On the synthesis and stability of La0.6Sr0.4Ga0.3Fe0.7O3

Bedon, Andrea; Natile, Marta Maria; Glisenti, Antonella

doi:10.1016/j.jeurceramsoc.2016.10.017

Cited by 10 publications

(11 citation statements)

References 36 publications

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“…The LSGF powder used for electrodes was synthesized via a solid-combustion route, with the same procedure explained in a previous work. [36] Two different inks were prepared for the screen printing of the electrodes on LSGM: a composite LSGF 50%/LSGM 50% and a pure LSGF ink. Ink preparation involved grinding of the powders and mixing them with proper amounts of α-terpineol and polyvinyl butyral binder, PVB.…”

Section: Cell Preparationmentioning

confidence: 99%

“…Its presence had already been investigated in a previous work, and its concentration has been found not to be modified by different thermal treatments suggesting that it is not a sign of material degradation. [36] Its appearance could be avoided lowering Ga concentration in LSGF (appearance of Ga rich phases are far less common if Ga stoichiometric coefficient is 0.3) at the expense of a part of performance, [39] however, since it does not cause any harm to the main phase, it has been preferred to tolerate its presence to obtain higher overall conductivity. There is also a small signal related to LaSrGaO4, that again was already present in pristine LSGF.…”

Section: Compatibilitymentioning

confidence: 99%

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Reversible, all-perovskite SOFCs based on La, Sr gallates

Glisenti

Bedon

Carollo

et al. 2020

International Journal of Hydrogen Energy

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In this contribution, a reversible Solid Oxide Cell based on perovskites was developed. La0.6Sr0.4Ga0.3Fe0.7O3 (LSGF) was chosen as electrode and deposited onto La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The cell was investigated from the morphological (SEM) and compatibility (XRD) point of view. Electrochemical investigation confirmed that the cell can operate in fuel cell and in electrolyser modes. Impregnation with CGO and Pd allowed a 15 times increment of the power density (until limit is the cell architecture). The same cell with an impregnated negative electrode was then tested in steam electrolysis mode in a non-reducing environment. The overall performance is slightly lower than state-of-the-art materials and comparable with similar perovskites, and in general is fair considering the needed cell optimisation (i.e a anode supported configuration is necessary). The cell (impregnated and not) activates at 0.7 V. Obtained data suggest thus LSGF/LSGM/LSGF cell, is promising as reversible SOC for intermediate temperature.

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Section: Cell Preparationmentioning

confidence: 99%

Section: Compatibilitymentioning

confidence: 99%

Reversible, all-perovskite SOFCs based on La, Sr gallates

Glisenti

Bedon

Carollo

et al. 2020

International Journal of Hydrogen Energy

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“…Nanocomposite powder synthesis and treatment: The supporting perovskite has been synthesized by means of a solid combustion synthesis route 30 . LSGF is, then, added to a solution of iron(II) acetate, and the mixture is kept under stirring for 24h; the amount of Fe(II) vs. supporting perovskite was selected to obtain 10%mol deposition.…”

Section: Experimental Section Synthesismentioning

confidence: 99%

“…Application of LSGF as a SOFC cathode has been proposed, especially coupled with LSGM as electrolyte [27][28][29] . In general LSGF more appreciated characteristics are: stability, reversibility under redox environ-ments, high economic and environmental sustainability, while electrochemical performances need to be enhanced 30 .…”

Section: Introductionmentioning

confidence: 99%

Rational Development of IT-SOFC Electrodes Based on the Nanofunctionalization of La_0.6Sr_0.4Ga_0.3Fe_0.7O₃ with Oxides. PART 1: Cathodes by Means of Iron Oxide

Bedon

Rieu

Viricelle

et al. 2018

ACS Appl. Energy Mater.

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Solid Oxide Fuel Cells (SOFCs) are electrochemical devices capable of converting and storing energy in a sustainable and efficient way. The decrease of the operating temperature could be of great help for their diffusion. The use of nanocomposites is a smooth way to design materials with many advanced functionalities that could not be reached at the same time with only a single component. Our aim is in developing LSGF-based nanocomposites by depositing oxides' nanoparticles in order to improve the electrocatalytic performances. In this first part we focussed on cathode and iron oxide was deposited by wet impregnation. The composites' powders have been extensively characterized by means of XRD, XPS, N 2-asdorption, SEM, EDX, TPR, O 2-TPD and the results compared with those obtained for LSGF. The supporting perovskite stabilizes Fe(II) and a deep interaction between the deposited oxides and the perovskite surface is evident. Fe was observed to diffuse inside the perovskite during thermal treatments and this phenomenon greatly affects oxygen vacancies, mobility, and exchange capability. Focusing on the IT-SOFCs, symmetric cells of the type FeO x +LSGF/CGO/LSGF+FeO x have been prepared starting from the nanocomposites' powder. The effect of the SOFCs preparation conditions (temperature, atmosphere) on the electrode and on the cell has been assessed and compared, also through in-situ high temperature XRD, simulating, on the electrodes' powder, the same treatment necessary to prepare the cell. The use of nanocomposites powders as starting point for electrodes allows to deeply modify the electrochemical performance. A thin, Sr/Fe-rich foil forms on the surface of the electrode during SOFC thermal treatment and deeply improves the electrochemical behaviour of the FeO x +LSGF cathode. The electrochemical results are encouraging for future application in SOFCs, as nanocomposite has an ASR of 2.1 Ω•cm 2 at 620°C, only ⅓ of LSGF's one in the same conditions.

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“…Mixed ionic and electronic conductors (MIEC) have gained much attention due to their potential application in oxygen transport membranes to separate oxygen from air or other oxygencontaining gas mixtures as well as their potential application on membrane reactors for partial Published in: Journal of the European Ceramic Society 38 (2018) 5058-5066 2 oxidation, for example syngas production [1,2]. Moreover, MIEC perovskites are used in electrochemical devices such as solid oxide fuel cell (SOFC) electrodes, particularly cathodes [3,4]. One promising class of membrane materials are the cubic perovskites ABO3-δ, with the A cation at the corner of the cube and the B cation in the centre of the cubic unit cell with oxygen ions in the face-centred positions, leading to the formation of BO6 octahedra extended three dimensionally.…”

Section: Introductionmentioning

confidence: 99%

Co and Fe co-doping influence on functional properties of SrTiO3 for use as oxygen transport membranes

Liu

Baumann

Müller

et al. 2018

Journal of the European Ceramic Society

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Perovskite-structured powders of SrTi1-xCoxO3-δ (STC-x) with nominal stoichiometry of x=0-0.75 as well as SrTi0.75Co0.25-yFeyO3-δ (STCF-y) where y=0-0.25 were synthesized using the Pechini method. Thermal/chemical expansion behaviour, total electrical conductivities, and oxygen permeation rates were investigated. The substitution of Ti with Co leads to an increase in both electronic and ionic conductivities and, therefore, oxygen permeability. Thermal and chemical expansions also increase slightly. The optimum Co content was found to be 25-35% due to the trade-off between phase stability and permeability. The oxygen permeation rate of STC35 is comparable to that of state-of-the-art (La,Sr)(Co,Fe)O3-δ, whereas the expansion coefficients are lower. Co-doping in STCF-y did not produce any significant differences in oxygen permeability at both high temperature and sample thickness (1.0 mm), i.e. in a solid-state diffusion-limited regime. At lower temperatures (<800 °C), STC25 exhibits higher permeability than STF25 due to the higher catalytic activity of Co compared to Fe.

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On the synthesis and stability of La0.6Sr0.4Ga0.3Fe0.7O3

Cited by 10 publications

References 36 publications

Reversible, all-perovskite SOFCs based on La, Sr gallates

Reversible, all-perovskite SOFCs based on La, Sr gallates

Rational Development of IT-SOFC Electrodes Based on the Nanofunctionalization of La_0.6Sr_0.4Ga_0.3Fe_0.7O₃ with Oxides. PART 1: Cathodes by Means of Iron Oxide

Co and Fe co-doping influence on functional properties of SrTiO3 for use as oxygen transport membranes

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On the synthesis and stability of La0.6Sr0.4Ga0.3Fe0.7O3

Cited by 10 publications

References 36 publications

Reversible, all-perovskite SOFCs based on La, Sr gallates

Reversible, all-perovskite SOFCs based on La, Sr gallates

Rational Development of IT-SOFC Electrodes Based on the Nanofunctionalization of La0.6Sr0.4Ga0.3Fe0.7O3 with Oxides. PART 1: Cathodes by Means of Iron Oxide

Co and Fe co-doping influence on functional properties of SrTiO3 for use as oxygen transport membranes

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Rational Development of IT-SOFC Electrodes Based on the Nanofunctionalization of La_0.6Sr_0.4Ga_0.3Fe_0.7O₃ with Oxides. PART 1: Cathodes by Means of Iron Oxide