SYNTHESIS AND IONIC CONDUCTION OF CA0.05SM0.2CE0.75O1.9-δ - (LI,NA)2CO3 NANOCOMPOSITE AS AN ELECTROLYTE FOR LOW-TEMPERATURE SOLID OXIDE FUEL CELL

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SAMADI H.; TAVASOLI N.; NEMATI A.

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Journal: CERAMIC SCIENCE & ENGINEERING Year:2016 | Volume:5 | Issue:1 Page(s): 1-14

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Title

SYNTHESIS AND IONIC CONDUCTION OF CA0.05SM0.2CE0.75O1.9-δ - (LI,NA)2CO3 NANOCOMPOSITE AS AN ELECTROLYTE FOR LOW-TEMPERATURE SOLID OXIDE FUEL CELL

Author(s)

SAMADI H. | TAVASOLI N. | NEMATI A. | Issue Writer Certificate

Keywords

SOFCQ2

ELECTROLYTEQ2

NANOCOMPOSITEQ2

DOPED CERIAQ2

Abstract

One of drawbacks of solid oxide fuel cells (SOFCs) is high temperature ionic conductivity of their ELECTROLYTEs. Several researches have been done to find a solution to overcome the problem. One method is to incorporate co-doped cerium oxide (Ceria) with metal salts such as carbonates. In the present work, nanopowders of calcium and samarium co-doped cerium oxide of Ca0.05Sm0.2-xCe0.75O1.9-d (CSDC 5) were prepared using citrate-nitrate auto combustion method. Phases and crystallite size of the sample were determined by X-ray diffraction (XRD). Field emission scanning electron microscope (FE-SEM) was used for morphological studies. The XRD pattern showed that a single-phase solid solution of calcium and samarium co-doped ceria was obtained. The crystallite size of the particles was 19 nm in diameter as calculated from data obtained through XRD result of (111) peak. FE-SEM images depicted that synthesized CSDC 5 powders were sphere-like and approximately 20 nm in size. Also, it was shown that the sintered CSDC 5 had a dense microstructure. The ionic conductivities of all samples were determined by AC impedance spectroscopy (EIS) in temperature range of 250 – 650ºC. EIS results demonstrated that Ca0.05Sm0.2Ce0.75O1.9- d had total conductivity of 0.015 S.cm-1 at 650 ºC. CSDC 5 – (Li, Na) 2CO3 (CSDC 5 – LN) NANOCOMPOSITE ELECTROLYTE was synthesized by mixing the lithium and sodium carbonates with CSDC 5 nanopowders. XRD pattern of the composite sample was similar to the patterns of ceria and CSDC 5 which indicates that the carbonate phase was probably amorphous. TG/DTA thermal analysis results demonstrated that the carbonate phase was remained and undecomposed up to temperature of 730ºC. FE-SEM images of the composite powders depicted that CSDC 5 powders were covered by carbonate phase. In addition, the sintered composite showed a porous microstructure using FE-SEM. EIS data proved that above the temperature of 500ºC, total ionic conductivity of CSDC 5 – LN was 0.073 S.cm-1 which was nearly 5 times higher than that of CSDC 5. This implied that using carbonate phase would increase the total ionic conductivity due to multiple ions of Na+, Li+, and CO2-3 would be involved in ionic conduction at the mentioned temperature range. This makes it a serious candidate as ELECTROLYTE material for low temperature solid oxide fuel cell (LT-SOFC).

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APA: Copy

SAMADI, H., TAVASOLI, N., & NEMATI, A.. (2016). SYNTHESIS AND IONIC CONDUCTION OF CA0.05SM0.2CE0.75O1.9-δ - (LI,NA)2CO3 NANOCOMPOSITE AS AN ELECTROLYTE FOR LOW-TEMPERATURE SOLID OXIDE FUEL CELL. CERAMIC SCIENCE & ENGINEERING, 5(1), 1-14. SID. https://sid.ir/paper/227928/en

Vancouver: Copy

SAMADI H., TAVASOLI N., NEMATI A.. SYNTHESIS AND IONIC CONDUCTION OF CA0.05SM0.2CE0.75O1.9-δ - (LI,NA)2CO3 NANOCOMPOSITE AS AN ELECTROLYTE FOR LOW-TEMPERATURE SOLID OXIDE FUEL CELL. CERAMIC SCIENCE & ENGINEERING[Internet]. 2016;5(1):1-14. Available from: https://sid.ir/paper/227928/en

IEEE: Copy

H. SAMADI, N. TAVASOLI, and A. NEMATI, “SYNTHESIS AND IONIC CONDUCTION OF CA0.05SM0.2CE0.75O1.9-δ - (LI,NA)2CO3 NANOCOMPOSITE AS AN ELECTROLYTE FOR LOW-TEMPERATURE SOLID OXIDE FUEL CELL,” CERAMIC SCIENCE & ENGINEERING, vol. 5, no. 1, pp. 1–14, 2016, [Online]. Available: https://sid.ir/paper/227928/en

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