Journal Article

PUBDB-2025-04449

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In situ X-ray imaging of segregation and mixing in PtPd core-shell nanoparticles under methane oxidation conditions

Bachmann, L. J.DESY* ; Dwivedi, J.DESY* ; Lapkin, D.Extern*DESY* ; Wang, B.DESY* ; Schober, J.-C.DESY* ; Hinsley, G.DESY* ; Bernart, S. ; Ngoi, K. H.DESY* ; Rysov, R.XFEL.EU*DESY* ; Dangwal Pandey, A.DESY* ; Keller, T. F.DESY* ; Vartaniants, I.DESY* ; Stierle, A. (Corresponding author)DESY*

2026
RSC Publ. Cambridge

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Please use a persistent id in citations: doi:10.1039/D5NR05321H  doi:10.3204/PUBDB-2025-04449

Abstract: The high global warming potential of methane requires the development of advanced catalysts for conversion with increased activity and a longer lifetime. Here we utilize in situ Bragg coherent diffraction imaging (BCDI) to follow the evolution of two PtPd model catalyst nanoparticles during methane oxidation with different initial arrangements, one core–shell and one partially alloyed nanoparticle. While heating the nanoparticles under reaction conditions we observe the mixing and segregation of Pt and Pd, indicating a partial alloying and de-alloying, and a preferred segregation of Pt towards {111} oriented surface facets with potential use as bifunctional catalyst. Our in situ BCDI data also indicate a complete core–shell inversion at elevated temperatures with Pd moving into the nanoparticle. This suggests that a maximum operation temperature should not be exceeded, since Pd oxide is the more active phase. In spite of such limitations, binary metal core–shell nanoparticles are promising candidates for novel catalysts, as the elemental arrangement at their surface may be better controlled – a pivotal step for improving future catalysts.

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. FS-Photon Science (FS-PS)
3. DOOR-User (DOOR ; HAS-User)
4. MID (XFEL_E1_MID)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. SFB 1441 A05 - Struktur und Zusammensetzung von PtPd Modellkatalysatoren unter operando Bedingungen: Experiment und Theorie (A05) (446698573) (446698573)
4. NEP - Nanoscience Foundries and Fine Analysis - Europe|PILOT (101007417) (101007417)

Experiment(s):

1. PETRA Beamline P10 (PETRA III)
2. DESY NanoLab: Microscopy
3. DESY NanoLab: Sample Preparation

Appears in the scientific report 2026

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Database coverage:
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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dataset Bachmann, L. J.Extern*DESY* ; Dwivedi, J.Extern*DESY* ; Lapkin, D. ; Wang, B. ; Schober, J.-C.Extern*DESY* ; Hinsley, G. N. ; Bernart, S. ; Ngoi, K. H. ; Rysov, R.XFEL.EU*DESY* ; Dangwal Pandey, A.DESY* ; Keller, T. F.XFEL.EU*DESY* ; Vartaniants, I.Extern*XFEL.EU*DESY* ; Stierle, A.XFEL.EU*DESY*
Raw data for manuscript Lydia J. Bachmann et al., In situ X-ray imaging of segregation and mixing in PtPd core-shell nanoparticles under methane oxidation conditions
[10.5281/ZENODO.17642484]   BibTeX | EndNote: XML, Text | RIS

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