Effects of binary (Lithium/Natrium)2 carbonates on the phase and microstructural stability of Lscf-Sdc for low temperature solid oxide fuel cells
Most studies focus on introducing of doped ceria carbonate into cathode materials to enhance the cathode ionic conductivity for low temperature solid oxide fuel cell. In this work, we aim to identify the influence of Lithium/Natrium binaries (Li/Na)2 carbonates addition on Lanthanum Strontium Ca...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit Universiti Kebangsaan Malaysia
2020
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| Online Access: | http://journalarticle.ukm.my/16180/ http://journalarticle.ukm.my/16180/1/27.pdf |
| Summary: | Most studies focus on introducing of doped ceria carbonate into cathode materials to enhance the cathode ionic
conductivity for low temperature solid oxide fuel cell. In this work, we aim to identify the influence of Lithium/Natrium
binaries (Li/Na)2
carbonates addition on Lanthanum Strontium Carbonate Ferrite-Samarium-Doped Ceria (LSCF-SDC)
composite cathode on the phase and microstructural stability under long-term durability of 1000 h. Three different
binaries (Li/Na)2
carbonate of 67:33, 62:38, and 53:47 mol.% were incorporated into LSCF-SDC via high energy ball
milling method. The phase and microstructural stability as a function of operating temperature (400 and 600 °C) were
studied using X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). Archimedes principle
was applied to evaluate the porosity of the cathode pellets. Electrochemical impedance spectroscopy measurements
were performed by using impedance setup at 600 °C under open-circuit condition. The XRD findings demonstrated that
cathodes able to retain their chemical phases after stability test. Qualitative results show that the cathode morphology
exhibits a slight increment on the particle size after the ageing process at 1000 h. All cathodes prepared at various
binary carbonate ratio still maintain their porosity values between 26 and 32% after long-term stability test. This
finding has yielded a smaller area specific resistance of 0.66 Ω.cm2
at 600 °C. Therefore, incorporating binary (Li/
Na)2
carbonate in LSCF-SDC shows a good combination when insignificant changes observed after long-term stability
test of 1000 h. |
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