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Characterization of Sm and Nd Co-Doped Ceria-Based Electrolyte Materials

100%

Arabacı A., Serin Ö., Sarıboğa V., Öksüzömer M.

Acta Physica Polonica A

2016

vol. 129

issue 4

524-527

Ceria doped with trivalent cations, such as rare earth elements, is considered to be one of the most promising electrolyte materials for intermediate-temperature solid oxide fuel cells, which are an alternative to the commercially used ytrium-stabilized zirconia (YSZ). The aim of this work research is to synthesize Sm and Nd co-doped ceria materials using the Pechini method as solid electrolyte for intermediate temperature solid oxide fuel cell. Ce_{0.75}Sm_{0.20}Nd_{0.05}O_{1.875}, Ce_{0.65}Sm_{0.20}Nd_{0.15}O_{1.825}, and Ce_{0.60}Sm_{0.20}Nd_{0.20}O_{1.80} have been chosen as target of this study. Microstructural and physical properties of the samples were characterized with X-ray diffraction, scanning electron microscopy, thermogravimetric analysis methods. The results of the thermogravimetry/differential thermal analysis and X-ray diffraction indicated that a single-phase fluorite structure formed at the relatively low calcination temperature of 600°C for 3 h. The two-probe ac impedance spectroscopy was used to study the total ionic conductivity of doped and co-doped ceria ceramics at 800°C. The Ce_{0.60}Sm_{0.20}Nd_{0.20}O_{1.80} sample showed maximum ionic conductivity.

Characterization of Nd and Sm Co-Doped CeO₂-Based Systems

100%

Arabacı A., Der M., Öksüzömer M., Altınçekiç T.

Acta Physica Polonica A

2017

vol. 131

issue 1

78-81

Nd_{0.20}Sm_{x}Ce_{0.8-x}O_{1.9-x/2} (x=0, 0.05, 0.10, 0.15, 0.20) rare-earth-co-doped ceria electrolytes were synthesized by polyol process. Acetate compounds of cerium and dopants (Nd, Sm) were used as starting materials and triethylene glycol was used as a solvent. Structural and ionic conductivity properties of the electrolyte systems were determined by applying characterization techniques such as X-ray diffraction, the Fourier transform infrared spectroscopy, scanning electron microscope, and electrochemical impedance spectroscopy. The results of X-ray diffraction indicated that a single-phase fluorite structure formed at the relatively low calcination temperature of 600°C. So, the samples were calcined at 600°C for 4 h and then sintered at 1400°C for 6 h to obtain dense ceramics (between 85 and 90%). The two-probe ac impedance spectroscopy was used to study the total ionic conductivity of doped and co-doped ceria samples. The results of the impedance spectroscopy indicate that the Nd_{0.20}Sm_{0.05}Ce_{0.75}O_{1.875} composition exhibited highest ionic conductivity value, 3.60×10¯² S cm¯¹ at 800°C.

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2 Acta Physica Polonica A

1 2017

1 2016

2 Arabacı A.

2 Öksüzömer M.

1 Altınçekiç T.

1 Der M.

1 Sarıboğa V.

1 Serin Ö.

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Characterization of Sm and Nd Co-Doped Ceria-Based Electrolyte Materials

Characterization of Nd and Sm Co-Doped CeO₂-Based Systems