TY  - JOUR
AU  - Polani, Shlomi
AU  - Shviro, Meital
AU  - Shokhen, Victor
AU  - Zysler, Melina
AU  - Glüsen, Andreas
AU  - Dunin-Borkowski, Rafal
AU  - Carmo, Marcelo
AU  - Zitoun, David
TI  - Size dependent oxygen reduction and methanol oxidation reactions: catalytic activities of PtCu octahedral nanocrystals
JO  - Catalysis science & technology
VL  - 10
IS  - 16
SN  - 2044-4761
CY  - London
PB  - RSC Publ.
M1  - FZJ-2021-00754
SP  - 5501 - 5512
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000560593800010
DO  - DOI:10.1039/D0CY00772B
UR  - https://juser.fz-juelich.de/record/890165
ER  -