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The Role of Cerium Valence in the Conversion Temperature of H$_2$Ti$_3$O$_7$ Nanoribbons to TiO$_2$-B and Anatase Nanoribbons, and Further to Rutile

Umek, Polona; Dürrschnabel, Michael ORCID iD icon 1; Molina-Luna, Leopoldo; Škapin, Srečo; Korošec, Romana Cerc; Bittencourt, Carla
1 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)

Abstract:

CeO$_2$-TiO$_2$ is an important mixed oxide due to its catalytic properties, particularly in heterogeneous photocatalysis. This study presents a straightforward method to obtain 1D TiO$_2$ nanostructures decorated with CeO$_2$ nanoparticles at the surface. As the precursor, we used H$_2$Ti$_3$O$_7$ nanoribbons prepared from sodium titanate nanoribbons by ion exchange. Two cerium sources with an oxidation state of +3 and +4 were used to obtain mixed oxides. HAADF–STEM mapping of the Ce$^{4+}$-modified nanoribbons revealed a thin continuous layer at the surface of the H$_2$Ti$_3$O$_7$ nanoribbons, while Ce$^{3+}$ cerium ions intercalated partially between the titanate layers. The phase composition and morphology changes were monitored during calcination between 620 °C and 960 °C. Thermal treatment led to the formation of CeO$_2$ nanoparticles on the surface of the TiO$_2$ nanoribbons, whose size increased with the calcination temperature. The use of Ce$^{4+}$ raised the temperature required for converting H$_2$Ti$_3$O$_7$ to TiO$_2$-B by approximately 200 °C, and the temperature for the formation of anatase. For the Ce$^{3+}$ batch, the presence of cerium inhibited the conversion to rutile. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162251
Veröffentlicht am 20.09.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2023
Sprache Englisch
Identifikator ISSN: 1420-3049
KITopen-ID: 1000162251
HGF-Programm 31.13.05 (POF IV, LK 01) Neutron-Resistant Structural Materials
Erschienen in Molecules
Verlag MDPI
Band 28
Heft 15
Seiten Art.-Nr.: 5838
Vorab online veröffentlicht am 03.08.2023
Schlagwörter TiO2, TiO2-B, anatase, CeO2, impregnation, ion exchange, transformation, calcination, CeO2-TiO2, mixed oxides
Nachgewiesen in Dimensions
Web of Science
Scopus
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