Escobar Cano, Giamper ; Wellmann, Merle ; Steinbach, Frank ; Thiem, Moritz ; Xie, Wenjie ; Weidenkaff, Anke ; Feldhoff, Armin (2024)
Enhanced performance of La 2 NiO 4+δ oxygen-transporting membranes using crystal facet engineering via microemulsion-based synthesis.
In: Chemistry of Materials, 36 (19)
doi: 10.1021/acs.chemmater.4c01570
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
La2NiO4+δ nanorods, synthesized via reverse microemulsion─a crystal facet engineering method─served as building blocks for developing oxygen transport membranes. Comparisons were drawn with ceramic membranes derived from commercial La2NiO4+δ nanoparticles. The membrane manufacturing process involved either conventional sintering or the field-assisted sintering technique/spark plasma sintering. The microstructure analysis of the initial powders and the resulting ceramics was thoroughly assessed by X-ray diffraction, scanning and transmission electron microscopy as well as energy-dispersive X-ray spectroscopy. As a consequence of the reaction conditions, the nanorods possess an orthorhombic crystal structure, with LaOBr present as a minor phase. Furthermore, the surface structure of the La2NiO4+δ nanorods was discerned via selected area electron diffraction, revealing a composition of (001)o-type and (1 1¯ 0)o-type facets on the sides and (110)o-type facets at the end, with additional facets observed between these surfaces. Among the sintering techniques, spark plasma sintering demonstrated superior performance, when applied to La2NiO4+δ nanorods, as it effectively preserved their rod-like nanostructure during the sintering process. The resulting nanorod-derived La2NiO4+δ ceramics exhibited excellent oxygen permeation, largely due to the large proportion of orthorhombic (1 1¯ 0)o-type surfaces in the rod-shaped grains, which correspond to tetragonal (010)t and (0 1¯ 0)t surfaces. The (1 1¯ 0)o-type facets facilitated the oxygen surface exchange, leading to improved oxygen permeation fluxes between 1023 and 1123 K compared to membranes derived from nanoparticles.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Escobar Cano, Giamper ; Wellmann, Merle ; Steinbach, Frank ; Thiem, Moritz ; Xie, Wenjie ; Weidenkaff, Anke ; Feldhoff, Armin |
| Art des Eintrags: | Bibliographie |
| Titel: | Enhanced performance of La 2 NiO 4+δ oxygen-transporting membranes using crystal facet engineering via microemulsion-based synthesis |
| Sprache: | Englisch |
| Publikationsjahr: | 24 September 2024 |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Chemistry of Materials |
| Jahrgang/Volume einer Zeitschrift: | 36 |
| (Heft-)Nummer: | 19 |
| DOI: | 10.1021/acs.chemmater.4c01570 |
| Kurzbeschreibung (Abstract): | La2NiO4+δ nanorods, synthesized via reverse microemulsion─a crystal facet engineering method─served as building blocks for developing oxygen transport membranes. Comparisons were drawn with ceramic membranes derived from commercial La2NiO4+δ nanoparticles. The membrane manufacturing process involved either conventional sintering or the field-assisted sintering technique/spark plasma sintering. The microstructure analysis of the initial powders and the resulting ceramics was thoroughly assessed by X-ray diffraction, scanning and transmission electron microscopy as well as energy-dispersive X-ray spectroscopy. As a consequence of the reaction conditions, the nanorods possess an orthorhombic crystal structure, with LaOBr present as a minor phase. Furthermore, the surface structure of the La2NiO4+δ nanorods was discerned via selected area electron diffraction, revealing a composition of (001)o-type and (1 1¯ 0)o-type facets on the sides and (110)o-type facets at the end, with additional facets observed between these surfaces. Among the sintering techniques, spark plasma sintering demonstrated superior performance, when applied to La2NiO4+δ nanorods, as it effectively preserved their rod-like nanostructure during the sintering process. The resulting nanorod-derived La2NiO4+δ ceramics exhibited excellent oxygen permeation, largely due to the large proportion of orthorhombic (1 1¯ 0)o-type surfaces in the rod-shaped grains, which correspond to tetragonal (010)t and (0 1¯ 0)t surfaces. The (1 1¯ 0)o-type facets facilitated the oxygen surface exchange, leading to improved oxygen permeation fluxes between 1023 and 1123 K compared to membranes derived from nanoparticles. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Werkstofftechnik und Ressourcenmanagement |
| Hinterlegungsdatum: | 08 Jan 2025 06:44 |
| Letzte Änderung: | 08 Jan 2025 10:46 |
| PPN: | 52511727X |
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