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@ARTICLE{Dwivedi:620065,
author = {Dwivedi, Jagrati and Bachmann, Lydia J. and Jeromin, Arno
and Kulkarni, Satishkumar and Noei, Heshmat and Tănase,
Liviu C. and Tiwari, Aarti and de Souza Caldas, Lucas and
Schmidt, Thomas and Cuenya, Beatriz Roldan and Stierle,
Andreas and Keller, Thomas F.},
title = {{S}pectro-{M}icroscopy of {I}ndividual {P}t–{R}h
{C}ore–{S}hell {N}anoparticles during {C}ompeting
{O}xidation and {A}lloying},
journal = {ACS nano},
volume = {19},
number = {31},
issn = {1936-0851},
address = {Washington, DC},
publisher = {Soc.},
reportid = {PUBDB-2025-00003},
pages = {28516 - 28529},
year = {2025},
abstract = {The surface chemical composition of supported single Pt-Rh
core-shell nanoparticles was studied to understand the Rh
behavior in oxidizing and reducing gas environments using
spectro-microscopy with high spatial resolution. We combined
in situ X-ray photoemission electron microscopy with ex situ
scanning electron-, atomic force- and scanning
Auger-microscopy to distinguish Rh oxidation-reduction,
dewetting-sintering and alloying-segregation during the
course of the experiment. A more than $20\%$ higher Rh
3d$_{5/2}$ oxide to metal photoemission intensity ratio for
the Rh layer on top of the Pt-core was found as compared to
the bare strontium titanate (STO) oxide catalyst support in
close vicinity, where Rh/RhO$_x$ nanoparticles are forming.
At elevated temperatures, Rh diffuses into the Pt particle,
and this alloying at the Pt metal surface competes with the
Rh oxidation, whereas the Rh/RhO$_x$ nanoparticles on the
STO support are observed to sinter under identical oxidizing
and temperature environments. A nanoparticle facet dependent
analysis of selected Pt-core nanoparticles suggests that Rh
oxidation is most advanced on a small nanoparticle with a
low coordination top facet that we indexed by electron back
scatter diffraction, demonstrating the strength of our
correlative approach.},
cin = {FS-NL},
ddc = {540},
cid = {I:(DE-H253)FS-NL-20120731},
pnm = {632 - Materials – Quantum, Complex and Functional
Materials (POF4-632) / NEP - Nanoscience Foundries and Fine
Analysis - Europe|PILOT (101007417) / DFG project
G:(GEPRIS)390540038 - EXC 2008: Unifying Systems in
Catalysis "UniSysCat" (390540038)},
pid = {G:(DE-HGF)POF4-632 / G:(EU-Grant)101007417 /
G:(GEPRIS)390540038},
experiment = {EXP:(DE-H253)Nanolab-04-20150101 /
EXP:(DE-H253)Nanolab-01-20150101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:40736140},
doi = {10.1021/acsnano.5c07668},
url = {https://bib-pubdb1.desy.de/record/620065},
}