A novel Nb2O5-doped SrCo0.8Fe0.2O3−δ oxide with high permeability and stability for oxygen separation

Zhang, Guangru; Liu, Zhengkun; Zhu, Na; Jiang, Wei; Dong, Xueliang; Jin, Wanqin

doi:10.1016/j.memsci.2012.03.026

Cited by 91 publications

(31 citation statements)

References 63 publications

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“…These results indicate that the average metal-oxygen binding energy increases with increasing zirconium content [30]. The oxygen desorption peak at intermediate temperatures and elevated temperatures is assigned to α-O 2 desorption and β-O 2 desorption, which are attributed to the reduction of Fe 4 þ to Fe 3 þ and Fe 3 þ to Fe 2 þ , respectively [29].…”

Section: Structure and Stabilitymentioning

confidence: 80%

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: Structure and Stabilitymentioning

confidence: 80%

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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show abstract

“…13). Previous studies also reveal improvement in phase stability with addition of fixed oxidation state elements in the perovskite structure but at the cost of oxygen permeability [19,27,48,49]. This happens with zirconium incorporation at Bsite in SrCo 0.8 Fe 0.2-y Zr y O 3−δ system as well for y = 0.075 and 0.1 because of SrZrO 3 presence perhaps as a secondary phase.…”

Section: Membrane Stabilitymentioning

confidence: 86%

“…Therefore, the σ data reported in the paper belong essentially to the SCFO disc. Moreover, the The electrical conductivity (σ) arising due to polaron hopping in oxides is given by [19] …”

Section: Electrical Conductivity Measurementsmentioning

confidence: 99%

“…The higher fraction of B 4+ ions may lead to formation of B 3+ ions by capturing electrons released during oxygen desorption at elevated temperatures. As a consequence, B 4+ ions and hopping sites both decrease and cause lowering in electrical conductivity [19]. Further, significant overlap of the transition metal 3d and oxygen 2p orbitals in linear disposition of B-O-B (B=Co, Fe) bond gives rise to desired improvement in the electronic transport as well [46].…”

Section: Electrical Conductivity Measurementsmentioning

confidence: 99%

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On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

Kashyap

Jaiswal

Kumar

2016

Ionics

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The high oxygen permeability combined with reasonable structural stability of perovskite-type ABO 3−δ compounds is vital for their potential applications in gas separation, solid oxide fuel cells, sensors, etc. Hence, an attempt is made to develop SrCo 0.8 Fe 0.2 O 3−δ -based dense membranes with sol-gel-derived oxalates and study their phase stability and oxygen permeation. While X-ray diffraction confirms the presence of a perovskite-type cubic phase above 800°C, Xray photoelectron spectroscopy reveals the presence of cobalt and iron in 3+ and 4+ oxidation states with O 2 2− , O 2 − and O − species. The electrical conductivity increases up to a characteristic temperature and decreases slowly thereafter via pronounced carrier scattering. A 1.5-mm-thick membrane disp l a y s r e a s o n a b l e o x y g e n p e r m e a b i l i t y o f 1.05 × 10 −6 mol cm −2 s −1 at 900°C but has inadequate stability. Partial substitution of iron with zirconium is shown to improve permeability and stability significantly. Thus, SrCo 0.8 Fe 0.15 Zr 0.05 O 3−δ membrane shows promise for oxygen permeation purposes.

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“…A number of studies have shown that Gd-doped ceria (CGO), the oxygen ion conductor, possesses inherently high chemical stability while its oxygen flux is limited by electronic conductivity [24]. It's also known that electronic conducting oxides such as SrCo 0.8 Fe 0.1 Nb 0.1 O 3Àd (SCFN) shows high oxygen permeability [25]. In addition, in 2012, Zhu et al [26] proposed a new oxygen permeation model based on the theoretical analysis by Virkar [27].…”

Section: Introductionmentioning

confidence: 99%

Oxygen permeability and CO2-tolerance of Ce0.9Gd0.1O2−δ – SrCo0.8Fe0.1Nb0.1O3−δ dual-phase membrane

Zhou

Tang

et al. 2015

Journal of Alloys and Compounds

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A novel Nb2O5-doped SrCo0.8Fe0.2O3−δ oxide with high permeability and stability for oxygen separation

Cited by 91 publications

References 63 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

On the structural stability and oxygen permeation behavior of inorganic SrCo0.8Fe0.2O3−δ membranes

Oxygen permeability and CO2-tolerance of Ce0.9Gd0.1O2−δ – SrCo0.8Fe0.1Nb0.1O3−δ dual-phase membrane

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