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High performance of SDC and GDC core shell type composite electrolytes using methane as a fuel for low temperature SOFC
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Nanocomposites Samariumdoped Ceria (SDC), Gadolinium doped Ceria (GDC), core shell SDC amorphous Na2CO3 (SDCC) and GDC amorphous Na2CO3 (GDCC) were synthesized using co-precipitation method and then compared to obtain better solid oxide electrolytesmaterials for low temperature Solid Oxide Fuel Cell(SOFCs). The comparison is done in terms of structure, crystallanity, thermal stability, conductivity and cell performance. In present work, XRD analysis confirmed proper doping of Sm and Gd in both single phase (SDC, GDC) and dual phase core shell (SDCC, GDCC) electrolytematerials. EDX analysis validated the presence of Sm and Gd in both single and dual phase electrolytematerials; also confirming the presence of amorphous Na2CO3 in SDCC and GDCC. From TGA analysis a steep weight loss is observed in case of SDCC and GDCC when temperature rises above 725 °C while SDC and GDC do not show any loss. The ionic conductivity and cell performance of single phase SDC and GDC nanocomposite were compared with core shell GDC/amorphous Na2CO3 and SDC/ amorphous Na2CO3 nanocomposites using methane fuel. It is observed that dual phase core shell electrolytesmaterials (SDCC, GDCC) show better performance in low temperature range than their corresponding single phase electrolytematerials (SDC, GDC) with methane fuel.
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