Processing and characterization of CoO and Sm2O3 codoped ceria solid solution electrolyte

Yao, Hong-Chang; Zhao, Xuechao; Chen, Xing; Wang, Jichao; Ge, Qian‐Qing; Wang, Jianshe; Li, Zhongjun

doi:10.1016/j.jpowsour.2012.01.076

Cited by 21 publications

(7 citation statements)

References 48 publications

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“…128 Yao et al investigated the codoping of Co and Sm in CeO 2 and observed no secondary CoO or Co 3 O 4 phases. 77 Combined with the observed Vegard law behavior for Co doping, they concluded that the Co ions are incorporated into the ceria lattice forming a solid solution. This seems to indicate that the codoping with Sm in this case stabilizes the Co dopants somewhat, which is not unreasonable based on the Sm defect formation energy given in Table 3.…”

Section: Defect Formation Energiesmentioning

confidence: 88%

“…54 The 77 The smaller experimental lattice contraction is mainly due to the presence of oxygen vacancies. As will be shown in Sec.…”

Section: Aliovalent Dopants Without Compensating Oxygen Vacanciesmentioning

confidence: 98%

“…78,79 contraction, in qualitative agreement with our theoretical results. 77 The smaller experimental lattice contraction is mainly due to the presence of oxygen vacancies. As will be shown in Section 4.2.2, oxygen vacancies give rise to a lattice expansion relative to a system without oxygen vacancies.…”

Section: Aliovalent Dopants Without Compensating Oxygen Vacanciesmentioning

confidence: 99%

“…In addition, Yao et al also observed the grain boundary conductivity to show a maximum at 5% of Co doping. 77 They linked this to the segregation of Co to the grain boundary, showing that the Sm dopants can only stabilize a limited amount of Co.…”

Section: Defect Formation Energiesmentioning

confidence: 99%

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Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

et al. 2014

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The modification of CeO 2 properties by means of aliovalent doping is investigated within the ab-initio density functional theory framework. Lattice parameters, dopant atomic radii, bulk moduli and thermal expansion coefficients of fluorite type Ce 1−x M x O 2−y (with M= Mg, V, Co, Cu, Zn, Nb, Ba, La, Sm, Gd, Yb, and Bi) are presented for 0.00 ≤ x ≤ 0.25. The relative stability of the dopants is discussed, and the influence of oxygen vacancies is investigated. It is shown that oxygen vacancies tend to increase the lattice parameter, and strongly decrease the bulk modulus. Defect formation energies are correlated with calculated crystal radii and covalent radii of the dopants, and are shown to present no simple trend. The previously observed inverse relation between the thermal expansion coefficient and the bulk modulus [J. Am. Ceram. Soc. 97(1), 258 (2014)] is shown to persist independent of the inclusion of charge compensating vacancies.

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Section: Defect Formation Energiesmentioning

confidence: 88%

“…54 The 77 The smaller experimental lattice contraction is mainly due to the presence of oxygen vacancies. As will be shown in Sec.…”

Section: Aliovalent Dopants Without Compensating Oxygen Vacanciesmentioning

confidence: 98%

Section: Aliovalent Dopants Without Compensating Oxygen Vacanciesmentioning

confidence: 99%

Section: Defect Formation Energiesmentioning

confidence: 99%

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Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

et al. 2014

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“…The tolerance factor was also used to estimate the symmetry of the perovskite structure as shown in Equation 27 The crystallite sizes for the composites with y = 0.03 were calculated to be 21.80 nm, 20.41 nm and 18.45 nm for the samples calcined at 1000°C, 900°C and 800°C, respectively. The composites with the y = 0.04 composition had crystallite sizes of 22.32 nm, 21.09 nm, and 14.92 nm for the samples calcined at 1000°C, 900°C and 800°C.…”

Section: Powder X-ray Diffraction Analysismentioning

confidence: 99%

Physical chemical properties of Ce08Sm02IryCo1-yO3-ô (y = 0.03-0.04) and preliminary testing as cathode material for low-temperature SOFC

2017

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Sol-gel method was used to prepare Ce 0.8 Sm 0.2 Ir y Co 1-y O 3-ä (CSIC) (y = 0.03 and 0.04). All materials were characterized using powder X-ray powder diffraction (XRD), Raman spectroscopy, infrared (IR) spectroscopy, high resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM). The materials were then tested as cathodes in solid oxide fuel cell (SOFC). The XRD data showed distinct peaks for samarium-doped ceria and iridium oxide while Raman data confirmed the presence of perovskite and pyrochlore phases. Materials calcined at 1000°C had the highest power density of 0.287 W cm -2 and 0.222 W cm -2 at 500 °C for the materials with y = 0.03 and 0.04, respectively, when tested in SOFC button cells. KEYWORDSSolid oxide fuel cell, iridium oxide, samarium-doped ceria, oxides, sol-gel chemistry, Raman spectroscopy, X-ray diffraction, electrochemical properties. Experimental Methods Material SynthesisCobalt (II) acetylacetonate hydrate, (99 % purity), samarium (III) acetylacetonate hydrate (99.9 %), cerium (III) acetylacetonate hydrate, (99.9 % purity), and pluronic F-127 were purchased from Sigma-Aldrich (Pty) Ltd, South Africa. Iridium (III) acetylacetonate hydrate (98 % purity) was purchased from Alfa

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Ceria-based electrolytes with high surface area and improved conductivity for intermediate temperature solid oxide fuel cells

Ramos-Alvarez¹,

Villafuerte‐Castrejon²,

González³

et al. 2016

J Mater Sci

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Processing and characterization of CoO and Sm2O3 codoped ceria solid solution electrolyte

Cited by 21 publications

References 48 publications

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

Physical chemical properties of Ce08Sm02IryCo1-yO3-ô (y = 0.03-0.04) and preliminary testing as cathode material for low-temperature SOFC

Ceria-based electrolytes with high surface area and improved conductivity for intermediate temperature solid oxide fuel cells

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Processing and characterization of CoO and Sm2O3 codoped ceria solid solution electrolyte

Cited by 21 publications

References 48 publications

Aliovalent doping of CeO2: DFT study of oxidation state and vacancy effects

Aliovalent doping of CeO2: DFT study of oxidation state and vacancy effects

Physical chemical properties of Ce08Sm02IryCo1-yO3-ô (y = 0.03-0.04) and preliminary testing as cathode material for low-temperature SOFC

Ceria-based electrolytes with high surface area and improved conductivity for intermediate temperature solid oxide fuel cells

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Product

Resources

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Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects

Aliovalent doping of CeO₂: DFT study of oxidation state and vacancy effects