The Effect of CO Treatment on the Surface Structure of Bimetallic Pd-Au/HOPG and Pd-In/HOPG Nanoparticles: A Comparative Study Full article
| Journal |
Nano-Structures and Nano-Objects
, E-ISSN: 2352-507X |
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| Output data | Year: 2022, Volume: 29, Article number : 100830, Pages count : 10 DOI: 10.1016/j.nanoso.2021.100830 | ||||||
| Tags | Intermetallic nanoparticles; Alloy design; Adsorption induced segregation; Scanning tunneling microscopy; X-ray photoelectron spectroscopy; Heterogeneous supported catalysts | ||||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 19-13-00285 |
Abstract:
Bimetallic nanoparticles have been attracting more and more attention as catalysts in recent years since they often
provide improved catalytic performance when compared to their monometallic analogues. Trying to design
the optimum configuration of active sites in such catalytic systems, researchers resort to different strategies, one
of which consists of a specific pretreatment of pre-synthesized nanoparticles in a particular gaseous environment
prior to the catalytic reaction, resulting in adsorption-induced segregation. However, such a strategy does not always
lead to any significant changes in the surface structure, so the identification of all factors responsible for the
segregation process is of high fundamental and applied interest for the targeted design of bimetallic catalytically
active nanoparticles. Here we show that for two types of bimetallic nanosystems, a stoichiometric intermetallic
compound of Pd and In, and a substitutional solid solution of Pd and Au, the exposure to a CO atmosphere leads
to completely different results, i.e., a noticeable surface segregation of Pd atoms being observed exclusively for
the latter system. Driven by adsorption of CO molecules, the process of segregation is enhanced in the studied Pd-
Au/HOPG catalyst (initial Pd/Au ratio of 1.48) when the temperature of the CO treatment is increased to 150 °C.
In contrast, the Pd-In/HOPG nanoparticles (initial Pd/In ratio of 1.35) show no considerable change in the apparent
surface atomic composition under a CO atmosphere, irrespective of temperature. Our results, alongside
previous findings, demonstrate that CO adsorption-induced segregation as a tool for target-oriented modification
of active sites in bimetallic nanoparticles for catalytic applications is appropriate only for substitutional solid solutions
having a reasonable number of contacts between atoms of one type prone to segregation.
Cite:
Fedorov A.Y.
, Bukhtiyarov A.V.
, Panafidin M.A.
, Prosvirin I.P.
, Chetyrin I.A.
, Smirnova N.S.
, Markov P.V.
, Zubavichus Y.V.
, Stakheev A.Y.
, Bukhtiyarov V.I.
The Effect of CO Treatment on the Surface Structure of Bimetallic Pd-Au/HOPG and Pd-In/HOPG Nanoparticles: A Comparative Study
Nano-Structures and Nano-Objects. 2022. V.29. 100830 :1-10. DOI: 10.1016/j.nanoso.2021.100830 Scopus РИНЦ ANCAN OpenAlex
The Effect of CO Treatment on the Surface Structure of Bimetallic Pd-Au/HOPG and Pd-In/HOPG Nanoparticles: A Comparative Study
Nano-Structures and Nano-Objects. 2022. V.29. 100830 :1-10. DOI: 10.1016/j.nanoso.2021.100830 Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Aug 12, 2021 |
| Accepted: | Nov 29, 2021 |
| Published online: | Dec 23, 2021 |
| Published print: | Feb 1, 2022 |
Identifiers:
| Scopus: | 2-s2.0-85121604687 |
| Elibrary: | 47546208 |
| Chemical Abstracts: | 2022:1025082 |
| Chemical Abstracts (print): | 178:351407 |
| OpenAlex: | W4200114292 |