Evaluation of La0.3Sr0.7Ti1−xCoxO3 as a potential cathode material for solid oxide fuel cells

Du, Zhenmin; Zhao, Hailei; Shen, Yanjun; Wang, Lu; Fang, Mengya; Świerczek, Konrad; Zheng, Kun

doi:10.1039/c4ta00658e

Cited by 54 publications

(23 citation statements)

References 58 publications

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“…2. This result is also in agreement with La 0.3 Sr 0.7 Ti 1 À x Co x O 3 oxides, in which the Co 4 þ concentration decreases from 48% to 24% with an increase in the Ti content from 0.40 to 0.55 [34]. A chemical shift to a higher binding energy was observed for the doublet peaks assigned to both Fe 4 þ and Fe 3 þ , which can be attributed to the stronger Zr-O bond energy as compared to that of Fe-O.…”

Section: Xps Analysissupporting

confidence: 91%

“…5(a). All samples experience a distinct weight loss in the initial stage of the experiment below 300 1C, probably originating from the desorption of the absorbed gas mixture on the powder samples and the evaporation of water [34]. A distinct mass gain is observed for the sample with x ¼0, and a small one is detected for that with x ¼0.05, which originates from the formation of carbonates generated by the reaction between Ba 2 þ and CO 2 [23,37].…”

Section: Thermogravimetric Analysismentioning

confidence: 98%

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Novel cobalt-free CO2-tolerant dual-phase membranes of Ce0.8Sm0.2O2−–Ba0.95La0.05Fe1−Zr O3− for oxygen separation

Cheng

Luo

Yao

et al. 2015

Journal of Membrane Science

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a b s t r a c tA novel series of cobalt-free dense oxygen-permeable dual-phase membranes with a composition of 60 wt% Ce 0.8 Sm 0.2 O 2 À δ and 40 wt% Ba 0.95 La 0.05 Fe 1 À x Zr x O 3 À δ (SDC-BLFZ, x ¼0-0.20) are successfully developed and systematically evaluated as potential oxygen transport membranes for oxy-fuel combustion. The effects of substituting zirconium for iron on the structural characteristics, oxygen permeability, and CO 2 resistance of these membranes are studied. Experimental results show that appropriate doping of zirconium slightly decreases the oxygen permeability of the SDC-BLFZ membranes under helium but significantly enhances the structural stability and CO 2 tolerance. For the sample with x ¼0.15, a stable oxygen permeation flux of 0.24 ml min À 1 cm À 2 was achieved at 925 1C for a 1.0 mm thick membrane with CO 2 as the sweep gas for more than 80 h. This flux value is only 19% lower than that under an air/He gradient, which is much better than that obtained with most alkaline-metalcontaining composite dual-phase membranes. The enhanced CO 2 tolerance of the Zr-doped SDC-BLFZ membranes is attributed to the declining basicity of BLFZ induced by the substitution of Fe by Zr, as revealed by X-ray photoelectron spectroscopy (XPS). The stable oxygen permeability of the SDC-BLFZ membranes under CO 2 demonstrates the potential application of SDC-BLFZ in oxy-fuel combustion technology.

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Section: Xps Analysissupporting

confidence: 91%

Section: Thermogravimetric Analysismentioning

confidence: 98%

Novel cobalt-free CO2-tolerant dual-phase membranes of Ce0.8Sm0.2O2−–Ba0.95La0.05Fe1−Zr O3− for oxygen separation

Cheng

Luo

Yao

et al. 2015

Journal of Membrane Science

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“…BaFe 1Àx Gd x O 3Àd (0 # x # 0.20) oxides were prepared via an ethylenediamine tetraacetic acid (EDTA)-citric acid combustion method as described previously. 37,38 The stoichiometric raw materials of Ba(NO 3 ) 2 (AR, Sinopharm), Fe(NO 3 ) 3 $9H 2 O (AR, Sinopharm), and Gd 2 O 3 (AR, Sinopharm) were dissolved in distilled water with the addition of several drops of nitric acid (65-68%, AR, Sinopharm) to obtain a clear metal nitrate solution. Thereaer, EDTA and citric acid were added into the solution at a molar ratio of 1 : 1.5 : 1 to the total number of metal ions.…”

Section: Materials Preparationmentioning

confidence: 99%

Novel cobalt-free BaFe_1−xGd_xO_3−δ perovskite membranes for oxygen separation

Zhao

Chang

et al. 2016

J. Mater. Chem. A

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13 Cobalt-free perovskite-type mixed ionic and electronic conductor (MIEC) is of 14 technological and economic importance in many energy related applications. In this work, a new 15 group of Fe-based perovskite MIEC with BaFe 1-x Gd x O 3-δ (0.025≤x≤0.20) compositions was 16 developed for the application in oxygen permeation membrane. Slight Gd doping (x=0.025) can 17 stabilize the cubic structure of BaFe 1-x Gd x O 3-δ perovskite. The Gd substitution of BaFe 1-x Gd x O 3-δ 18 materials increases the structural and chemical stability in atmosphere containing CO 2 and H 2 O, 19and decreases the thermal expansion coefficient. The BaFe 0.975 Gd 0.025 O 3-δ membrane exhibits fast 20 oxygen surface exchange kinetics and high bulk diffusion coefficient, and achieves a high oxygen 21 2 permeation flux of 1.37 mL cm -2 min -1 for 1 mm thick membrane at 950 o C under Air/He oxygen 1 gradient, which can maintain stable at 900 o C for 100 h. Compared to the pristine BaFeO 3-δ and the 2 well-studied Ba 0.95 La 0.05 FeO 3-δ membranes, lower oxygen permeation activation energy and higher 3 oxygen permeability are obtained for the 2.5 at. % Gd doped material, which might be attributed to 4 the expanded lattice by doping large Gd 3+ cations and limited negative effect from strong Gd-O 5 bond. A combination study of first principle calculation and experimental measurements was 6 further conducted to advance the understanding of Gd effects on oxygen migration behavior in 7BaFe 1-x Gd x O 3-δ . These findings are expected to provide guidelines for the material design of high 8 performance MIECs. 9

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“…Figure (a) shows the changes of electrical conductivity (σ) of PSCFN x (x=0, 0.05, 0.1 and 0.2) in air with the temperature from 100 to 900 °C. One can see that all electrical conductivities increased at first and then decreased by further increase of temperature over a transition point, which is in accordance with the small polaron hopping mechanism, in which the electron and holes acted as the charge carriers ,. This is a thermally activated process at lower temperature where the conductivity increased with the increase in temperature.…”

Section: Resultsmentioning

confidence: 99%

Characterization of B‐Site Niobium‐Doped Pr_0.4Sr_0.6 (Co_0.3Fe_0.6)_1‐xNb_xO_3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

Xiaokaiti

Yoshida

et al. 2018

ChemistrySelect

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Perovskite materials of Pr0.4Sr0.6(Co0.3Fe0.6)1‐xNbxO3‐δ (PSCFNx, x=0, 0.05, 0.1, 0.2) were firstly synthesized as the cathode materials for solid oxide fuel cells (SOFCs) by doping niobium(Nb) at the B site of Pr0.4Sr0.6Co0.3Fe0.6O3‐δ using a solid state reaction method. The effect of Nb doping amount on the lattice structure, oxygen desorption and electrochemical properties of PSCFNx at different calcination temperatures were investigated. It is found that this material family had perfectly cubic structure based on the Pm‐3 m space group whose lattice size increased with x. These materials were thermally stable after calcination and showed desirable chemical compatibility with electrolyte in the condition of calcination at 1250 °C for 8 h under an air atmosphere. The optimum x value of 0.1 was found for the PSCFNx cathode materials, which had the minimum polarization resistance value of 0.018 Ωcm2 at 900 °C. As a result, the single cell with the PSCFN0.1 cathode delivered a power density of 0.731 Wcm−2 at 900 °C with humidified H2 (∼3% H2O) as the fuel and ambient air as the oxidant. It indicates that PSCFN0.1 should be a promising cathode material for the SOFCs.

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Evaluation of La_0.3Sr_0.7Ti_1−xCo_xO₃ as a potential cathode material for solid oxide fuel cells

Abstract: La0.3Sr0.7Ti1−xCoxO3 perovskite, with excellent electrochemical performance and good structural stability, is a promising candidate for the cathode of IT-SOFCs.

Cited by 54 publications

References 58 publications

Novel cobalt-free CO2-tolerant dual-phase membranes of Ce0.8Sm0.2O2−–Ba0.95La0.05Fe1−Zr O3− for oxygen separation

Novel cobalt-free CO2-tolerant dual-phase membranes of Ce0.8Sm0.2O2−–Ba0.95La0.05Fe1−Zr O3− for oxygen separation

Novel cobalt-free BaFe_1−xGd_xO_3−δ perovskite membranes for oxygen separation

Characterization of B‐Site Niobium‐Doped Pr_0.4Sr_0.6 (Co_0.3Fe_0.6)_1‐xNb_xO_3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

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Evaluation of La0.3Sr0.7Ti1−xCoxO3 as a potential cathode material for solid oxide fuel cells

Abstract: La0.3Sr0.7Ti1−xCoxO3 perovskite, with excellent electrochemical performance and good structural stability, is a promising candidate for the cathode of IT-SOFCs.

Cited by 54 publications

References 58 publications

Novel cobalt-free CO2-tolerant dual-phase membranes of Ce0.8Sm0.2O2−–Ba0.95La0.05Fe1−Zr O3− for oxygen separation

Novel cobalt-free CO2-tolerant dual-phase membranes of Ce0.8Sm0.2O2−–Ba0.95La0.05Fe1−Zr O3− for oxygen separation

Novel cobalt-free BaFe1−xGdxO3−δ perovskite membranes for oxygen separation

Characterization of B‐Site Niobium‐Doped Pr0.4Sr0.6 (Co0.3Fe0.6)1‐xNbxO3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

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Evaluation of La_0.3Sr_0.7Ti_1−xCo_xO₃ as a potential cathode material for solid oxide fuel cells

Novel cobalt-free BaFe_1−xGd_xO_3−δ perovskite membranes for oxygen separation

Characterization of B‐Site Niobium‐Doped Pr_0.4Sr_0.6 (Co_0.3Fe_0.6)_1‐xNb_xO_3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells