TY  - JOUR
AU  - Bachmann, Lydia Johanna
AU  - Lapkin, Dmitrii
AU  - Schober, Jan-Christian
AU  - Dolling, Silvan
AU  - Kim, Young Yong
AU  - Assalauova, Dameli
AU  - Mukharamova, Nastasia
AU  - Dwivedi, Jagrati
AU  - Schulli, Tobias
AU  - Keller, Thomas F.
AU  - Vartaniants, Ivan
AU  - Stierle, Andreas
TI  - Coherent X-ray Diffraction Imaging of a Twinned PtRh Catalyst Nanoparticle under Operando Conditions
JO  - ACS nano
VL  - 19
IS  - 26
SN  - 1936-0851
CY  - Washington, DC
PB  - Soc.
M1  - PUBDB-2025-00562
SP  - 23552 - 23563
PY  - 2025
AB  - 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 the111 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:40559514
DO  - DOI:10.1021/acsnano.4c15457
UR  - https://bib-pubdb1.desy.de/record/622926
ER  -