Electrical Conductivity and Chemical Diffusion Coefficient of Strontium-Doped Lanthanum Manganites

Yasuda, Isamu; Hishinuma, Masakazu

doi:10.1006/jssc.1996.0193

Cited by 155 publications

(113 citation statements)

References 5 publications

Supporting

Mentioning

105

Contrasting

Order By: Relevance

“…35. Although the fuel production halfcycle was not directly probed, the authors were able to show greater oxygen release from the perovskite than from ceria at moderate temperatures, indicating the potential for greater fuel productivity under reduced temperature cycling conditions.…”

mentioning

confidence: 97%

Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting

et al. 2014

View full text Add to dashboard Cite

Solar-driven thermochemical water splitting using non-stoichiometric oxides has emerged as an attractive technology for solar fuel production. The most widely considered oxide for this purpose is ceria, but the extreme temperatures required to achieve suitable levels of reduction introduce challenges in reactor design and operation, leading to efficiency penalties. Here, we provide a quantitative assessment of the thermodynamic and kinetic properties of La 1Àx Sr x MnO 3Àd perovskites, targeted for a reduced temperature operation of thermochemical water splitting. Sr-doping into lanthanum manganite increases the thermodynamic fuel production capacity, which reaches 9 ml g À1 for 0.

show abstract

mentioning

confidence: 97%

Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting

et al. 2014

View full text Add to dashboard Cite

show abstract

“…After stabilization, the oxygen partial pressure was suddenly changed from 0.21 to 0.1 atm by switching gases and the dependence of the apparent conductivity on time was recorded. The time dependence of the apparent conductivity can be expressed in a rectangular geometry of width 2w, thickness 2h and length 2l, as 19,20 * Electrochemical Society Active Member. z E-mail: chenfa@cec.sc.edu…”

mentioning

confidence: 99%

Sr2Fe1.5Mo0.5O6 as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells with La0.8Sr0.2Ga0.87Mg0.13O3 Electrolyte

Xiao

Liu

Zhao

et al. 2011

J. Electrochem. Soc.

131

View full text Add to dashboard Cite

“…The observed relaxation time depends on two processes: the oxygen exchange at the interface between the gas and the solid, and the oxygen bulk diffusion. 13,14 In the present study, both the surface exchange coefficient K and the chemical diffusion coefficient D are obtained by examining the weight change of crystals as a function of time.The oxygen-exchange behaviour in cubic manganese oxide and its layered counterpart, studied in polycrystalline samples with comparable morphology, is shown in Fig. 2.…”

mentioning

confidence: 99%

Achieving fast oxygen diffusion in perovskites by cation ordering

Taskin

Лавров

Ando

2005

Applied Physics Letters

442

287

View full text Add to dashboard Cite

The oxygen-exchange behavior has been studied in half-doped manganese and cobalt perovskite oxides. We have found that the oxygen diffusivity in Gd0.5Ba0.5MnO 3−δ can be enhanced by orders of magnitude by inducing crystallographic ordering among lanthanide and alkali-earth ions in the A-site sublattice. Transformation of a simple cubic perovskite, with randomly occupied A-sites, into a layered crystal GdBaMn2O5+x (or isostructural GdBaCo2O5+x for cobalt oxide) with alternating lanthanide and alkali-earth planes reduces the oxygen bonding strength and provides disorder-free channels for ion motion, pointing to an efficient way to design new ionic conductors.PACS numbers: 66.30. Hs, 82.47.Ed Oxygen ion conductors -solids exhibiting very fast oxygen diffusion -constitute the basis for such emerging technologies as the membrane oxygen separation or the solid-oxide fuel cell (SOFC) power generation.1,2 . These technologies offer enormous economical and ecological benefits provided high performance materials can be developed: The scientific challenge is to design materials demonstrating high oxygen diffusivity at low enough temperature.In general, a crystal must meet two fundamental requirements to be a good oxygen-ion conductor: (i) it must contain a lot of vacancies in the oxygen sublattice, and (ii) the energy barrier for oxygen migration from one site to another must be fairly small, typically less than ∼ 1 eV. Only a few types of oxides, and perovskites ABO 3 (A is a rare-earth or an alkali-earth element and B is typically a transition metal) among them, have been found to possess these features. 1,2,3,4,5,6,7,8 Doped perovskites, which possess a high electronic conductivity in addition to the ionic one, are considered for using as electrodes in SOFC and as oxygen-selective membranes; for example, strontium-doped lanthanum manganese oxide, La 1−y Sr y MnO 3−δ , is a standard cathode material for SOFC applications operating at temperatures around 1000• C. 6 Recently, serious efforts are made to reduce the operation temperature of SOFC, and for the operation at 700 -800• C, strontium-doped lanthanum cobalt oxide, La 1−y Sr y CoO 3−δ , is considered to be the most promising cathode material.7,8 The performance of perovskite oxides has been already optimized as much as possible mostly by means of various ion substitutions in both A and B sublattices, 6,7,8,9 but they still fail to operate at low enough temperatures ∼ 500• C required for successful commercialization of the fuel cell technology.In this Letter, we show that the oxygen-ion diffusion in a doped perovskite can be enhanced by orders of magnitude if a simple cubic crystal [schematically shown in Fig.1(a)] transforms into a layered compound with ordered lanthanide and alkali-earth ions [ Fig. 1(b)], which reduces the oxygen bonding strength and provides disorder-free channels for ion motion.Recently, the A-site-ordered manganese and cobalt perovskite oxides have been synthesized by several , which demonstrate the doubling of the unit cell along the c axis ...

show abstract

Electrical Conductivity and Chemical Diffusion Coefficient of Strontium-Doped Lanthanum Manganites

Cited by 155 publications

References 5 publications

Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting

Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting

Sr2Fe1.5Mo0.5O6 as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells with La0.8Sr0.2Ga0.87Mg0.13O3 Electrolyte

Achieving fast oxygen diffusion in perovskites by cation ordering

Contact Info

Product

Resources

About