Ba0.5Sr0.5Co0.8Fe0.2-SDC Carbonate Composite Cathode for Low-Temperature SOFCs

Linda Agun; Mohamed Hakim Ahmad Shah; Sufizar Ahmad; Hamimah Abdul Rahman

doi:10.4028/www.scientific.net/MSF.840.247

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HomeMaterials Science ForumMaterials Science Forum Vol. 840Ba0.5Sr0.5Co0.8Fe0.2-SDC Carbonate Composite...

Ba₀.₅Sr₀.₅Co₀.₈Fe₀.₂-SDC Carbonate Composite Cathode for Low-Temperature SOFCs

Abstract:

The composite cathode Ba₀.₅Sr₀.₅Co_0.8Fe_0.2(BSCF)–samarium-doped ceria carbonate (SDCc) was reviewed based on different (Li/Na)₂ carbonate molarities (67:33, 62:38, and 53:47 (mol.%)). Effects of (Li/Na)₂ carbonate on BSCF was studied in terms of chemical, thermal, and physical properties. Composite-cathode powders were prepared using high-energy ball milling (HEBM) and calcined at 750 °C for 2 h before uniaxial pressing to form a pellets. Afterwards, the pellets were sintered at 600 °C for 90 min to obtain porous composite-cathode pellets. Powders behaviors were examined based on particle size and thermal expansion by using Image J software, field-emission scanning electron microscopy (FESEM) and dilatometry respectively. Cross-section morphology of the pellets were characterised by FESEM to examine grain positions and by the Archimedes principle to identify the porosity, respectively. The quantitative elements for the BSCF-SDCc pellet were identified using energy-dispersive spectroscopy (EDS). HEBM enabled the cathode to achieve a nanocomposite state. Cathode cells obtained became porous when porosity values were between 26% and 30%. These results showed that BSCF–SDCc has high potential for low-temperature solid oxide fuel cell (LT-SOFC) applications.

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Periodical:

Materials Science Forum (Volume 840)

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247-251

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https://doi.org/10.4028/www.scientific.net/MSF.840.247

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Online since:

January 2016

Authors:

Linda Agun, Mohamed Hakim Ahmad Shah, Sufizar Ahmad, Hamimah Abdul Rahman*

Keywords:

Binary Carbonate, Composite Cathode, Low-Temperature SOFC

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