Journal Article

FZJ-2021-00754

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Size dependent oxygen reduction and methanol oxidation reactions: catalytic activities of PtCu octahedral nanocrystals

Polani, S. (Corresponding author) ; Shviro, M.FZJ* ; Shokhen, V. ; Zysler, M. ; Glüsen, A.FZJ* ; Dunin-Borkowski, R.FZJ* ; Carmo, M.FZJ* ; Zitoun, D.

2020
RSC Publ. London

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Please use a persistent id in citations: http://hdl.handle.net/2128/27008  doi:10.1039/D0CY00772B

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.

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-14)
2. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 134 - Electrolysis and Hydrogen (POF3-134) (POF3-134)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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