Počet záznamů: 1
Absence of a pressure gap and atomistic mechanism of the oxidation of pure Co nanoparticles
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SYSNO ASEP 0567955 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Absence of a pressure gap and atomistic mechanism of the oxidation of pure Co nanoparticles Tvůrce(i) Vijayakumar, J. (CH)
Savchenko, T. M. (CH)
Bracher, D. M. (CH)
Lumbeeck, G. (BE)
Béché, A. (BE)
Verbeeck, J. (BE)
Vajda, Štefan (UFCH-W) RID, ORCID
Nolting, F. (CH)
Vaz, C. A. F. (CH)
Kleibert, A. (CH)Číslo článku 174 Zdroj.dok. Nature Communications. - : Nature Publishing Group
Roč. 14, č. 1 (2023)Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Chemical physics ; Heterogeneous catalysis ; Nanoparticles Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Obor OECD Physical chemistry Způsob publikování Open access Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000955726400021 EID SCOPUS 85146195032 DOI 10.1038/s41467-023-35846-0 Anotace Understanding chemical reactivity and magnetism of 3d transition metal nanoparticles is of fundamental interest for applications in fields ranging from spintronics to catalysis. Here, we present an atomistic picture of the early stage of the oxidation mechanism and its impact on the magnetism of Co nanoparticles. Our experiments reveal a two-step process characterized by (i) the initial formation of small CoO crystallites across the nanoparticle surface, until their coalescence leads to structural completion of the oxide shell passivating the metallic core, (ii) progressive conversion of the CoO shell to Co3O4 and void formation due to the nanoscale Kirkendall effect. The Co nanoparticles remain highly reactive toward oxygen during phase (i), demonstrating the absence of a pressure gap whereby a low reactivity at low pressures is postulated. Our results provide an important benchmark for the development of theoretical models for the chemical reactivity in catalysis and magnetism during metal oxidation at the nanoscale. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2024 Elektronická adresa https://hdl.handle.net/11104/0339263
Počet záznamů: 1