Details
| Original language | English |
|---|---|
| Pages (from-to) | 3310-3318 |
| Number of pages | 9 |
| Journal | Journal of solid state chemistry |
| Volume | 184 |
| Issue number | 12 |
| Early online date | 17 Oct 2011 |
| Publication status | Published - Dec 2011 |
Abstract
Alkaline earth-free La2NiO4δ based materials were synthesized by a solgel method and studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques as well as oxygen permeation experiments. Effects of doping the nickel position with a variety of cations (Al, Co, Cu, Fe, Mg, Ta, and Zr) were investigated with regards to oxygen flux and microstructure. Doping was always found to diminish the oxygen flux as compared to the reference composition. However, larger grains, which were achieved by longer annealing times at 1723 K have a minor negative impact on oxygen permeation flux in case of La 2NiO4δ and La2Ni0.9Fe 0.1O4δ system. Mössbauer spectroscopy shows that the iron-doped system exhibits a secondary phase, which was identified by high-resolution transmission electron microscopy (HRTEM) as a higher Ruddlesden-Popper phase. In-situ XRD in an atmosphere containing 50 vol% CO 2 and long-term oxygen permeation experiments using pure CO 2 as the sweep gas revealed a high tolerance of the materials towards CO2.
Keywords
- Carbon dioxide, KNiF structure, Long-term stability, Mixed ionic-electronic conductor, Mössbauer, Transmission electron microscopy
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemistry(all)
- Inorganic Chemistry
- Materials Science(all)
- Materials Chemistry
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In: Journal of solid state chemistry, Vol. 184, No. 12, 12.2011, p. 3310-3318.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of doping, microstructure, and CO2 on La 2NiO4+δ-based oxygen-transporting materials
AU - Klande, Tobias
AU - Efimov, Konstantin
AU - Cusenza, Salvatore
AU - Becker, Klaus Dieter
AU - Feldhoff, Armin
N1 - Funding Information: Financial support from the State of Lower Saxony in the frame of NTH bottom-up project No. 21-71023-25-7/09 is gratefully acknowledged. The authors thank Dr. M. Rodewald and Dr. J. Heindl, JEOL (Germany) GmbH, for SEM measurements.
PY - 2011/12
Y1 - 2011/12
N2 - Alkaline earth-free La2NiO4δ based materials were synthesized by a solgel method and studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques as well as oxygen permeation experiments. Effects of doping the nickel position with a variety of cations (Al, Co, Cu, Fe, Mg, Ta, and Zr) were investigated with regards to oxygen flux and microstructure. Doping was always found to diminish the oxygen flux as compared to the reference composition. However, larger grains, which were achieved by longer annealing times at 1723 K have a minor negative impact on oxygen permeation flux in case of La 2NiO4δ and La2Ni0.9Fe 0.1O4δ system. Mössbauer spectroscopy shows that the iron-doped system exhibits a secondary phase, which was identified by high-resolution transmission electron microscopy (HRTEM) as a higher Ruddlesden-Popper phase. In-situ XRD in an atmosphere containing 50 vol% CO 2 and long-term oxygen permeation experiments using pure CO 2 as the sweep gas revealed a high tolerance of the materials towards CO2.
AB - Alkaline earth-free La2NiO4δ based materials were synthesized by a solgel method and studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques as well as oxygen permeation experiments. Effects of doping the nickel position with a variety of cations (Al, Co, Cu, Fe, Mg, Ta, and Zr) were investigated with regards to oxygen flux and microstructure. Doping was always found to diminish the oxygen flux as compared to the reference composition. However, larger grains, which were achieved by longer annealing times at 1723 K have a minor negative impact on oxygen permeation flux in case of La 2NiO4δ and La2Ni0.9Fe 0.1O4δ system. Mössbauer spectroscopy shows that the iron-doped system exhibits a secondary phase, which was identified by high-resolution transmission electron microscopy (HRTEM) as a higher Ruddlesden-Popper phase. In-situ XRD in an atmosphere containing 50 vol% CO 2 and long-term oxygen permeation experiments using pure CO 2 as the sweep gas revealed a high tolerance of the materials towards CO2.
KW - Carbon dioxide
KW - KNiF structure
KW - Long-term stability
KW - Mixed ionic-electronic conductor
KW - Mössbauer
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=81755173428&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2011.10.019
DO - 10.1016/j.jssc.2011.10.019
M3 - Article
AN - SCOPUS:81755173428
VL - 184
SP - 3310
EP - 3318
JO - Journal of solid state chemistry
JF - Journal of solid state chemistry
SN - 0022-4596
IS - 12
ER -