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Bottom-up assembly of bimetallic nanocluster catalysts from oxide-supported single-atom precursors

Sarma, Bidyut B.; Agostini, Giovanni; Farpón, Marcos G.; Marini, Carlo; Pfänder, Norbert; Prieto, Gonzalo


The precise synthesis and stabilization of oxide-supported bimetallic clusters in the low-to-sub nanometer size regime is highly relevant in various fields, from optics and sensing to electrochemistry and catalysis. In surface-driven phenomena such as catalysis, avoiding metal segregation and agglomeration is essential for performance and stability under relevant operation conditions. Here we show how high-temperature oxidative crystal redispersion and oxide atom-trapping phenomena provide a widely valid route towards atomically dispersed bimetallic precursors which, upon reductive metal agglomeration, result in very small, uniformly sized and remarkably stable bimetallic clusters. For a PdPt/MgO system, oxidative redispersion leads to isolated Pd and Pt atoms stabilized by the MgO support up to overall surface metal contents of ca. 1.0 M$_{at}$ nm$_{-2}$, beyond which loading, atom-trapping oxide sites become exhausted and metal aggregation sets in. On the contrary, more conventional, milder-temperature activation protocols lead to significant metal segregation and markedly bimodal particle size populations already from comparatively lower metal contents. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000142289
Veröffentlicht am 25.01.2022
DOI: 10.1039/d1ta00421b
Zitationen: 7
Web of Science
Zitationen: 7
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2050-7488, 2050-7496
KITopen-ID: 1000142289
Erschienen in Journal of materials chemistry / A
Verlag Royal Society of Chemistry (RSC)
Band 9
Heft 13
Seiten 8401–8415
Nachgewiesen in Web of Science
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