About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Characterization of Materials through High Resolution Coherent Imaging
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Presentation Title |
Nanoscale Imaging of Electrochemically-induced Strain Dynamics in a Locally Polarized Pt Grain |
Author(s) |
Dina Sheyfer, Ruperto Mariano, Tomoya Kawaguchi, Wonsuk Cha, Ross Harder, Mathew Kanan, Stephan Hruszkewycz, Hoydoo You, Matthew Highland |
On-Site Speaker (Planned) |
Dina Sheyfer |
Abstract Scope |
Probing structural rearrangements in catalytic materials during electrocatalysis is challenging experimentally and further complicated by structural heterogeneities including crystalline defects, strain inhomogeneities, and variations in chemical composition. Nonetheless, in operando measurements are often the most direct ways to improve our understanding of catalytic reactions. To address this challenge, we demonstrate a new approach that combines a nanopipette electrochemical cell (NEC) with three-dimensional X-ray Bragg Coherent Diffractive Imaging (BCDI) to study how strain in a single Pt grain evolves in response to applied potential. During electrochemical polarization, in-situ BCDI measurements have revealed marked changes in surface strain arising from the Coulombic attraction between the electrode surface and the electrolyte ions in electrochemical double layers, while the strain in the bulk of the crystal remained unchanged. The concurrent surface redox reactions have a strong influence on the magnitude and nature of the strain dynamics under polarization. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Characterization, Thin Films and Interfaces |