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Facet‐Dependent Strain Determination in Electrochemically Synthetized Platinum Model Catalytic Nanoparticles
Author(s) -
Carnis Jérôme,
Gao Lu,
Fernández Sara,
Chahine Gilbert,
Schülli Tobias U.,
Labat Stéphane,
Hensen Emiel J. M.,
Thomas Olivier,
Hofmann Jan P.,
Richard MarieIngrid
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202007702
Subject(s) - nanoparticle , materials science , faceting , facet (psychology) , platinum , platinum nanoparticles , catalysis , nanotechnology , context (archaeology) , nanocrystal , crystallography , chemistry , psychology , social psychology , paleontology , biochemistry , personality , biology , big five personality traits
Studying model nanoparticles is one approach to better understand the structural evolution of a catalyst during reactions. These nanoparticles feature well‐defined faceting, offering the possibility to extract structural information as a function of facet orientation and compare it to theoretical simulations. Using Bragg Coherent X‐ray Diffraction Imaging, the uniformity of electrochemically synthesized model catalysts is studied, here high‐index faceted tetrahexahedral (THH) platinum nanoparticles at ambient conditions. 3D images of an individual nanoparticle are obtained, assessing not only its shape but also the specific components of the displacement and strain fields both at the surface of the nanocrystal and inside. The study reveals structural diversity of shapes and defects, and shows that the THH platinum nanoparticles present strain build‐up close to facets and edges. A facet recognition algorithm is further applied to the imaged nanoparticles and provides facet‐dependent structural information for all measured nanoparticles. In the context of strain engineering for model catalysts, this study provides insight into the shape‐controlled synthesis of platinum nanoparticles with high‐index facets.