%0 Journal Article
%A Polani, Shlomi
%A Shviro, Meital
%A Shokhen, Victor
%A Zysler, Melina
%A Glüsen, Andreas
%A Dunin-Borkowski, Rafal
%A Carmo, Marcelo
%A Zitoun, David
%T Size dependent oxygen reduction and methanol oxidation reactions: catalytic activities of PtCu octahedral nanocrystals
%J Catalysis science & technology
%V 10
%N 16
%@ 2044-4761
%C London
%I RSC Publ.
%M FZJ-2021-00754
%P 5501 - 5512
%D 2020
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000560593800010
%R 10.1039/D0CY00772B
%U https://juser.fz-juelich.de/record/890165