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Disclosing Pt-Bimetallic Alloy Nanoparticle Surface Lattice Distortion with Electrochemical Probes
journal contribution
posted on 2019-12-13, 15:39 authored by Raphaël Chattot, Isaac Martens, Marion Scohy, Juan Herranz, Jakub Drnec, Frédéric Maillard, Laetitia DubauStructural defects
are of significant importance in (electro)catalysis,
as they provide sites of unusually high activity that find applications
in many key electrochemical processes. However, tools to characterize
surface defects remain scarce and complex, especially for nanocatalysts
where classical methods such as transmission electron microscopy or
X-ray scattering are limited in their ability to probe the structure
and distribution of the active surface sites. Herein, we show that
the ratio between the COads stripping charge (QCO) and the charge required to desorb under-potentially
deposited H atoms (QH) in structurally
disordered Pt-based nanocatalysts scales almost linearly with the
surface distortion descriptor obtained via advanced physical methods.
This trend is valid in both rotating disk electrode configuration
and in a real fuel cell device, thus providing the scientific community
with a powerful and versatile approach for semiquantitative estimation
of the surface lattice distortion in Pt-based catalysts without the
need for exhaustive structural characterization.
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Pt-based catalystssurface lattice distortionQ HDisclosing Pt-Bimetallic Alloy Nanoparticle Surface Lattice DistortionchargeCO adsdisk electrode configurationmethodsurface distortion descriptorsurface defectselectrochemical processessurface sitesfuel cell devicedesorb under-potentiallytransmission electron microscopyQ COElectrochemical Probes Structural defectsPt-based nanocatalysts scalesH atoms
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