Ceramic membranes for intermediate temperature solid oxide fuel cells (SOFCs): state of the art and perspectives

Faro, Massimiliano Lo; Aricò, A.S.

doi:10.1533/9780857098658.4.237

Cited by 5 publications

(4 citation statements)

References 100 publications

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“…In some of our previous papers, we have examined the potentials and behavior of this electrolyte. According to the Arrhenius plot, LSGM had conductivity and activation energy similar to those reported for CGO (11).…”

Section: Resultssupporting

confidence: 70%

Bioethanol-Aided Electrolysis of H₂O

Faro¹,

Ometto²,

Perez³

et al. 2023

ECS Trans.

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This manuscript describes a novel electrochemical process for the electrochemical production of H2 using a solid oxide electrochemical cell. Part of the energy required for the process was supplied by ethanol, which was oxidized at the anode of a fully perovskite cell. In this experiment, we used a tailored cobaltite for the electrodes and a gallate-based perovskite electrolyte (La0.9Sr0.1Ga0.8Mg0.2O3-δ - LSGM) as the supporting element of an electrolyte-supporting cell (ESC). The present manuscript presents preliminary results from tests concerning LSGM structural analysis to demonstrate its robustness to reducing atmospheres, electrochemical experiments carried out in a complete cell between 700 °C and 800 °C, and surface analysis of the electrodes. With current densities over 1 A cm-2 and voltages between 0.27 and 0.41 V, this electrochemical process demonstrates a viable method for producing green hydrogen.

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Section: Resultssupporting

confidence: 70%

Bioethanol-Aided Electrolysis of H₂O

Faro¹,

Ometto²,

Perez³

et al. 2023

ECS Trans.

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“…Despite this advantageous OCV value, the achieved performance was affected by a slight higher ohmic resistance (Rs = 0.32 ohm cm 2 @ 0.7 V achieved with a dense electrolyte of a thickness of about 300 μm). Such lower performances for the electrolyte-supported SOFCs can be mitigated by reducing the electrolyte thickness, since the oxygen ion conductivities of CGO and LSGM are similar and better than the YSZ used in the Elcogen-modified cell [ 8 , 61 , 93 ]. However, this should not occur at the expense of the mechanical robustness.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

2020

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Exsolved perovskites can be obtained from lanthanum ferrites, such as La0.6Sr0.4Fe0.8Co0.2O3, as result of Ni doping and thermal treatments. Ni can be simply added to the perovskite by an incipient wetness method. Thermal treatments that favor the exsolution process include calcination in air (e.g., 500 °C) and subsequent reduction in diluted H2 at 800 °C. These processes allow producing a two-phase material consisting of a Ruddlesden–Popper-type structure and a solid oxide solution e.g., α-Fe100-y-zCoyNizOx oxide. The formed electrocatalyst shows sufficient electronic conductivity under reducing environment at the Solid Oxide Fuel Cell (SOFC) anode. Outstanding catalytic properties are observed for the direct oxidation of dry fuels in SOFCs, including H2, methane, syngas, methanol, glycerol, and propane. This anode electrocatalyst can be combined with a full density electrolyte based on Gadolinia-doped ceria or with La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM) or BaCe0.9Y0.1O3-δ (BYCO) to form a complete perovskite structure-based cell. Moreover, the exsolved perovskite can be used as a coating layer or catalytic pre-layer of a conventional Ni-YSZ anode. Beside the excellent catalytic activity, this material also shows proper durability and tolerance to sulfur poisoning. Research challenges and future directions are discussed. A new approach combining an exsolved perovskite and an NiCu alloy to further enhance the fuel flexibility of the composite catalyst is also considered. In this review, the preparation methods, physicochemical characteristics, and surface properties of exsoluted fine nanoparticles encapsulated on the metal-depleted perovskite, electrochemical properties for the direct oxidation of dry fuels, and related electrooxidation mechanisms are examined and discussed.

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“…Despite this advantageous OCV value, the achieved performance was affected by a slight higher ohmic resistance (Rs=0.32 ohm cm 2 @ 0.7 V achieved with a dense electrolyte of a thickness of about 300 m). Such lower performances for the electrolyte-supported SOFCs can be mitigated by reducing the electrolyte thickness, since the oxygen ion conductivities of CGO and LSGM are similar and better than the YSZ used in the Elcogen modified cell [8,54,85]. However, this should not occur at the expenses of the mechanical robustness.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

A Mini Review on Lanthanum Ferrites-based Exsolved Perovskites as Fuel-flexible Anode for Solid Oxide Fuel Cells

Faro¹,

Zignani²,

Aricò³

2020

Preprint

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Exsolved perovskites can be obtained from lanthanum ferrites, such as La0.6Sr0.4Fe0.8Co0.2O3, as result of Ni doping and thermal treatments. Ni can be simply added to the perovskite by an incipient wetness method. Thermal treatments include calcination in air (e.g., 500 °C) and subsequent reduction in diluted H2 at 800 °C to favor the exsolution process. The chemistry of the nanoparticles exsoluted on the substrate surface can be further modulated by a post treatment in air. These processes allow to produce a two-phase material consisting of a Ruddlesden-Popper type structure and a solid oxide solution e.g. α-Fe100-y-zCoyNizOx oxide. The formed electro-catalyst shows sufficient electronic conductivity under reducing environment at the SOFC anode. Outstanding catalytic properties are observed for the direct oxidation of dry fuels in SOFCs, including H2, methane, syngas, methanol, glycerol and propane. This anode electrocatalyst can be combined with full density electrolyte based on Gadolinia-doped Ceria or with La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM) or BaCe0.9Y0.1O3-δ (BYCO) to form a complete perovskite structure-based cell. Moreover, the exsolved perovskite can be used as a coating layer or catalytic pre-layer of a conventional Ni-YSZ anode. Beside the excellent catalytic activity, this material also shows proper durability and tolerance to sulphur poisoning. In this mini review, preparation methods, physico-chemical characteristics, surface properties of exsoluted and core-shell nanoparticles encapsulated on the metal-depleted perovskite substrate surface, electrochemical properties for the direct oxidation of dry fuels and related electrooxidation mechanisms are examined and discussed.

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Ceramic membranes for intermediate temperature solid oxide fuel cells (SOFCs): state of the art and perspectives

Cited by 5 publications

References 100 publications

Bioethanol-Aided Electrolysis of H₂O

Bioethanol-Aided Electrolysis of H₂O

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

A Mini Review on Lanthanum Ferrites-based Exsolved Perovskites as Fuel-flexible Anode for Solid Oxide Fuel Cells

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Ceramic membranes for intermediate temperature solid oxide fuel cells (SOFCs): state of the art and perspectives

Cited by 5 publications

References 100 publications

Bioethanol-Aided Electrolysis of H2O

Bioethanol-Aided Electrolysis of H2O

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

A Mini Review on Lanthanum Ferrites-based Exsolved Perovskites as Fuel-flexible Anode for Solid Oxide Fuel Cells

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Product

Resources

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Bioethanol-Aided Electrolysis of H₂O

Bioethanol-Aided Electrolysis of H₂O