Dependence of power density on anode functional layer thickness in anode-supported solid oxide fuel cells

Kagomiya, Isao; Kaneko, Shunya; Yagi, Yutaro; Kakimoto, Ken‐ichi; Park, Kyeongsoon; Cho, Ki-Hyun

doi:10.1007/s11581-016-1860-5

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…This contribution was improved in comparison with our previous generation of cells possibly attributed to a better adhesion, due to the optimized use of AFLs. In addition, the R ohm value for cell-1 is lower than that of cell-2, which may be due to the extra contribution of AFL II in cell-2, as also observed in other works. ,,,, In accord with previous studies, , intermediate frequency component ( R 2 ), with capacitance values of about 10 –3 F·cm –2 , is assigned to the cathode activation, as this component was kept about constant for the different cells, and also presents the same value for previous cells using the same LSCF–SDC cathode . Low-frequency component ( R 3 ), with capacitance values of about 10 °F·cm –2 , is assigned to the hydrogen diffusion through the Ni–SDC support, which is also about constant for the studied cells.…”

Section: Results and Discussionsupporting

confidence: 81%

“…(49,50,51) These AFLs maximize the active sites of triple phase boundaries (TPBs) and also match thermal expansion coefficients (TECs) between anode and electrolyte to facilitate the long-term stability of SOFC. For instance, Kagomiya et al (48) reported the electrochemical results of anode-supported cells (60 wt% NiO-40 wt% YSZ) with and without AFLs (65 wt% NiO-35 wt% YSZ) of several thicknesses (from 10 to 100 µm). Among the studied cells, that with an AFL thickness of ~10 µm exhibited the highest power density.…”

Section: Introductionmentioning

confidence: 99%

“…The anode activation is a common problem in the different SOFC geometries. In planar anode-supported SOFCs, an effective strategy to overcome this issue consists of the use of an anode functional layer (AFL) between the support and electrolyte, − and even a graded anode with several compositional sublayers. − These AFLs maximize the active sites of triple phase boundaries (TPBs) and also match thermal expansion coefficients (TECs) between anode and electrolyte to facilitate the long-term stability of SOFC. For instance, Kagomiya et al reported the electrochemical results of anode-supported cells (60:40 NiO:YSZ (wt %)) with and without AFLs (65:35 NiO:YSZ (wt %)) of several thicknesses (from 10 to 100 μm).…”

Section: Introductionmentioning

confidence: 99%

“…In planar anode-supported SOFCs, an effective strategy to overcome this issue consists of the use of an anode functional layer (AFL) between the support and electrolyte, − and even a graded anode with several compositional sublayers. − These AFLs maximize the active sites of triple phase boundaries (TPBs) and also match thermal expansion coefficients (TECs) between anode and electrolyte to facilitate the long-term stability of SOFC. For instance, Kagomiya et al reported the electrochemical results of anode-supported cells (60:40 NiO:YSZ (wt %)) with and without AFLs (65:35 NiO:YSZ (wt %)) of several thicknesses (from 10 to 100 μm). Among the studied cells, that with an AFL thickness of ∼10 μm exhibited the highest power density.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Anode Functional Layers on Electrochemical Performance and Mechanical Strength in Microtubular Solid Oxide Fuel Cells Fabricated by Gel-Casting

Morales

Laguna‐Bercero

2018

ACS Appl. Energy Mater.

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Anode-supported micro-tubular solid oxide fuel cells (mT-SOFCs) using samaria-doped ceria (SDC) as electrolyte were fabricated, varying the composition and number of anode functional layers (AFLs), by combining the aqueous gel-casting and spraycoating techniques. Suitable aqueous slurry formulation of NiO-SDC was prepared using agarose as a gelling agent for gel-casting of tubular supports. Afterwards, 40:60 and 50:50 wt.% NiO-SDC as AFLs and SDC electrolyte were deposited by spraycoating, and subsequently co-sintered. Finally, mT-SOFCs with 2.5 mm outer diameter and thicknesses of 380 µm support; 0, 12 and 24 µm AFLs; 15 µm electrolyte; and 30 µm cathode were obtained. The influence of AFLs on the performance and mechanical integrity was investigated for the three cells. For this purpose, electrochemical and mechanical tests at both macroscopic and micro-/nanometric scales (at the AFLs region) were determined by flexural strength and nanoindentation techniques, respectively. The results evidence that the use of AFLs with an adequate composition and microstructure in the mT-SOFCs is required to improve the performance and mechanical strength of cell. The cell with a single-layer AFL of 50:50 wt.% NiO-SDC and 12 µm thickness exhibited the best performance (0.52 Wcm-2) at 650ºC using hydrogen as fuel and air as oxidant.

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Section: Results and Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Anode Functional Layers on Electrochemical Performance and Mechanical Strength in Microtubular Solid Oxide Fuel Cells Fabricated by Gel-Casting

Morales

Laguna‐Bercero

2018

ACS Appl. Energy Mater.

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“…The particle and pore sizes are desirable to be small in the AFL. 6 The optimal thickness of AFL is reported to be 10-20 μm, [10][11][12][13][14][15][16] which is almost the same as the anode active thickness. [17][18][19] Recently, the TPB density is quantitatively evaluated with a focused ion beam-scanning electron microscopy (FIB-SEM).…”

mentioning

confidence: 89%

Effect of Anode Thickness on Polarization Resistance for Metal-Supported Microtubular Solid Oxide Fuel Cells

Sumi

Shimada

Yamaguchi

et al. 2017

J. Electrochem. Soc.

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An anode functional layer (AFL) is inserted between anode substrate and electrolyte thin-film to increase the triple phase boundary (TPB) for anode-supported solid oxide fuel cells (SOFCs). On the other hand, better mechanical robustness, redox tolerance, rapid thermal cycling and cost reduction are expected for metal-supported SOFCs. The anode thickness of metal-supported cells (MSCs) is more important than the AFL thickness of anode-supported cells (ASCs), since the metallic substrate does not have TPB. In the present work, the metal-supported microtubular SOFCs with La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF)-(Ce 0.9 Gd 0.1 )O 1.95 (GDC) cathode, GDC electrolyte, BaCe 0.8 Y 0.2 O 3-δ (BCY) blocking layer and Ni-GDC anode on Ni substrate were investigated. The significant decrease in polarization resistance with increasing the anode thickness from 10 to 16 μm was confirmed by the distribution of relaxation times (DRT) analysis for the metal-supported microtubular SOFCs operated at 550 • C.

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Designing a Cost‐Effective and Sustainable Process for the Efficient Production of Planar Anode‐Supported Solid Oxide Fuel Cells

Parvaix,

Lenormand,

Rozier

2024

Energy Tech

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A sustainable process is designed to produce anode‐supported solid oxide fuel cells (SOFCs). Environmentally friendly solvents and additives are selected to prepare sequentially cast slurries to obtain a flexible multilayer tape whose cohesion is ensured by a 3D network of binder. This tape includes the components of the oxide precursor of the half cell with the functional and structural part of the anode. The optimization of debinding and sintering processes allows converting green tape into sintered multilayer ceramic using a single heat treatment. The use of optimized loads maintains planarity of samples with adjusted shape (circular to square) and size (from 0.8 up to 8 cm2) of anodic half cell. The cell's oxide precursor is supplemented by screen printing the cathode and converted to anode‐support SOFC when the cell is first used. The whole process maintains mechanical integrity, microstructure of structured components, and insures interfaces enabling charge transfer high enough to achieve standard performances such as power of 411 mW cm−2. The selection of cheap and harmless solvents and additives and the optimization of heat treatment lead to an ecocompatible low‐cost process for manufacturing SOFCs, easily transferable to the industrial scale and suitable for the manufacture of all systems based on ceramic multilayers.

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Dependence of power density on anode functional layer thickness in anode-supported solid oxide fuel cells

Cited by 10 publications

References 17 publications

Influence of Anode Functional Layers on Electrochemical Performance and Mechanical Strength in Microtubular Solid Oxide Fuel Cells Fabricated by Gel-Casting

Influence of Anode Functional Layers on Electrochemical Performance and Mechanical Strength in Microtubular Solid Oxide Fuel Cells Fabricated by Gel-Casting

Effect of Anode Thickness on Polarization Resistance for Metal-Supported Microtubular Solid Oxide Fuel Cells

Designing a Cost‐Effective and Sustainable Process for the Efficient Production of Planar Anode‐Supported Solid Oxide Fuel Cells

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