Imaging the facet surface strain state of supported multi-faceted Pt nanoparticles during reaction

Maxime Dupraz (), Ni Li, Jérôme Carnis, Longfei Wu, Stéphane Labat, Corentin Chatelier, Rim Poll, Jan P. Hofmann, Ehud Almog, Steven J. Leake, Yves Watier, Sergey Lazarev, Fabian Westermeier, Michael Sprung, Emiel J. M. Hensen, Olivier Thomas, Eugen Rabkin and Marie-Ingrid Richard ()
Additional contact information
Maxime Dupraz: Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRS
Ni Li: Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRS
Jérôme Carnis: ESRF - The European Synchrotron
Longfei Wu: ESRF - The European Synchrotron
Stéphane Labat: Aix Marseille Université, CNRS, Université de Toulon, IM2NP UMR 7334
Corentin Chatelier: Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRS
Rim Poll: Eindhoven University of Technology
Jan P. Hofmann: Eindhoven University of Technology
Ehud Almog: Technion-Israel Institute of Technology
Steven J. Leake: ESRF - The European Synchrotron
Yves Watier: ESRF - The European Synchrotron
Sergey Lazarev: Deutsches Elektronen-Synchrotron (DESY)
Fabian Westermeier: Deutsches Elektronen-Synchrotron (DESY)
Michael Sprung: Deutsches Elektronen-Synchrotron (DESY)
Emiel J. M. Hensen: Eindhoven University of Technology
Olivier Thomas: Aix Marseille Université, CNRS, Université de Toulon, IM2NP UMR 7334
Eugen Rabkin: Technion-Israel Institute of Technology
Marie-Ingrid Richard: Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRS

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Nanostructures with specific crystallographic planes display distinctive physico-chemical properties because of their unique atomic arrangements, resulting in widespread applications in catalysis, energy conversion or sensing. Understanding strain dynamics and their relationship with crystallographic facets have been largely unexplored. Here, we reveal in situ, in three-dimensions and at the nanoscale, the volume, surface and interface strain evolution of single supported platinum nanocrystals during reaction using coherent x-ray diffractive imaging. Interestingly, identical {hkl} facets show equivalent catalytic response during non-stoichiometric cycles. Periodic strain variations are rationalised in terms of O2 adsorption or desorption during O2 exposure or CO oxidation under reducing conditions, respectively. During stoichiometric CO oxidation, the strain evolution is, however, no longer facet dependent. Large strain variations are observed in localised areas, in particular in the vicinity of the substrate/particle interface, suggesting a significant influence of the substrate on the reactivity. These findings will improve the understanding of dynamic properties in catalysis and related fields.

Date: 2022
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DOI: 10.1038/s41467-022-30592-1

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