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Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials

Radin, Edi; Štefanić, Goran; Dražić, Goran; Marić, Ivan; Jurkin, Tanja; Pustak, Anđela; Baran, Nikola; Raić, Matea; Gotić, Marijan (2021) Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials. Nanomaterials, 11 (12). ISSN 2079-4991

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The dispersion of platinum (Pt) on metal oxide supports is important for catalytic and gas sensing applications. In this work, we used mechanochemical dispersion and compatible Fe(II) acetate, Sn(II) acetate and Pt(II) acetylacetonate powders to better disperse Pt in Fe2O3 and SnO2. The dispersion of platinum in SnO2 is significantly different from the dispersion of Pt over Fe2O3. Electron microscopy has shown that the elements Sn, O and Pt are homogeneously dispersed in α-SnO2 (cassiterite), indicating the formation of a (Pt, Sn)O2 solid solution. In contrast, platinum is dispersed in α-Fe2O3 (hematite) mainly in the form of isolated Pt nanoparticles despite the oxidative conditions during annealing. The size of the dispersed Pt nanoparticles over α- Fe2O3 can be controlled by changing the experimental conditions and is set to 2.2, 1.2 and 0.8 nm. The rather different Pt dispersion in α- SnO2 and α-Fe2O3 is due to the fact that Pt4+ can be stabilized in the α-SnO2 structure by replacing Sn4+ with Pt4+ in the crystal lattice, while the substitution of Fe3+ with Pt4+ is unfavorable and Pt4+ is mainly expelled from the lattice at the surface of α-Fe2O3 to form isolated platinum nanoparticles.

Item Type: Article
Uncontrolled Keywords: platinum ; hematite ; cassiterite ; ball-milling ; mechanochemical ; Fe2O3 ; SnO2 ; dispersion ; XPS ; STEM
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Interdisciplinary Natural Sciences
Divisions: Division of Materials Chemistry
Division of Materials Physics
Project titleProject leaderProject codeProject type
Platinom dekorirane čvrste otopine željezovog i kositrovog oksida za vodikove senzoreGotić, MarijanIP-2019-04-1195HRZZ
Depositing User: Marijan Gotić
Date Deposited: 23 Feb 2022 11:36
DOI: 10.3390/nano11123349

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