Szczegóły publikacji
Opis bibliograficzny
An innovative approach to design SOFC air electrode materials: high entropy $La_{1-x}Sr_{x}(Co,Cr,Fe,Mn,Ni)O_{3-\delta}(x=0, 0.1, 0.2, 0.3)$ perovskites synthesized by the sol-gel method / Juliusz DĄBROWA, Anna OLSZEWSKA, Andreas Falkenstein, Christian Schwab, Maria Szymczak, Marek ZAJUSZ, Maciej MOŹDZIERZ, Andrzej MIKUŁA, Klaudia Zielińska, Katarzyna BERENT, Tomasz Czeppe, Manfred Martin, Konrad ŚWIERCZEK // Journal of Materials Chemistry. A ; ISSN 2050-7488. — 2020 — vol. 8 iss. 46, s. 24455–24468. — Bibliogr. s. 24467–24468. — Publikacja dostępna online od: 2020-12-14. — K. Świerczek – dod. afiliacja: AGH Centre of Energy
Autorzy (13)
- AGHDąbrowa Juliusz
- AGHStępień Anna
- Falkenstein Andreas
- Schwab Christian
- AGHSzum Maria
- AGHZajusz Marek
- AGHMoździerz Maciej
- AGHMikuła Andrzej
- AGHZielińska Klaudia
- AGHBerent Katarzyna
- Czeppe Tomasz
- Martin Manfred
- AGHŚwierczek Konrad
Dane bibliometryczne
| ID BaDAP | 131497 |
|---|---|
| Data dodania do BaDAP | 2020-12-17 |
| Tekst źródłowy | URL |
| DOI | 10.1039/d0ta06356h |
| Rok publikacji | 2020 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Materials Chemistry, A |
Abstract
Among the for the first time reported Cr-containing high entropy La1-xSrx(Co,Cr,Fe,Mn,Ni)O3-δ (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) perovskite-type oxides, the selected Sr-doped La0.7Sr0.3(Co,Cr,Fe,Mn,Ni)O3-δ material is documented to possess attractive properties as a candidate air electrode material for Solid Oxide Fuel Cells (SOFCs). Nanosized powders of the considered oxides are obtained using a modified Pechini sol-gel method. In the formed solid solution with a simple perovskite structure the strontium solubility limit is found to be at least x = 0.3. Room temperature (RT) structural data indicate the presence of rhombohedral structural distortion (R3c symmetry) in the materials. High-temperature structural studies for the selected La0.7Sr0.3(Co,Cr,Fe,Mn,Ni)O3-δ indicate the occurrence of a phase transition to an aristotype Pm3m structure at ca. 800 °C. The linear thermal expansion coefficient in the RT-1000 °C range is found to be moderate, 16.0(3) × 10-6 K-1. The results of impedance spectroscopy measurements support the semiconducting-type behavior of the electrical conductivity for all single-phase materials, in a temperature range of RT-1000 °C. The maximum recorded conductivity for the La0.7Sr0.3(Co,Cr,Fe,Mn,Ni)O3-δ composition exceeds 16 S cm-1 in the 900-1000 °C range, being suitable for application. Furthermore, chemical stability toward the La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM) electrolyte is proven. Considering the presence of chromium, typically deleterious to the performance, the measured value of the total cathodic polarization resistance for the La0.7Sr0.3(Co,Cr,Fe,Mn,Ni)O3-δ-based electrode, being 0.126 Ω cm-2 at 900 °C, seems to be very attractive. The results obtained for a button-type fuel cell indicate power densities at a level of 550 mW cm-2 at 900 °C. Therefore, it can be considered that the high entropy-based approach enables to propose alternative SOFC air electrode materials, with otherwise inaccessible chemical compositions. This journal is © The Royal Society of Chemistry.
