Thermal stability study of SDC/Na2CO3 nanocomposite electrolyte for low-temperature SOFCs |
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Authors: | Ying Ma Xiaodi Wang Rizwan Raza Mamoun Muhammed Bin Zhu |
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Affiliation: | 1. Division of Functional Materials, Royal Institute of Technology (KTH), S-16440 Stockholm, Sweden;2. College of Material Science and Chemical Engineering, Harbin Engineering University, 150001 Harbin, PR China;3. Department of Energy Technology, Royal Institute of Technology (KTH), S-10044 Stockholm, Sweden |
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Abstract: | The novel core–shell nanostructured SDC/Na2CO3 composite has been demonstrated as a promising electrolyte material for low-temperature SOFCs. However, as a nanostructured material, stability might be doubted under elevated temperature due to their high surface energy. So in order to study the thermal stability of SDC/Na2CO3 nanocomposite, XRD, BET, SEM and TGA characterizations were carried on after annealing samples at various temperatures. Crystallite sizes, BET surface areas, and SEM results indicated that the SDC/Na2CO3 nanocomposite possesses better thermal stability on nanostructure than pure SDC till 700 °C. TGA analysis verified that Na2CO3 phase exists steadily in the SDC/Na2CO3 composite. The performance and durability of SOFCs based on SDC/Na2CO3 electrolyte were also investigated. The cell delivered a maximum power density of 0.78 W cm−2 at 550 °C and a steady output of about 0.62 W cm−2 over 12 h operation. The high performances together with notable thermal stability make the SDC/Na2CO3 nanocomposite as a potential electrolyte material for long-term SOFCs that operate at 500–600 °C. |
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Keywords: | Ce0.8Sm0.2O1.9 (SDC) Composite electrolyte Thermal stability Solid oxide fuel cells (SOFCs) |
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