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• W4233495031 abstract "Abstract CO adlayers on Pt(111) electrode surfaces are an important electrochemical system and of great relevance to electrocatalysis. The potential‐dependent structure and dynamics of these adlayers are complex and still controversial, especially in the CO pre‐oxidation regime. We here employ in situ high‐speed scanning tunneling microscopy for studying the surface phase behavior in CO‐saturated 0.1 m H 2 SO 4 on the millisecond time scale. At potentials near the onset of CO pre‐oxidation local fluctuations in the (2×2)‐CO adlayer are observed, which increase towards more positive potentials. Above 0.20 V (vs. Ag/AgCl), this leads to an adlayer where CO ad apparently reside on every top site, but still exhibit a (2×2) superstructure modulation. We interpret this observation as a dynamic effect, caused by a small number of highly mobile point defects in the (2×2)‐CO adlayer. As shown by density functional theory calculations, the CO lattice near such defects relaxes into a local (1×1) arrangement, which can rapidly propagate across the surface. This scenario, where a static (2×2) CO ad sublattice coexists with a highly dynamic sublattice of partially occupied top sites, explains the pronounced CO ad surface mobility during electrooxidation." @default.
• W4233495031 created "2022-05-12" @default.
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• W4233495031 date "2020-02-18" @default.
• W4233495031 modified "2023-10-04" @default.
• W4233495031 title "The Dynamic Nature of CO Adlayers on Pt(111) Electrodes" @default.
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• W4233495031 doi "https://doi.org/10.1002/ange.201913412" @default.
• W4233495031 hasPublicationYear "2020" @default.
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