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Start Over Author "Atlan, Clément" Topic [chim.cata]chemical sciences/catalysis
5 results on '"Atlan, Clément"'

1. In situ and operando 3D imaging of Pt and Pd electrocatalytic nanocrystals

Author

Atlan, Clément, Chatelier, Corentin, Viola, Arnaud, Dupraz, Maxime, Leake, Steven, Eymery, J., Maillard, Frédéric, Richard, Marie‐ingrid, European Synchroton Radiation Facility [Grenoble] (ESRF), Electrochimie Interfaciale et Procédés (EIP), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Nanostructures et Rayons X (NRX), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), The Minerals, Metals & Materials Society (TMS), European Project: 818823,CARINE, European Project: 952184,HERMES, and Nanostructures et Rayonnement Synchrotron (NRS )

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.CATA]Chemical Sciences/Catalysis
Abstract

International audience; Structural properties of transition metal are critical to understand the catalytic behavior of electrochemical processes. Here we show that 200 nm Pt and 500 nm Pd nanocrystals can be probed in situ and operando through Bragg Coherent X-ray Diffraction Imaging. This lens-less technique enables determining the morphology as well as mapping the strain and displacement fields of such nanoparticles. By measuring the Pt 002 Bragg reflection we show evidence of heterogeneous and potential-dependent strain distribution between highly-coordinated ({100} and {111} facets) and under-coordinated atoms (edges and corners) as well as evidence of strain propagation from the surface to the bulk of the nanoparticle. This allows to unveil adsorption sites. We also demonstrate that the formation of highly strained palladium hydride nanocrystals can be tracked under potential control. Even though the beta phase (hydrogen rich) Bragg peak comes and vanishes at relevant potentials, the nanocrystal does not recover its pristine morphology.

Published
2023

2. Breathing Pt nanoparticle imaged using in situ BCDI

Author

Atlan, Clément, Chatelier, Corentin, Martens, Isaac, Dupraz, Maxime, Leake, Steven, Richard, Marie-Ingrid, Viola, Arnaud, Maillard, Frédéric, Electrochimie Interfaciale et Procédés (EIP), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), European Synchroton Radiation Facility [Grenoble] (ESRF), ESRF, European Project: 818823,CARINE, and European Project: 952184,HERMES

Subjects
[CHIM.CATA]Chemical Sciences/Catalysis, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; The relationship between surface strain and the rate of a (electro-)catalytic reaction was unveiled by Hammer and Nørskov using density functional theory (DFT) calculations [1,2]. They proposed that the rate of the sluggish oxygen reduction reaction (ORR) would be enhanced on Pt-based catalysts binding *OH species ca. 0.10 - 0.15 eV more weakly than Pt(111), [1, 2] later experimentally verified using a Pt3Ni(111)-skin surface.[3] Nevertheless these predictions did not translate to Pt-based nanocatalysts, in part because these feature present multiple catalytic sites with a range of binding energies. Also, DFT calculations consider catalytic surfaces in vacuum, i.e. in the absence of water molecules and electric field. Hence, an in situ picture of how strain is distributed on Pt-based surfaces is still lacking.In this contribution, we took benefit of recent advances in Bragg Coherent Diffraction Imaging (BCDI) [4, 5] and of the fourth generation Extremely Brilliant Source of the European Synchrotron (ESRF-EBS, Grenoble, France) to map strain over Pt nanoparticles in electrochemical environment. Our results reveal that strain is heterogeneously distributed between highly- and weakly-coordinated surface atoms, and propagates from the surface to the bulk of the Pt nanoparticle as (bi)sulphates anions adsorb on the surface.

Published
2023

3. Imaging the Breathing of a Platinum Nanoparticle in Electrochemical Environment

Author

Atlan, Clément, Chatelier, Corentin, Dupraz, Maxime, Martens, Isaac, Viola, Arnaud, Li, Ni, Gao, Lu, Leake, Steven J., Schülli, Tobias U., Eymery, Joël, Maillard, Frédéric, Richard, Marie-Ingrid, Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), European Synchroton Radiation Facility [Grenoble] (ESRF), Electrochimie Interfaciale et Procédés (EIP), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Eindhoven University of Technology [Eindhoven] (TU/e), ANR-19-ENER-0008,BRIDGE,Vers l'intégration de catalyseurs performants dans des électrodes de pile à combustible efficaces(2019), and European Project: 818823,CARINE

Subjects
Condensed Matter - Materials Science, Strain 3D, Coherent diffraction imaging, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Platinum and palladium catalysts, Electrocatalysis in situ and operando, [CHIM.CATA]Chemical Sciences/Catalysis
Abstract

Surface strain is widely used in gas phase catalysis and electrocatalysis to control the binding energies of adsorbates on metal surfaces. However, $in$ $situ$ or $operando$ strain measurements are experimentally challenging, especially on nanomaterials. Here, we take advantage of the 4$^{th}$ generation Extremely Brilliant Source at the European Synchrotron Radiation Facility (ESRF-EBS, Grenoble, France) to quantify the distribution of strain inside a Pt nanoparticle, and to determine its morphology in an electrochemical environment. Our results show for the first time evidence of heterogeneous and potential-dependent strain distribution between highly-coordinated ({100} and {111} facets) and under-coordinated atoms (edges and corners) as well as evidence of strain propagation from the surface to the bulk of the nanoparticle. These results provide dynamic structural insights to better simulate and design efficient nanocatalysts for energy storage and conversion applications.

Published
2022

4. Structural disorder in ORR electrocatalysis: operation mode, practical descriptors to quantify and foreseen challenges

Author

Chattot, Raphaël, Atlan, Clément, Viola, Arnaud, Chatelier, Corentin, Martens, Isaac, Roiron, Camille, Drnec, Jakub, Bordet, Pierre, Richard, Marie‐ingrid, Dubau, Laetitia, Maillard, Frédéric, Electrochimie Interfaciale et Procédés (EIP), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), European Synchroton Radiation Facility [Grenoble] (ESRF), Matériaux, Rayonnements, Structure (NEEL - MRS), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), ANR-19-ENER-0008,BRIDGE,Vers l'intégration de catalyseurs performants dans des électrodes de pile à combustible efficaces(2019), ANR-14-CE05-0003,HOLLOW,Au-delà des électrocatalyseurs traditionnels : des nanoparticules creuses de métal noble pour applications PEMFC(2014), European Project: 818823,CARINE, Maillard, Frédéric, Vers l'intégration de catalyseurs performants dans des électrodes de pile à combustible efficaces - - BRIDGE2019 - ANR-19-ENER-0008 - ANR-BMBF - VALID, Appel à projets générique - Au-delà des électrocatalyseurs traditionnels : des nanoparticules creuses de métal noble pour applications PEMFC - - HOLLOW2014 - ANR-14-CE05-0003 - Appel à projets générique - VALID, and Coherent diffrAction foR a look Inside Nanostructures towards atomic rEsolution: catalysis and interface - CARINE - 818823 - INCOMING

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Abstract

International audience; Due to strain and ligand effects, the simultaneous presence of concave and convex surfaces and their highly-defective nanostructure (atomic vacancies, grain boundaries), highly defective hollow PtNi/C electrocatalysts have proven to enhance remarkably the oxygen reduction reaction (ORR) kinetics [1,2]. Likewise, PtNi aerogel [3], jagged PtNi nanowires [4,5] feature both high concentration of structural defects and enhanced ORR activity. On the other hand, and inspired from single crystal approach, nanostructured octahedral-shaped PtNi/C electrocatalysts exhibiting only Pt(111) facets are among the most active ORR electrocatalysts [6,7]. This presentation will show how structure-activity-stability relationships of these two classes of materials can be unified via two descriptors derived from structural and electrochemical parameters respectively [8,9]. A special emphasis will be given on the stability trends of these two families of ORR electrocatalysts.

Published
2022

5. Mapping Strain in Platinum Nanoparticles via Bragg Coherent Diffraction Imaging

Author

Atlan, Clément, Richard, Marie‐ingrid, Martens, Isaac, Dupraz, Maxime, Chatelier, Corentin, Viola, Arnaud, Leake, Steven, Maillard, Frédéric, Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), European Synchroton Radiation Facility [Grenoble] (ESRF), Electrochimie Interfaciale et Procédés (EIP), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), The Electrochemical Society, ANR-19-ENER-0008,BRIDGE,Vers l'intégration de catalyseurs performants dans des électrodes de pile à combustible efficaces(2019), and European Project: 818823,CARINE

Subjects
[CHIM.CATA]Chemical Sciences/Catalysis, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; Variations in the interatomic distances lead to altered d-band centre for a given metal, and provide an elegant way to control its activity towards (electro)catalytic reactions (“strain-engineering” approach). The effect of strain was rationalized within the frame of the d-band theory of Hammer and Nørskov in the late 1990s [1,2]. The authors predicted that the rate of the sluggish oxygen reduction reaction (ORR) can be enhanced on catalysts binding *OH ca. 0.10 - 0.15 eV more weakly than Pt(111), [1, 2] and this prediction was experimentally verified using a Pt3Ni(111)-skin surface.[3] Nevertheless, these predictions hardly translated to nanomaterials, because of the wide variety of catalytic sites configurations. Also, the d-band theory mostly considers catalytic surfaces in vacuum, without any effect related to the electrical double layer and adsorption/desorption processes. Hence, an in situ picture of how strain develops on Pt-based surfaces is still lacking.In this contribution, we took benefit of recent advances in Bragg Coherent Diffraction Imaging (BCDI) [4, 5] and of the fourth generation Extremely Brilliant Source of the European Synchrotron (ESRF-EBS, Grenoble, France) to map strain over Pt nanoparticles in situ. Our results show that adsorption of anions causes appearance of compressive strain at under-coordinated (edges and corners) atoms and tensile strain at highly-coordinated ({001} and {111} facets) atoms. Strain heterogeneity increases with the electrode potential and reaches as large as 0.08 %. at ORR-relevant potential. These results provide direct insights into the dynamics of Pt nanoparticles in an electrochemical environment, andhave direct consequences for electrocatalysis in general, and for ORR electrocatalysis in particular.

Published
2022

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