| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Materials through High Resolution Coherent Imaging
|
| Presentation Title |
In Situ and Operando 3D Imaging of Pt and Pd Electrocatalytic Nanocrystals |
| Author(s) |
Clement Atlan, Corentin Chatelier, Arnaud Viola, Maxime Dupraz, Isaac Martens, Joël Eymery, Frédéric Maillard, Marie-Ingrid Richard |
| On-Site Speaker (Planned) |
Clement Atlan |
| Abstract Scope |
Structural properties of transition metal are critical to understand the catalytic behavior of electrochemical processes. Here we show that Pt and Pd nanocrystals can be probed in situ and operando at the fourth generation Extremely Brilliant Source of ESRF by 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 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 comes and vanishes at relevant potentials, the nanocrystal does not recover its pristine morphology. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |