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Title: A Mössbauer spectral study of degradation in La 0.58Sr 0.4Fe 0.5Co 0.5O 3–x after long-term operation in solid oxide electrolysis cells

Abstract

Here, degradation processes of oxygen electrodes in solid oxide electrolysis cells (SOECs) were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Mössbauer spectroscopy. La 0.58Sr 0.4Fe 0.5Co 0.5O 3–x (LSCF) anodes (oxygen electrode) were analyzed after different long-term operations durations of 1774, 6100 and 9000 h. The results were compared with a cell in the initial state. Besides the LSCF anode, the SOECs were composed of a Ce 0.8Gd 0.2O 1.9 barrier layer between the anode and electrolyte, yttria-stabilized zirconia (YSZ) as electrolyte and Ni-YSZ as cathode (hydrogen electrode). Mössbauer spectra of the iron-containing anode were acquired in order to determine the alteration of the iron oxidation state and its local environment during operation. Mössbauer spectroscopy yields indirect information about the degradation mechanism, especially in combination with SEM, TEM, and XRD. XRD and TEM revealed the appearance of Co 3O 4 during the SOEC operation and SEM analyses confirmed the formation of SrZrO 3 at the electrode/electrolyte interface. The spectral analysis confirmed the reduction of iron from Fe(IV) to Fe(III) in LSCF after long-term operation. The fraction of Fe(IV) in the electrode decreased with time and 18, 15, 13 and 11% were obtained formore » 0, 1774, 6100, and 9000 h of operation, respectively.« less

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Univ. of Liege, Liege (Belgium); Forschungszentrum Julich GmbH, Julich (Germany)
  2. Forschungszentrum Julich GmbH, Julich (Germany)
  3. Forschungszentrum Julich GmbH, Julich (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1407788
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Solid State Ionics
Additional Journal Information:
Journal Volume: 312; Journal Issue: C; Journal ID: ISSN 0167-2738
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; SOEC; Mössbauer spectroscopy; Degradation; Safety; Oxygen electrode

Citation Formats

Mahmoud, Abdelfattah, Daroukh, Mahmoud Al, Lipinska-Chwalek, Marta, Luysberg, Martina, Tietz, Frank, and Hermann, Raphael P. A Mössbauer spectral study of degradation in La0.58Sr0.4Fe0.5Co0.5O3–x after long-term operation in solid oxide electrolysis cells. United States: N. p., 2017. Web. doi:10.1016/j.ssi.2017.10.003.
Mahmoud, Abdelfattah, Daroukh, Mahmoud Al, Lipinska-Chwalek, Marta, Luysberg, Martina, Tietz, Frank, & Hermann, Raphael P. A Mössbauer spectral study of degradation in La0.58Sr0.4Fe0.5Co0.5O3–x after long-term operation in solid oxide electrolysis cells. United States. doi:10.1016/j.ssi.2017.10.003.
Mahmoud, Abdelfattah, Daroukh, Mahmoud Al, Lipinska-Chwalek, Marta, Luysberg, Martina, Tietz, Frank, and Hermann, Raphael P. Sat . "A Mössbauer spectral study of degradation in La0.58Sr0.4Fe0.5Co0.5O3–x after long-term operation in solid oxide electrolysis cells". United States. doi:10.1016/j.ssi.2017.10.003.
@article{osti_1407788,
title = {A Mössbauer spectral study of degradation in La0.58Sr0.4Fe0.5Co0.5O3–x after long-term operation in solid oxide electrolysis cells},
author = {Mahmoud, Abdelfattah and Daroukh, Mahmoud Al and Lipinska-Chwalek, Marta and Luysberg, Martina and Tietz, Frank and Hermann, Raphael P.},
abstractNote = {Here, degradation processes of oxygen electrodes in solid oxide electrolysis cells (SOECs) were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Mössbauer spectroscopy. La0.58Sr0.4Fe0.5Co0.5O3–x (LSCF) anodes (oxygen electrode) were analyzed after different long-term operations durations of 1774, 6100 and 9000 h. The results were compared with a cell in the initial state. Besides the LSCF anode, the SOECs were composed of a Ce0.8Gd0.2O1.9 barrier layer between the anode and electrolyte, yttria-stabilized zirconia (YSZ) as electrolyte and Ni-YSZ as cathode (hydrogen electrode). Mössbauer spectra of the iron-containing anode were acquired in order to determine the alteration of the iron oxidation state and its local environment during operation. Mössbauer spectroscopy yields indirect information about the degradation mechanism, especially in combination with SEM, TEM, and XRD. XRD and TEM revealed the appearance of Co3O4 during the SOEC operation and SEM analyses confirmed the formation of SrZrO3 at the electrode/electrolyte interface. The spectral analysis confirmed the reduction of iron from Fe(IV) to Fe(III) in LSCF after long-term operation. The fraction of Fe(IV) in the electrode decreased with time and 18, 15, 13 and 11% were obtained for 0, 1774, 6100, and 9000 h of operation, respectively.},
doi = {10.1016/j.ssi.2017.10.003},
journal = {Solid State Ionics},
number = C,
volume = 312,
place = {United States},
year = {Sat Oct 21 00:00:00 EDT 2017},
month = {Sat Oct 21 00:00:00 EDT 2017}
}

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