High valence transition metal doped strontium ferrites for electrode materials in symmetrical SOFCs

Fernández-Ropero, Antonio J.; Porras-Vázquez, José M.; Cabeza, Aurelio; Slater, Peter R.; Marrero-López, D.; Losilla, Enrique R.

doi:10.1016/j.jpowsour.2013.10.118

Cited by 111 publications

(77 citation statements)

References 27 publications

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“…Cobalt-iron based typical cathode materials with single phase were then used as SSOFC electrodes, for example, Ln x Sr 1-x Co 0.8 Fe 0.2 O 3-δ (Ln = La, Ce) [12][13][14] and SrFe 0.75 M 0.25 O 3-δ (M = Ti, Zr, V, Nb, Cr, Mo and W) [15]. Although these materials demonstrate considerable activity for hydrogen or methane oxidation, their structure stability in reducing atmospheres is still a significant concern [16].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3−δ for symmetrical solid oxide fuel cells

Yin

et al. 2015

Electrochemistry Communications

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Section: Accepted Manuscriptmentioning

confidence: 99%

A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3−δ for symmetrical solid oxide fuel cells

Yin

et al. 2015

Electrochemistry Communications

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“…Doping of rare earth metals such as La has been reported to enhance the magnetic properties of the strontium ferrites [8]. For the enhancement of the capability of strontium hexaferrites being used as electrode materials in solid oxide fuel cells (SOFCs), doping of high valence transition metals has also been reported [9]. The substitution of dopant in strontium hexaferrites plays a significant role in alteration of their physical properties.…”

Section: Introductionmentioning

confidence: 99%

Study of dielectric relaxations in co-precipitated Sr–Fe(Cr) nanoferrites

Anis-ur-Rehman

Zahra

Kanwal

et al. 2015

J Mater Sci: Mater Electron

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Chromium (Cr) doped strontium hexaferrites with nominal composition SrFe 12-x Cr x O 19 (x = 0.0, 0.1, 0.2, 0.3) were prepared using co-precipitation method. Thermal analysis of the samples was carried out using thermogravimetric analysis and differential scanning calorimetry to study the thermal stability as well as the transitions within the samples with variation in temperature. Structural analysis of the samples was carried out using X-ray diffraction (XRD). XRD revealed that all the samples possess hexagonal structure with space group P63/ mmc. AC electrical properties including dielectric constant (e 9), dielectric loss tangent (tan d) and ac electrical conductivity (r ac ) were studied as a function of frequency (1 kHz-3 MHz) at temperatures 100-700°C. The dielectric losses tend to decrease with increasing Cr content. AC conductivity could be very well explained by Jonscher power law. These materials have applications in high frequency devices with reduced energy losses.

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“…In addition, the materials should possess suffi cient electrical conductivity over a wide P O2 window. [ 46,47,[64][65][66][67] Some cations with fi xed valence states, like Zr 4+ , Zn 2+ , Al 3+ and Sc 3+ , can also be doped into the perovskite oxide lattice to increase the chemical stability of the oxides in reducing conditions, [68][69][70][71][72][73][74] but their content must be kept below an upper limit to minimize obstruction of electron hopping by their presence. [ 60 ] The key to introducing conductivity to a perovskite oxide material is to dope a metal cation with a variable oxidation state into the B-site of the lattice structure.…”

Section: Single Phase Oxide Electrode With a Stable Structurementioning

confidence: 99%

Progress and Prospects in Symmetrical Solid Oxide Fuel Cells with Two Identical Electrodes

Wang

Liu

et al. 2015

Advanced Energy Materials

143

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The increasing impact of the greenhouse effect and environmental pollution from excessive and low-effi ciency use of everdiminishing fossil fuels has urged us to develop new energy materials and technologies for transitioning to a sustainable infrastructure. With this in mind, fuel cells, based on a concept Symmetrical solid oxide fuel cells (SOFCs) have attracted increasing attention due to their potential for improved thermomechanical compatibility of the electrolyte and the electrodes, reduced fabrication cost, and enhanced immunity to coking and sulfur poisoning. While the electrode materials of symmetrical SOFCs are initially limited to those with stable phase structures under both reducing and oxidizing atmospheres, many novel electrode materials are currently being developed and investigated that may undergo a benefi cial phase transition or reduction in a reducing atmosphere, although the same material may be used initially for the construction of both anode and cathode. Here, the advances made in the development of electrode materials and structures for symmetrical SOFCs are summarized, including single-phase electrodes, multi-phase (composite) electrodes, and those that are reducible upon exposure to a reducing atmosphere. The electrical conductivity, thermomechanical properties, and redox behavior of these electrode materials, together with their performance and stability in different SOFCs, are discussed and analyzed. The problems associated with different types of symmetrical SOFCs are outlined and the materials that show promise as symmetrical electrodes are highlighted, offering critical insights and useful guidelines for knowledge-based rational design of better electrodes for commercially viable symmetrical SOFCs.

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High valence transition metal doped strontium ferrites for electrode materials in symmetrical SOFCs

Cited by 111 publications

References 27 publications

A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3−δ for symmetrical solid oxide fuel cells

A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3−δ for symmetrical solid oxide fuel cells

Study of dielectric relaxations in co-precipitated Sr–Fe(Cr) nanoferrites

Progress and Prospects in Symmetrical Solid Oxide Fuel Cells with Two Identical Electrodes

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