This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1016/j.ssi.2017.10.003 in citations.
A Mössbauer spectral study of degradation in La 0.58 Sr 0.4 Fe 0.5 Co 0.5 O 3−x after long-term operation in solid oxide electrolysis cells
A Mössbauer spectral study of degradation in La 0.58 Sr 0.4 Fe 0.5 Co 0.5 O 3−x after long-term operation in solid oxide electrolysis cells
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 analyze...
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Personal Name(s): | Mahmoud, Abdelfattah |
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Al Daroukh, Mahmoud / Lipinska-Chwalek, Marta / Luysberg, Martina / Tietz, Frank / Hermann, Raphael P. (Corresponding author) | |
Contributing Institute: |
Streumethoden; JCNS-2 Materialwissenschaft u. Werkstofftechnik; ER-C-2 Physik Nanoskaliger Systeme; ER-C-1 Werkstoffsynthese und Herstellungsverfahren; IEK-1 JARA-FIT; JARA-FIT Streumethoden; PGI-4 |
Published in: | Solid state ionics, 312 (2017) S. 38 - 43 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2017
|
DOI: |
10.1016/j.ssi.2017.10.003 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) Materials and Processes for Energy and Transport Technologies Quantum Condensed Matter: Magnetism, Superconductivity Controlling Collective States Controlling Collective States |
Publikationsportal JuSER |
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245 | |a A Mössbauer spectral study of degradation in La 0.58 Sr 0.4 Fe 0.5 Co 0.5 O 3−x after long-term operation in solid oxide electrolysis cells | ||
260 | |a Amsterdam [u.a.] |c 2017 |b Elsevier Science | ||
520 | |a 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. | ||
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