Model of infiltrated La1−Sr Co1−Fe O3− cathodes for intermediate temperature solid oxide fuel cells

Enrico, Anna; Costamagna, Paola

doi:10.1016/j.jpowsour.2014.08.022

Cited by 21 publications

(12 citation statements)

References 78 publications

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“…The backbone closely resembles the packing of straight fibers because it is fabricated by sintering electrospinning fibers. Despite the sintering, the backbone still holds the straight fiber structure [33,38]. The outer shell consists of impregnated nanoparticles, which adhere to the backbone surface.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Contrary to in-depth experimental studies, there is little theoretical research, to the best of our knowledge. The work of Enrico, A. and Costamagna, P [38] was developed specifically for LSCF fibers. Being LSCF a MIEC (mixed ionic electronic conductor, embedding both electronic and ionic conduction simultaneously), a number of infiltrated particles below the percolation threshold were considered.…”

Section: Introductionmentioning

confidence: 99%

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A Theoretical Model for the Triple Phase Boundary of Solid Oxide Fuel Cell Electrospun Electrodes

et al. 2019

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Electrospinning is a new state-of-the-art technology for the preparation of electrodes for solid oxide fuel cells (SOFC). Electrodes fabricated by this method have been proven to have an experimentally superior performance compared with traditional electrodes. However, the lack of a theoretic model for electrospun electrodes limits the understanding of their benefits and the optimization of their design. Based on the microstructure of electrospun electrodes and the percolation threshold, a theoretical model of electrospun electrodes is proposed in this study. Electrospun electrodes are compared to fibers with surfaces that were coated with impregnated particles. This model captures the key geometric parameters and their interrelationship, which are required to derive explicit expressions of the key electrode parameters. Furthermore, the length of the triple phase boundary (TPB) of the electrospun electrode is calculated based on this model. Finally, the effects of particle radius, fiber radius, and impregnation loading are studied. The theory model of the electrospun electrode TPB proposed in this study contributes to the optimization design of SOFC electrospun electrode.

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Section: Theoretical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Theoretical Model for the Triple Phase Boundary of Solid Oxide Fuel Cell Electrospun Electrodes

et al. 2019

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“…This is due to the fact that diffusive losses (non-linear) are often negligible, and activation losses are linear due to the high operating temperature [43]. Instead, in IT-SOFC electrodes, due to the reduced operating temperature, depending on the electrode characteristics, diffusive losses can play a major role, and also activation losses can be non-linear [51], and actually both linear and non-linear IT-SOFC V-I curves are reported experimentally. In the case of the bi-layered IT-SOFC anodes under consideration, the effect of the current density is investigated in Figure 2, which reports 1/R p simulation results for different applied currents and different operating temperatures.…”

Section: Effect Of Operating Parameters: Current Density and Temperaturementioning

confidence: 99%

Modeling Analysis of Bi-Layer Ni-(ZrO2)x(Y2O3)1−x Anodes for Anode-Supported Intermediate Temperature-Solid Oxide Fuel Cells

2014

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Abstract:Intermediate temperature-solid oxide fuel cell (IT-SOFC) Ni-(ZrO 2 ) x (Y 2 O 3 ) 1−x (Ni-YSZ) anodes formed by two layers, with different thicknesses and morphologies, offer the possibility of obtaining adequate electrochemical performance coupled to satisfactory mechanical properties. We investigate bi-layered Ni-YSZ anodes from a modeling point of view. The model includes reaction kinetics (Butler-Volmer equation), mass transport (Dusty-Gas model), and charge transport (Ohm's law), and allows to gain an insight into the distribution of the electrochemical reaction within the electrode. Additionally, the model allows to evaluate a reciprocal overall electrode resistance 1/R p ≈ 6 S· cm −2 for a bi-layer electrode formed by a 10 µm thick active layer (AL) composed of 0.25 µm radius Ni and YSZ particles (34% vol. Ni), coupled to a 700 µm thick support layer (SL) formed by 0.5 µm radius Ni and YSZ particles (50% vol. Ni), and operated at a temperature of 1023 K. Simulation results compare satisfactorily to literature experimental data. The model allows to investigate, in detail, the effect of morphological and geometric parameters on the various sources of losses, which is the first step for an optimized electrode design.

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“…Additional benefits are the unique properties of electrospun structures, in particular high surface area and porosity, and efficient electron/ion transport along the fiber longitudinal direction , . Electrospun La 1– x Sr x Co 1– y Fe y O 3– δ cathodes infiltrated with gadolinia doped ceria (Ce 1– x Gd x O 2– δ ) have been investigated as cathodes for IT‐SOFCs both experimentally and theoretically , demonstrating improved performance over conventional infiltrated nanoparticle‐structured electrodes based on the same materials, especially in terms of long‐term stability . However, the pristine 3‐dimensional structure and the resulting electrochemical behavior of the electrospun cathodes have received little attention so far , , .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy of Electrospun La_0.6Sr_0.4Co_0.2Fe_0.8O_3–_δ Nanorod Cathodes for Intermediate Temperature – Solid Oxide Fuel Cells

et al. 2019

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Electrospun La0.6Sr0.4Co0.2Fe0.8O3–δ (LSCF) nanorod cathodes are investigated. Morphological characterization shows that the nanorods are arranged into a 3‐D stochastic structure, with multiple contact points with each other. Experimental characterization of symmetrical button cells through electrochemical impedance spectroscopy demonstrates an electrode polarization resistance Rp = 3.9 Ω cm2 at 940 K and Rp = 10.9 Ω cm2 at 890 K. The impedance results, measured from 890 K up to 1,200 K, show that the depressed Gerischer behavior is not an intrinsic feature of the electrode, since it appears only at certain well defined temperatures, and then it tends to disappear for other operating temperatures. Equivalent circuit model fitting is accomplished through the depressed Gerischer element, and also through an alternative circuit based on a normal Gerischer coupled to an RQ element. The superior fitting capability of the latter equivalent circuit is demonstrated. The latter circuit allows to assess separately the impedance contribution of the electrode bulk, associated to the Gerischer element, and of the electrode/electrolyte interface, associated to the RQ element. Both the related polarization resistances are larger with the electrospun LSCF 3‐D random nanorod electrode, rather than with an electrospun LSCF electrode with unbroken nanofibers laying neatly in‐plane over the electrolyte.

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Model of infiltrated La1−Sr Co1−Fe O3− cathodes for intermediate temperature solid oxide fuel cells

Cited by 21 publications

References 78 publications

A Theoretical Model for the Triple Phase Boundary of Solid Oxide Fuel Cell Electrospun Electrodes

A Theoretical Model for the Triple Phase Boundary of Solid Oxide Fuel Cell Electrospun Electrodes

Modeling Analysis of Bi-Layer Ni-(ZrO2)x(Y2O3)1−x Anodes for Anode-Supported Intermediate Temperature-Solid Oxide Fuel Cells

Electrochemical Impedance Spectroscopy of Electrospun La_0.6Sr_0.4Co_0.2Fe_0.8O_3–_δ Nanorod Cathodes for Intermediate Temperature – Solid Oxide Fuel Cells

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Model of infiltrated La1−Sr Co1−Fe O3− cathodes for intermediate temperature solid oxide fuel cells

Cited by 21 publications

References 78 publications

A Theoretical Model for the Triple Phase Boundary of Solid Oxide Fuel Cell Electrospun Electrodes

A Theoretical Model for the Triple Phase Boundary of Solid Oxide Fuel Cell Electrospun Electrodes

Modeling Analysis of Bi-Layer Ni-(ZrO2)x(Y2O3)1−x Anodes for Anode-Supported Intermediate Temperature-Solid Oxide Fuel Cells

Electrochemical Impedance Spectroscopy of Electrospun La0.6Sr0.4Co0.2Fe0.8O3–δ Nanorod Cathodes for Intermediate Temperature – Solid Oxide Fuel Cells

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Electrochemical Impedance Spectroscopy of Electrospun La_0.6Sr_0.4Co_0.2Fe_0.8O_3–_δ Nanorod Cathodes for Intermediate Temperature – Solid Oxide Fuel Cells