SrCo1−xSbxO3−δ perovskite oxides as cathode materials in solid oxide fuel cells

Aguadero, Ainara; Pérez-Coll, Domingo; Calle, C. de la; Alonso, J. A.; Escudero, M.J.; Daza, L.

doi:10.1016/j.jpowsour.2008.12.138

Cited by 110 publications

(89 citation statements)

References 29 publications

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“…The conductivity behaviour is similar to previously observed for doping with Nb, Sb (and other cations such as Cr, Ti and Fe) [20][21][22], and can be attributed to the change from a hexagonal perovskite with face sharing of octahedra, to a cubic cell with corner sharing, and mixed…”

Section: Srco 1-x Si X O 3-ysupporting

confidence: 82%

“…Doping SrCoO 3-y on the Co site with a range of cations, e.g. Nb, Sb, has been shown to help to stabilise the cubic perovskite polymorph, containing corner linked CoO 6 octahedra, leading to a substantial enhancement in the conductivity [20][21][22]. This stabilisation of the cubic phase on Nb, Sb doping can be attributed to a partial reduction of the Co 4+ towards…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of silicon doped SrMO3 (M = Mn, Co): stabilization of the cubic perovskite and enhancement in conductivity

Hancock

Slater

2011

Dalton Trans.

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In this paper we report the successful incorporation of silicon into SrMO 3 (M=Co, Mn) leading to a structural change from a hexagonal to a cubic perovskite. For M=Co, the cubic phase was observed for low doping levels (3%), and these doped phases showed very high conductivities ( up to ≈350 Scm -1 at room temperature For M=Mn, the work showed that higher substitution levels were required to form the cubic perovskite (≈15% Si doping), although in these cases the phases were shown to be stable to annealing at intermediate temperatures. Conductivity measurements again showed an enhancement in the conductivity on Si doping, although the conductivities were lower (≈0.3 -14 Scm -1 in the range 20-800 ○ C) than the cobalt containing systems.The conductivities of both systems suggest potential for use as cathode materials in solid oxide fuel cells.

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Section: Srco 1-x Si X O 3-ysupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Synthesis of silicon doped SrMO3 (M = Mn, Co): stabilization of the cubic perovskite and enhancement in conductivity

Hancock

Slater

2011

Dalton Trans.

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“…In contrast, for P doping, the higher conductivity was observed for x=0.05 compared to x=0.03. The conductivities for all samples show a decrease above ≈350 ○ C, which can be attributed to oxygen loss above this temperature, as observed in related studies on doping SrCoO 3 with similar size cations (Nb, Sb) [28][29][30][31].…”

Section: Electronic Conductivity Datasupporting

confidence: 77%

“…Nb, Sb, Si has been shown to alter the stacking arrangement of the close packed oxygen layers from purely hexagonal to purely cubic (referred to as 2H and 3C respectively). The consequent change from face-shared to corner linked CoO 6 octahedra, leads to a substantial enhancement in the electronic conductivity [28][29][30][31][32]. This stabilisation of the 3C-perovskite framework on Nb, Sb, Si doping can be attributed to a partial reduction of Co 4+ to Co…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and conductivity of sulfate and phosphate doped SrCoO3

Hancock

Slade

Varcoe

et al. 2011

Journal of Solid State Chemistry

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In this paper we report the successful incorporation of sulfate and phosphate into SrCoO 3 leading to a change from a 2H-to a 3C-perovskite polymorph. Structural characterization by neutron diffraction showed extra weak peaks related to oxygen vacancy ordering, and these could be indexed on an expanded tetragonal cell, containing two inequivalent Co sites, similar to previously reported for Sb doped SrCoO 3 .Conductivity measurements on the doped systems showed a large enhancement compared to the undoped hexagonal system, consistent with corner-sharing of CoO 6 octahedra for the former. Further work on the doped samples shows, however, that they are metastable, transforming back to the hexagonal cell on annealing at intermediate temperatures. The incorporation of Fe was shown, however, to improve the stability at intermediate temperatures, and these co-doped phases also showed high conductivities.

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“…These complex oxides can be properly modified by the partial substitution of atoms at A and/or B sites, which may strongly affect their physical properties. Indeed, depending on the doping component and level, the material can display ferromagnetic or thermo-electrical properties [9,10] and electrochemical properties [11,12]. BaFeO 3-δ doped with various metal ions such as Nb [13], Ca [14], Co [12], Ca and Co [15], were previously studied.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Hanane¹,

Omari²

2016

ChChT

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Abstract. In this study, BaFe 1−x Al x O 3-δ (0 ≤ x ≤ 0.3) perovskite-type oxides were prepared by sol-gel method using citric acid as chelating agent. The samples were subjected to various calcination temperatures in order to investigate the physicochemical properties of the oxide affected by the parameter. Thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray diffraction (XRD) techniques are used to explore precursor decomposition and to establish adequate calcination temperature for the preparation of the nanopowders. The studied compounds have hexagonal crystal structure at the temperature of 1123 K. The samples obtained after calcination at 1123 K were characterized by XRD, Brunauer-Emmett-Teller surface area analysis, scanning electron microscopy, powder size distribution and electrical conductivity. The microstructure and morphology of the compounds show that the particles are nearly spherical in shape and are partially agglomerated. The highest surface area and total pore volume are achieved for BaFe 0.8 Al 0.2 O 3-δ oxide. Temperature dependence of electrical conductivity shows a semiconducting behavior.

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SrCo1−xSbxO3−δ perovskite oxides as cathode materials in solid oxide fuel cells

Cited by 110 publications

References 29 publications

Synthesis of silicon doped SrMO3 (M = Mn, Co): stabilization of the cubic perovskite and enhancement in conductivity

Synthesis of silicon doped SrMO3 (M = Mn, Co): stabilization of the cubic perovskite and enhancement in conductivity

Synthesis, structure and conductivity of sulfate and phosphate doped SrCoO3

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

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