A study of oxygen ion conductivity in doped non-stoichiometric oxides

Kilner, John A.; Brook, R. J.

doi:10.1016/0167-2738(82)90045-5

Cited by 458 publications

(262 citation statements)

References 16 publications

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“…The doped ceria has enhanced electrical properties depending on various factors such as particle size, structural characteristics, morphology, etc. [4]. Ceria-based solid solutions have been widely identified as novel electrolytes for intermediate temperature solid oxide fuel cells (SOFC) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Priya

Sandhya

Rajendran

2018

Electrochemical Energy Technology

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Ce 0.8 Gd 0.2 O 2−δ (GDC) and Ce 0.8 Sm 0.2 O 2−δ (SDC) nanocrystalline materials are prepared by a solid state reaction method. The synthesized nano crystalline solid solutions have cubic fluorite structure as evident from XRD patterns. The materials are qualitatively analyzed by FTIR. The morphology, size and shape of grains etc. are identified from the SEM images. The grain size of GDC is smaller than that of SDC. The better morphology is obtained for GDC. Hence, this is electrically characterized. The activation energy is calculated from the slope of Arrhenius plot (showing variation of conductivity with temperature).

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Section: Introductionmentioning

confidence: 99%

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Priya

Sandhya

Rajendran

2018

Electrochemical Energy Technology

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“…Y 2 O 3 , Gd 2 O 3 , and Sm 2 O 3 are the usual dopants, which can significantly enhance the ionic conductivity of ceria [6]. Gadolinia-doped ceria (GDC) has given much attention because of its great potential application as the electrolyte in intermediate tem-perature SOFCs [7] The addition of gadolinia into ceria can be written in Kroger-Vink notation [8] as:…”

Section: Introductionmentioning

confidence: 99%

Microstructural studies of bulk and thin film GDC

Muthukkumaran

Kuppusami

Kesavamoorthy

et al. 2007

Ionics

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Ceria rare earth solid solutions are known as solid electrolyte with potential application in oxygen sensors and solid oxide fuel cells. We report the preparation of gadolinia-doped ceria, Ce 0.90 Gd 0.10 O 1.95 , by the conventional solid-state reaction method and the preparation of thin films from a sintered pellet of gadolinia-doped ceria by the pulsed laser deposition technique. The effect of process conditions, such as substrate temperature, oxygen partial pressure, and laser energy on microstructural properties of these films are examined using powder X-ray diffraction, scanning electron microscopy, atomic force microscopy, and Raman spectroscopy.

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“…Materials with lower E a will facilitate ionic conductivity at lower temperatures, and here rare-earth doped ceria is one of the main candidates (1,4). The basic principle for the choice of a dopant, advocated by many researchers, is the ability of the dopant to minimize the internal strain of the lattice (6)(7)(8). Clear understanding of the physics behind the ionic conductivity in doped ceria and the factors that determine E a would be very helpful for future development of advanced solid oxide fuel cells.…”

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confidence: 99%

Optimization of ionic conductivity in doped ceria

Andersson

Simak

Skorodumova

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

478

391

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Oxides with the cubic fluorite structure, e.g., ceria (CeO2), are known to be good solid electrolytes when they are doped with cations of lower valence than the host cations. The high ionic conductivity of doped ceria makes it an attractive electrolyte for solid oxide fuel cells, whose prospects as an environmentally friendly power source are very promising. In these electrolytes, the current is carried by oxygen ions that are transported by oxygen vacancies, present to compensate for the lower charge of the dopant cations. Ionic conductivity in ceria is closely related to oxygen-vacancy formation and migration properties. A clear physical picture of the connection between the choice of a dopant and the improvement of ionic conductivity in ceria is still lacking. Here we present a quantum-mechanical first-principles study of the influence of different trivalent impurities on these properties. Our results reveal a remarkable correspondence between vacancy properties at the atomic level and the macroscopic ionic conductivity. The key parameters comprise migration barriers for bulk diffusion and vacancy-dopant interactions, represented by association (binding) energies of vacancy-dopant clusters. The interactions can be divided into repulsive elastic and attractive electronic parts. In the optimal electrolyte, these parts should balance. This finding offers a simple and clear way to narrow the search for superior dopants and combinations of dopants. The ideal dopant should have an effective atomic number between 61 (Pm) and 62 (Sm), and we elaborate that combinations of Nd͞Sm and Pr͞Gd show enhanced ionic conductivity, as compared with that for each element separately. density functional theory ͉ diffusion ͉ point defects ͉ solid oxide fuel cells ͉ CeO 2 M aterials providing high conductivity of oxygen ions are urged by a number of important technological applications, such as oxygen sensors and solid oxide fuel cells (1). The latter are expected to become high-efficiency electrical power generators that enable clean energy production and support sustainable development (2-4). A standard electrolyte for solid oxide fuel cell applications is yttria-stabilized zirconia (YSZ) (1, 5). To increase the ionic conductivity of YSZ to a technologically useful level, high operating temperatures (Ϸ1,000°C) are required. Lowering of the operating temperatures would considerably increase the applicability and competitiveness of solid oxide fuel cells. The ionic conductivity ( ) can be expressed as an exponential function of the activation energy for oxygen vacancy diffusion (E a ),where T stands for temperature, k B for the Boltzman constant, and 0 for a temperature-independent prefactor. Materials with lower E a will facilitate ionic conductivity at lower temperatures, and here rare-earth doped ceria is one of the main candidates (1, 4). The basic principle for the choice of a dopant, advocated by many researchers, is the ability of the dopant to minimize the internal strain of the lattice (6-8). Clear understanding of the phys...

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A study of oxygen ion conductivity in doped non-stoichiometric oxides

Cited by 458 publications

References 16 publications

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Microstructural studies of bulk and thin film GDC

Optimization of ionic conductivity in doped ceria

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