Probing of Pd4+ Species in a PdOx–CeO2 System by X-Ray Photoelectron Spectroscopy Full article
| Journal |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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| Output data | Year: 2021, Volume: 125, Number: 38, Pages: 20845–20854 Pages count : 10 DOI: 10.1021/acs.jpcc.1c04646 | ||
| Tags | Palladium, Metal nanoparticles, Mass spectrometry, Layers, Nanoparticles | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0003 |
Abstract:
The oxidized palladium nanoparticles comprising Pd4+ species were prepared by radio frequency (RF) discharge in an O2 atmosphere and analyzed with X-ray photoelectron spectroscopy. PdOx particles were deposited on CeO2 or the reference support (Ta2O5) with variation of the RF sputtering time. Regardless of the used support, small PdOx particles (d < 1 nm) contained only Pd2+ species, while an increase of the particle size led to the appearance of the additional oxidized Pd state—Pd4+. The stabilization of Pd4+ on the surface of defect PdO particles was proposed. The Pd4+ species in the PdOx/CeO2 system was stable during heating in ultra-high vacuum conditions up to 250 °C. Pd4+ species demonstrated a high reaction probability toward CO oxidation at room temperature. However, a transition from the relatively inert support (Ta2O5) to the reducible oxide (CeO2) did not lead to a significant improvement of the Pd4+ reaction probability. Pd4+ species could not be recovered by the exposure of the reduced systems to molecular oxygen at room temperature. The obtained results bring new insights into consideration of Pd4+ species as active sites for oxidation processes at low temperatures.
Cite:
Kibis L.S.
, Simanenko A.A.
, Stadnichenko A.I.
, Zaikovskii V.I.
, Boronin A.I.
Probing of Pd4+ Species in a PdOx–CeO2 System by X-Ray Photoelectron Spectroscopy
The Journal of Physical Chemistry C. 2021. V.125. N38. P.20845–20854. DOI: 10.1021/acs.jpcc.1c04646 WOS Scopus РИНЦ AN OpenAlex
Probing of Pd4+ Species in a PdOx–CeO2 System by X-Ray Photoelectron Spectroscopy
The Journal of Physical Chemistry C. 2021. V.125. N38. P.20845–20854. DOI: 10.1021/acs.jpcc.1c04646 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | May 27, 2021 |
| Accepted: | Aug 24, 2021 |
| Published online: | Sep 16, 2021 |
| Published print: | Sep 30, 2021 |
Identifiers:
| Web of science: | WOS:000704295900012 |
| Scopus: | 2-s2.0-85116063117 |
| Elibrary: | 47060850 |
| Chemical Abstracts: | 2021:2034099 |
| OpenAlex: | W3199369068 |