Details
| Original language | English |
|---|---|
| Pages (from-to) | 9557-9574 |
| Number of pages | 18 |
| Journal | Chemistry of materials |
| Volume | 36 |
| Issue number | 19 |
| Early online date | 24 Sept 2024 |
| Publication status | Published - 8 Oct 2024 |
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 (1Formula Presented0)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 (1Formula Presented0)o-type surfaces in the rod-shaped grains, which correspond to tetragonal (010)t and (0Formula Presented0)t surfaces. The (1Formula Presented0)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.
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)
- Materials Chemistry
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In: Chemistry of materials, Vol. 36, No. 19, 08.10.2024, p. 9557-9574.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Enhanced Performance of La2NiO4+δ Oxygen-Transporting Membranes Using Crystal Facet Engineering via Microemulsion-Based Synthesis
AU - Escobar Cano, Giamper
AU - Wellmann, Merle
AU - Steinbach, Frank
AU - Thiem, Moritz
AU - Xie, Wenjie
AU - Weidenkaff, Anke
AU - Feldhoff, Armin
N1 - Publisher Copyright: © 2024 The Authors. Published by American Chemical Society.
PY - 2024/10/8
Y1 - 2024/10/8
N2 - 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 (1Formula Presented0)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 (1Formula Presented0)o-type surfaces in the rod-shaped grains, which correspond to tetragonal (010)t and (0Formula Presented0)t surfaces. The (1Formula Presented0)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.
AB - 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 (1Formula Presented0)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 (1Formula Presented0)o-type surfaces in the rod-shaped grains, which correspond to tetragonal (010)t and (0Formula Presented0)t surfaces. The (1Formula Presented0)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.
UR - http://www.scopus.com/inward/record.url?scp=85205916049&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.4c01570
DO - 10.1021/acs.chemmater.4c01570
M3 - Article
AN - SCOPUS:85205916049
VL - 36
SP - 9557
EP - 9574
JO - Chemistry of materials
JF - Chemistry of materials
SN - 0897-4756
IS - 19
ER -