Operando Nanoscale Imaging of Electrochemically Induced Strain in a Locally Polarized Pt Grain.

Autor:	Sheyfer D; X-ray Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States.; Materials Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States., Mariano RG; Department of Chemistry, Stanford University, Stanford, California94305, United States.; Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts02141, United States., Kawaguchi T; Materials Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States.; Institute for Materials Research, Tohoku University, Sendai, 9808577, Japan., Cha W; X-ray Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States., Harder RJ; X-ray Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States., Kanan MW; Department of Chemistry, Stanford University, Stanford, California94305, United States., Hruszkewycz SO; Materials Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States., You H; Materials Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States., Highland MJ; X-ray Science Division, Argonne National Laboratory, Argonne, Illinois60439, United States.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2023 Jan 11; Vol. 23 (1), pp. 1-7. Date of Electronic Publication: 2022 Dec 21.
DOI:	10.1021/acs.nanolett.2c01015
Abstrakt:	Developing new methods that reveal the structure of electrode materials under polarization is key to constructing robust structure-property relationships. However, many existing methods lack the spatial resolution in structural changes and fidelity to electrochemical operating conditions that are needed to probe catalytically relevant structures. Here, we combine a nanopipette electrochemical cell with three-dimensional X-ray Bragg coherent diffractive imaging to study how strain in a single Pt grain evolves in response to applied potential. During polarization, marked changes in surface strain arise from the Coulombic attraction between the surface charge on the electrode and the electrolyte ions in the electrochemical double layers, while the strain in the bulk of the crystal remains unchanged. The concurrent surface redox reactions have a strong influence on the magnitude and nature of the strain changes under polarization. Our studies provide a powerful blueprint to understand how structural evolution influences electrochemical performance at the nanoscale.
Databáze:	MEDLINE
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