Journal Article

PUBDB-2025-02587

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Non‐Random Island Nucleation in the Electrochemical Roughening on Pt(111)

Rost, M. (Corresponding author)Extern* ; Jacobse, L.Extern*DESY* ; Koper, M. T. M.Extern*

2023
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/ange.202216376  doi:10.3204/PUBDB-2025-02587

Abstract: Many chemical surface systems develop ordered nano-islands during repeated reaction and restoration. Platinum is used in electrochemical energy applications, like fuel cells and electrolysers, although it is scarce, expensive, and degrades. During oxidation-reduction cycles, simulating device operation, nucleation and growth of nano-islands occurs that eventually enhances the dissolution. Preventing nucleation would be the most effective solution. However, little is known about the atomic details of the nucleation; a process almost impossible to observe. Here, we analyze the nuclei-distance distribution mapping out the underlying atomic mechanism: a rarely observed, non-random nucleation takes place. Special, preferential nucleation sites that a priori do not exist, develop initially via a precursor and eventually form a semi-ordered Pt-oxide structure. This precursor mechanism seems to be general, possibly explaining also the nano-island formation on other surfaces/reactions.

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Contributing Institute(s):

1. Nanolab (FS-NL)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. DESY NanoLab: Microscopy

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Database coverage:
; ; ; DEAL Wiley ; Ebsco Academic Search ; Nationallizenz ; SCOPUS

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