Ultrasound assisted synthesis of Gd and Nd doped ceria electrolyte for solid oxide fuel cells

Okkay, Hikmet; Öksüzömer, M.A. Faruk

doi:10.1016/j.ceramint.2012.12.021

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…Transition metals and/or lanthanum group elements with low oxidation state are added to prevent reduction and increase ion conductivity [8][9][10][11][12]. This doping is obtained by sol-gel, hydrothermal, solid state, ultrasound and co-precipitation methods [13,14]. Samarium (Sm), magnesium (Mg), calcium (Ca), barium (Ba), dysprosium (Dy), copper (Cu), erbium (Er), gadolinium (Gd), praseodymium (Pr) etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes

Kırkgeçit

Torun

2020

PAC

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In this study, pure CeO2 and Ce0.85La0.10M0.05O2 (M: Sm3+, Gd3+, Dy3+) solid electrolytes were synthesized using the sol-gel method and sintered at 1350?C for 12 h. X-ray diffraction (XRD) was used for crystal structure characterization of the ceramic solid electrolytes. After sintering, all prepared solid electrolytes were indexed to be cubic crystal lattices. The thermal properties of the prepared samples were investigated by thermogravimetric (TG) and differential thermal analysis (DTA) methods. The surface properties of the grain structure of the ceramic solid electrolytes were evaluated by scanning electron microscopy (FE-SEM) confirming the average grain size of about 1 ?m. The electrochemical impedance spectroscopy technique was used to investigate AC electrical properties of prepared solid electrolytes. The conductivity values at 750?C of the Ce0.85La0.10Sm0.05O2, Ce0.85La0.10Gd0.05O2 and Ce0.85La0.10Dy0.05O2 and pure CeO2 were found to be 1.10 ? 10?3 S/cm, 3.05 ? 10?4 S/cm, 8.85 ? 10?4 S/cm and 8.44 ? 10?10 S/cm, respectively. The characterization results showed that the La-Sm co-doped CeO2 sample can be used as a ceramic electrolyte in intermediate temperature solid oxide fuel cells (IT-SOFC).

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes

Kırkgeçit

Torun

2020

PAC

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“…It must be noted that Dimri et al observed an increase of the magnetization M not only for Sm doped, but also for Nd doped CeO 2 NPs, whereas for example many authors reported an increase of the lattice parameters in Nd doped CeO 2 NPs. From our model comparing the radii of the doping and host ions we would observe a decrease of M in disagreement with Dimri et al Increasing of the lattice parameters is obtained also in Nd doped SnO 2 NPs by Maik et al…”

Section: Numerical Results and Discussionmentioning

confidence: 94%

Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Apostolov

Apostolova

Wesselinowa

2018

Physica Status Solidi (b)

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The magnetic properties of rare earth doped SnO 2 , TiO 2 , and CeO 2 nanoparticles are studied theoretically. The discrepancies in the literature for some doping cases are explained, for example, the lattice parameters and the magnetization in Pr and Sm doped CeO 2 nanoparticles. There is a strong connection between the lattice deformations and the magnetization M. M decreases (except for Y doped CeO 2 ) due to the larger radius of the rare earth ions compared to that of the host ions which leads to increase of the lattice parameters and decrease of the exchange interactions. The decrease of M is due also to the enhanced number of oxygen vacancies with increasing dopant concentration. For Y doping the lattice parameters decrease and M increases with increasing Y concentration. We have discussed the origin of the different behavior of M in rare earth doped nanoparticles.

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“…The formation and collapse of these bubbles increase the temperature (5000 °C) and pressure (1000 atm) with fast heating and cooling rates (10 °C s –1 ) in the vicinity of these bubbles, which induces immense stress on the liquid. This stress is enough to break the agglomerates into smaller fragments and prevent nucleation . Thus, with the assistance of ultrasonication, particle agglomeration can be prevented, and uniform particle distribution can be achieved. − This technique has been used for the synthesis of SOFC components such as the YSZ electrolyte, GDC electrolyte, ,, NiO/GDC anode, cathodes such as SSC (Sm x Sr 1– x CoO 3 )/GDC, and LSC(La 0.6 Sr 0.4 CoO 3 )/SDC(Sm 2 O 3 -doped CeO 2 ) .…”

Section: Introductionmentioning

confidence: 99%

“…This stress is enough to break the agglomerates into smaller fragments and prevent nucleation . Thus, with the assistance of ultrasonication, particle agglomeration can be prevented, and uniform particle distribution can be achieved. − This technique has been used for the synthesis of SOFC components such as the YSZ electrolyte, GDC electrolyte, ,, NiO/GDC anode, cathodes such as SSC (Sm x Sr 1– x CoO 3 )/GDC, and LSC(La 0.6 Sr 0.4 CoO 3 )/SDC(Sm 2 O 3 -doped CeO 2 ) . The use of sonication resulted in better dispersion of particles within the solution.…”

Section: Introductionmentioning

confidence: 99%

Effect of Intrinsic and Extrinsic Oxygen Vacancies on the Conductivity of Gd-Doped CeO₂ Synthesized by a Sonochemical Route

2022

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The present study reports the effect of a dopant (gadolinium, Gd) on the grain size, generation of oxygen vacancies, and conductivity in ceria. Undoped and doped ceria (Ce 1−x Gd x O 2−δ , x = 0, 0.10, 0.20, and 0.30) are synthesized by the ultrasound-assisted sol−gel combustion method, followed by sintering at 1450 °C for 4 h. X-ray diffraction studies confirm the formation of the cubic fluorite phase. The lattice parameter variation confirms that the solid solubility limit of present samples lies between x = 0.20 and x = 0.30. The crystallite size of the powders ranges between 5 and 30 nm. The morphology of sintered materials is studied using scanning electron microscopy. Raman spectroscopy is used to investigate the presence of different structural defects and oxygen vacancies in undoped and Gd-doped ceria (CeO 2 ) samples. It also helped to detect the secondary phase formed in the GDC-30 sample. Ce 0.9 Gd 0.1 O 2−δ with a uniform, dense morphology and the presence of oxygen vacancies has the highest electrical conductivity (1.67 × 10 −2 S cm −1 at 600 °C). It could be a suitable material for electrolytes in solid-oxide fuel cells.

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Ultrasound assisted synthesis of Gd and Nd doped ceria electrolyte for solid oxide fuel cells

Cited by 10 publications

References 26 publications

Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes

Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes

Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Effect of Intrinsic and Extrinsic Oxygen Vacancies on the Conductivity of Gd-Doped CeO₂ Synthesized by a Sonochemical Route

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Ultrasound assisted synthesis of Gd and Nd doped ceria electrolyte for solid oxide fuel cells

Cited by 10 publications

References 26 publications

Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes

Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes

Magnetic Properties of Rare Earth Doped SnO2, TiO2 and CeO2 Nanoparticles

Effect of Intrinsic and Extrinsic Oxygen Vacancies on the Conductivity of Gd-Doped CeO2 Synthesized by a Sonochemical Route

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Product

Resources

About

Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Effect of Intrinsic and Extrinsic Oxygen Vacancies on the Conductivity of Gd-Doped CeO₂ Synthesized by a Sonochemical Route