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Title: Fabrication of LSCF and LSCF-GDC nanocomposite thin films using polymeric precursors
Authors: Sındıraç, Can
Ahsen, Ali
Öztürk, Osman
Akkurt, Sedat
Birss, Viola, I
Büyükaksoy, Aligül
Keywords: Solid oxide fuel cell
Thin-film electrodes
Impedance spectroscopy
Long-term stability
Surface composition
Issue Date: 2020
Publisher: Institute for Ionics
Abstract: La1-xSrxCoyFe1-yO3 (LSCF) and LSCF-gadolinia-doped ceria (LSCF-GDC) composites are used as solid oxide fuel cell (SOFC) cathodes. In the present study, to maximize the LSCF/gas and LSCF/GDC interfacial area and thus enhance the performance, we fabricated both single-phase LSCF and composite LSCF-GDC thin-film electrodes using a facile and cost-effective polymeric precursor technique. This method involves molecular level mixing of cations in solution form and results in average particle sizes of ca. 72 nm and 60 nm upon annealing at 700 degrees C, respectively. For LSCF, electrochemical impedance spectroscopy measurements indicate very low electrode polarization resistances of ca. 0.6 omega cm(2) per electrode at 600 degrees C. However, the addition of GDC results in poorer electrochemical activity but better microstructural and electrochemical stability, all at 600 degrees C. Surface analysis revealed that Fe surface segregation occurs in the single-phase LSCF, while predominantly Co segregation is observed at the LSCF-GDC composite electrode surface.
Description: Buyukaksoy, Aligul/0000-0003-2227-8938; SINDIRAC, CAN/0000-0002-9935-1331
WOS: 000493636500001
ISSN: 0947-7047
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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