Fabrication of LSCF and LSCF-GDC nanocomposite thin films using polymeric precursors
| Autor: | Ali Şems Ahsen, Osman Ozturk, Viola I. Birss, Sedat Akkurt, Aligul Buyukaksoy, Can Sındıraç |
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| Rok vydání: | 2019 |
| Předmět: |
Fabrication
Materials science Annealing (metallurgy) General Chemical Engineering Composite number General Engineering General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Dielectric spectroscopy law.invention Chemical engineering law Electrode General Materials Science Solid oxide fuel cell 0210 nano-technology |
| Zdroj: | Ionics. 26:913-925 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-019-03262-4 |
| Popis: | 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 °C, respectively. For LSCF, electrochemical impedance spectroscopy measurements indicate very low electrode polarization resistances of ca. 0.6 Ω cm2 per electrode at 600 °C. However, the addition of GDC results in poorer electrochemical activity but better microstructural and electrochemical stability, all at 600 °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. |
| Databáze: | OpenAIRE |
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