatalysis Science and Technology
Volume10
Issue number16
DOIs
StatePublished - 21 Aug 2020

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

Funding

This work is supported by the Planning & Budgeting Committee of the Council of High Education and the Prime Minister Office of Israel, in the framework of the INREP project.

FundersFunder number
Council of High Education
Prime Minister office of Israel

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