Journal Article

PUBDB-2025-00562

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Coherent X-ray Diffraction Imaging of a Twinned PtRh Catalyst Nanoparticle under Operando Conditions

Bachmann, L. J.DESY* ; Lapkin, D.DESY* ; Schober, J.-C.DESY* ; Dolling, S.DESY* ; Kim, Y. Y.XFEL.EU* ; Assalauova, D.DESY* ; Mukharamova, N.DESY* ; Dwivedi, J.DESY* ; Schulli, T.Extern* ; Keller, T. F.DESY* ; Vartaniants, I.DESY* ; Stierle, A. (Corresponding author)DESY*

2025
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsnano.4c15457  doi:10.3204/PUBDB-2025-00562

Abstract: We performed operando Bragg coherent X-ray diffraction imaging under CO oxidation,as well as oxidizing conditions on a pre-characterized single PtRh nanoparticleand found that this (111) oriented particle with truncated octahedral shape is twinnedwith a Σ3 twin boundary parallel to the SrTiO3 (001) support, at the height of thenanoparticle edges. We observed that the average strain at the twin boundary is higherunder CO oxidation conditions compared to pure CO or O2. In addition, we observedthat two new facets were forming during the oxidizing/reducing cycles. Furthermore,we found mixed edge/screw dislocations at the twin boundary, but only where the{111} side facets meet. Inducing such dislocations changes the local strain and theatomic structure of the nanoparticles, which may create more active sites close to thenanoparticle edges.

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. FS-Photon Science (FS-PS)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. SFB 1441 A05 - Struktur und Zusammensetzung von PtPd Modellkatalysatoren unter operando Bedingungen: Experiment und Theorie (A05) (446698573) (446698573)
3. NEP - Nanoscience Foundries and Fine Analysis - Europe|PILOT (101007417) (101007417)

Experiment(s):

1. DESY NanoLab: Microscopy
2. DESY NanoLab: Sample Preparation
3. DESY NanoLab: X-Ray Diffraction
4. Measurement at external facility

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 15 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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