Facilitating oxygen reduction by silver nanoparticles on lanthanum strontium ferrite cathode
| Autor: | Kjeld Bøhm Andersen, Rokas Sažinas, Kent Kammer Hansen |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope Oxide Sintering chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Silver nanoparticle Cathode 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering law Lanthanum General Materials Science Calcination Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Solid State Electrochemistry. 24:609-621 |
| ISSN: | 1433-0768 1432-8488 |
| Popis: | Single-phase silver (Ag)-doped La0.85-xSr0.15AgxFeO3-δ (x = 0–0.05) materials (LSAF) were synthesized by wet synthesis route and calcined at 800 °C in air. The materials exhibited no thermal degradation in Ar and synthetic air below sintering temperature at 1200 °C of the cathode for solid oxide fuel cells. Exsolution of Ag nanoparticles from the perovskite lattice at 420 °C in reducing 5% H2/N2 was investigated, and electrocatalytic activity of the cathodes towards oxygen reduction reaction for solid oxide fuel cells was demonstrated. Scanning electron microscopy confirmed exsolution of Ag nanoparticles with increased effective surface area, and the particles were distributed with a good contact on the surface of the perovskite. Electrochemical performance of novel materials was tested and compared. Enhanced cathode with Ag nanoparticles revealed the area specific resistance of 0.23 and 0.15 Ω cm2 at 800 °C in 20% O2/N2 before and after Ag exsolution, respectively. The area specific resistance of the cathode decreased with Ag exsolution, operation temperature, and increasing oxygen partial pressure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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