Ln1−xSrxCo1−yFeyO3−δ (Ln=Pr, Nd, Gd; x=0.2, 0.3) for the electrodes of solid oxide fuel cells

Qiu, L.

doi:10.1016/s0167-2738(02)00757-9

Cited by 170 publications

(44 citation statements)

References 14 publications

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“…On the contrary, in the Pr 1-y Sr y Co 1-x Fe x O 3-δ perovskite structure with larger Pr replace La the orthorhombic phase existence range in the first approximation are between x= 0.0 and x=1.0. Apparently the orthorhombic structural relationship between lattice parameters of Pr 1-y Sr y Co 1-x Fe x O 3-δ solid solution is in seemingly agreement with those of Meng et al [17] who recently found a single orthorhombic perovskite-structure (PrCoO 3 -type) in the Pr 1-y Sr y Co 0.8-Fe 0.2 O 3-δ solid solution when mole fraction of Sr was between 0.2 and 0.6, and with those of Qiu et al [30] who resolved XRD patterns obtained in the Pr 1-y Sr y Co 1-x Fe x O 3-δ (y = 0.2−0.3; 0.0 ≤ x ≤ 1.0) as an orthoferrite structure (GdFeO 3 -type) with space group Pbnm. While, it can be note that recently Kim and co-workers registered a small peak split at 59°(2θ) just for Pr 0.3 Sr 0.7 Co 0.7 Fe 0.3 O 3-δ samples [18].…”

Section: Structural Analysissupporting

confidence: 91%

Nano-sized Pr0.8Sr0.2Co1-xFexO3 powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes

2009

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Different sets of perovskite-type oxides of general formula Pr 0.8 Sr 0.2 Co 1-x Fe x O 3-δ (x=0.0, 0.2, 0.5, 0.8 and 1.0) were successfully prepared by low-cost single-step combustion synthesis at low temperatures based on the auto-ignition reaction of a nitrate solution in the presence of citric acid. Thermogravimetric and differential thermal analysis was carried out on nitrate-citrate precursors to determine the perovskite-phase formation process. The results revealed that the nitrate-citrate precursor exhibited self-propagating combustion behavior. Pr 0.8 Sr 0.2 Co 1-x Fe x O 3-δ powders showed an orthorhombic single-phase, with their unit cell volume increasing as a function of the Fe content (x). Scanning electron microscopy observations showed that the prepared powders were nanocrystalline. The Pr 0.8 Sr 0.2 Co 1-x Fe x O 3-δ powders were characterized as fuel cell electrodes on Ce 0.8 Sm 0.2 O 2-δ pellets in symmetrical cells, and the electrochemical properties of the electrode/electrolyte interfaces were investigated using electrochemical impedance spectroscopy (EIS) as a function of the temperature, Fe content (x) and oxygen partial pressure.

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Section: Structural Analysissupporting

confidence: 91%

Nano-sized Pr0.8Sr0.2Co1-xFexO3 powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes

2009

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“…This suggests that Co diffusion may be the main reason for LaSrGaO 4 precipitation. Single perovskite phase with orthorhombic structure was identified for PSCF powder (Figure 6), which is in agreement with the work of Qiu et al (16). PSCF and LSGM peaks showed up as distinct peaks in the XRD pattern of composite PSCF/LSGMC on a LSGM pellet.…”

Section: Resultssupporting

confidence: 90%

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

Do¹,

Guo²,

Lu³

et al. 2008

ECS Trans.

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16 Ω were measured for LSCF/LSGMC composite cathode on LSGM substrate at 800ºC in air. Low-frequency secondary arcs in the impedance spectra of LSCF/LSGMC cathode coupled with low current density and low cathode porosity suggested possible mass transfer limitations. The LSCF/LSGMC composite electrode performed best at 800ºC (0.11 A/cm 2 at 0.045 V overpotential) while the BSCF/LSGMC performed best at the lowest temperature investigated (0.1 A/cm 2 at 700ºC and 0.04 V overpotential).

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“…[18] The primitive unit-cell volume of Gd 0.5 Sr 0.5 CoO 3±d is only 55.08 3 and its thermal expansion coefficient would be expected to be in the region 15±18 10 ±6 K ±1 by analogy with similar compounds. [19,20] Therefore, this may not be the best structurally matched perovskite for this system, but it does offer reasonable performance and was able to be utilized as a cathode on LSGMCo. In this report, for the first time we demonstrate that it is possible to design and demonstrate an all-perovskite fuel cell.…”

mentioning

confidence: 99%

An Efficient Solid Oxide Fuel Cell Based upon Single‐Phase Perovskites

2005

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desired structure of Permalloy elements. The magnetic-domain states of the elements were probed using a Nanoscope Dimension 3100 MFM in lift-mode. The magnetic field was applied in situ by using a specially designed electromagnet integrated in the MFM.In the computer simulations using the OOMMF [9], a box of dimensions 3 lm 2 lm, with an ellipse 1.875 lm 0.625 lm drawn inside, was created. The box was discretized into 5 nm 5 nm 31.25 nm blocks with spins placed only within the ellipse, while the area surrounding it was regarded as empty space. The material parameters used were typical for Permalloy (exchange stiffness constant of 13 10 ±12 J m ±1 , saturation magnetization of 860 kA m ±1, and zero magnetocrystalline anisotropy to mimic a polycrystalline sample).

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Ln1−xSrxCo1−yFeyO3−δ (Ln=Pr, Nd, Gd; x=0.2, 0.3) for the electrodes of solid oxide fuel cells

Cited by 170 publications

References 14 publications

Nano-sized Pr0.8Sr0.2Co1-xFexO3 powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes

Nano-sized Pr0.8Sr0.2Co1-xFexO3 powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

An Efficient Solid Oxide Fuel Cell Based upon Single‐Phase Perovskites

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