TY  - JOUR
AU  - Stierle, Andreas
AU  - Kim, Young Yong
AU  - Keller, Thomas F.
AU  - Goncalves, Tiago J.
AU  - Abuin, Manuel
AU  - Runge, Henning
AU  - Gelisio, Luca
AU  - Carnis, Jerome
AU  - Vonk, Vedran
AU  - Plessow, Philipp N.
AU  - Vartaniants, Ivan
TI  - Single Alloy Nanoparticle X-ray Imaging during a Catalytic Reaction
JO  - Science advances
VL  - 7
IS  - 40
SN  - 2375-2548
CY  - Washington, DC [u.a.]
PB  - Assoc.
M1  - PUBDB-2021-03436
SP  - eabh0757
PY  - 2021
AB  - The imaging of active nanoparticles represents a milestone in decoding heterogeneous catalysts’ dynamics. We report the facet resolved, surface strain state of a single PtRh alloy nanoparticle on SrTiO3 determined by coherent x-ray diffraction imaging under catalytic reaction conditions. Density functional theory calculations allow us to correlate the facet surface strain state to its reaction environment dependent chemical composition. We find that the initially Pt 20 terminated nanoparticle surface gets Rh enriched under CO oxidation reaction conditions. The local composition is facet orientation dependent and the Rh enrichment is non-reversible under subsequent CO reduction. Tracking facet resolved strain and composition under operando conditions is crucial for a rational design of more efficient heterogeneous catalysts with tailored activity, selectivity and lifetime.
LB  - PUB:(DE-HGF)16
C6  - pmid:34597137
UR  - <Go to ISI:>//WOS:000703091100013
DO  - DOI:10.1126/sciadv.abh0757
UR  - https://bib-pubdb1.desy.de/record/462477
ER  -