Degradation mechanism of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ /Gd 0.1 Ce 0.9 O 2-δ composite electrode operated under solid oxide electrolysis and fuel cell conditions

Laurencin, Jérôme; Hubert, Maxime; Sánchez, Darío Ferreira; Pylypko, Sergii; Morales, M.; Morata, Álex; Morel, Bertrand; Montinaro, Dario; Lefebvre‐Joud, Florence; Siebert, Elisabeth

doi:10.1016/j.electacta.2017.05.011

Cited by 108 publications

(93 citation statements)

References 56 publications

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“…They constitute a Ni-YSZ fuel-cell electrode support of 300 mm and 7 mm thick YSZ electrolyte. In order to prevent YSZ-LSCF reactions, (potentially leading to formation of SrZrO 3 as insulating phase at the typical sintering temperatures of LSCF oxygen electrode), [22][23][24] a CGO barrier layer (thickness z 2 mm) was deposited by pulsed laser deposition technique (PLD) on the electrolyte surface. A homogeneous scaffold layer (total thickness z 10-12 mm) of ethanol-based ink of mesoporous CGO (3 wt%) was airbrushed by a spray-coater controlled by a 3D printing frame in x, y and z axes (Print3D Solutions) 25 on the oxygen electrode side of the cell located on a heated cell support (z80 C) to ensure good reproducibility of the process.…”

Section: Cells Fabricationmentioning

confidence: 99%

Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H₂O and CO₂ in solid oxide electrolysis cells

et al. 2018

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Section: Cells Fabricationmentioning

confidence: 99%

Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H₂O and CO₂ in solid oxide electrolysis cells

et al. 2018

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“…The main degradation mechanisms occurring in the cells are the chemical destabilization of the oxygen electrode [14,15], the diffusion of cations and Ni in the electrolyte and the formation nanopores leading to decrease its ionic conductivity [16,17] and the morphological evolution of Ni within the hydrogen electrode [18]. This latter phenomenon represents a significant contribution to the global cell degradation [19].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Ni-YSZ Electrodes in Solid Oxide Cells: Impact of Polarization and Initial Microstructure on the Ni Evolution

Monaco

Hubert

Vulliet

et al. 2019

J. Electrochem. Soc.

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Two types of solid oxide cells with different Ni-YSZ cermet microstructures have been aged in electrolysis and fuel cell modes for operating times ranging from 1000 to 15000 hours. The pristine and aged cermets have been reconstructed by synchrotron X-ray holotomography. Nickel agglomeration has been observed in the bulk of the operated samples inducing a significant loss of triple phase boundary lengths. The inspection of the microstructural properties has confirmed the stabilizing role of YSZ on Ni coarsening. Furthermore, the gradients of properties quantified at the electrolyte interface have revealed a depletion of Ni only in the electrochemically active region of the electrode. The process is strongly promoted for a coarse cermet microstructure when operated under electrolysis current. The evolution of the microstructural properties has been implemented in an in-house multiscale model. The simulations have shown that the loss of performance is dominated by the depletion of Ni in case of a coarse microstructure. Thanks to the computations, it has been shown that the Ni depletion is controlled by the cathodic overpotential. To explain this dependency, it has been proposed that the accumulation of oxygen vacancies in the double layer could deteriorate the Ni/YSZ interface and trigger the Ni depletion.

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“…In the present paper we propose the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF), that is a mixed electronic ionic conductor (MIEC), as the oxygen electrode. LSCF has been previously proposed by many different authors as the oxygen electrode for SOEC applications, but in planar configuration [2,13,16,21,22,23,24,25]. One of the most remarkable results is that of Schefold et al [26], where they operate an electrolyte supported planar solid oxide cell in the steam-electrolysis mode for more than 23,000 hours, with a current density of j=−0.9 A•cm −2 .…”

Section: Introductionmentioning

confidence: 99%

Reversible operation of microtubular solid oxide cells using La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O2-δ oxygen electrodes

López-Robledo

Laguna‐Bercero

Larrea

et al. 2018

Journal of Power Sources

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Yttria stabilized zirconia (YSZ) based microtubular solid oxide fuel cells (mT-SOFCs) using La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) and Ce 0.9 Gd 0.1 O 2-δ (GDC) as the oxygen electrode, along with a porous GDC electrolyte-electrode barrier layer, were fabricated and characterized in both fuel cell (SOFC) and electrolysis (SOEC) operation modes. The cells were anode-supported, the NiO-YSZ microtubular supports being made by Powder Extrusion Moulding (PEM). The cells showed power densities of 695 mW•cm-2 at 800 °C and 0.7 V in SOFC mode, and of 845 mA•cm-2 at 800 °C and 1.3 V in SOEC mode. AC impedance experiments performed under different potential loads demonstrated the reversibility of the cells. These results showed that these cells, prepared with a method suitable for using on an industrial scale, are highly reproducible and reliable, as well as very competitive as reversible SOFC-SOEC devices operating at intermediate temperatures.

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Degradation mechanism of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ /Gd 0.1 Ce 0.9 O 2-δ composite electrode operated under solid oxide electrolysis and fuel cell conditions

Cited by 108 publications

References 56 publications

Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H₂O and CO₂ in solid oxide electrolysis cells

Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H₂O and CO₂ in solid oxide electrolysis cells

Degradation of Ni-YSZ Electrodes in Solid Oxide Cells: Impact of Polarization and Initial Microstructure on the Ni Evolution

Reversible operation of microtubular solid oxide cells using La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O2-δ oxygen electrodes

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Degradation mechanism of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ /Gd 0.1 Ce 0.9 O 2-δ composite electrode operated under solid oxide electrolysis and fuel cell conditions

Cited by 108 publications

References 56 publications

Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H2O and CO2 in solid oxide electrolysis cells

Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H2O and CO2 in solid oxide electrolysis cells

Degradation of Ni-YSZ Electrodes in Solid Oxide Cells: Impact of Polarization and Initial Microstructure on the Ni Evolution

Reversible operation of microtubular solid oxide cells using La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O2-δ oxygen electrodes

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Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H₂O and CO₂ in solid oxide electrolysis cells

Infiltrated mesoporous oxygen electrodes for high temperature co-electrolysis of H₂O and CO₂ in solid oxide electrolysis cells