Flow Channel Configurations of an Anode-Supported Honeycomb Solid Oxide Fuel Cell

Kotake, Shota; Nakajima, Hironori; Kitahara, Tatsumi

doi:10.1149/05701.0815ecst

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…This is ascribed to smaller hydrogen mole fraction in each flow channel in the downstream because of more anode flow channels in Type-B cell. Hence, the concentration overpotential becomes larger (1). We therefore numerically evaluate the hydrogen mole fraction distributions in the honeycomb cell using finite element method in the following section.…”

Section: Resultsmentioning

confidence: 99%

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Mass Transfer in an Anode-Supported Honeycomb Solid Oxide Fuel Cell

Kotake

Nakajima

2015

ECS Trans.

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An anode-supported honeycomb SOFC can achieve high volumetric power density and improve thermo-mechanical durability at high temperatures. We have so far fabricated the honeycomb cell with a cathode layer made of La0.7Sr0.3MnO3 (LSM) and an electrolyte layer of 8YSZ on a porous anode substrate in honeycomb form of Ni/8YSZ. In the present study, current-voltage characteristics of the cells having different porous substrate thicknesses and anode/cathode flow channel configurations are studied under different flow rates of fed hydrogen to clarify the effect of 3-dimensional fuel transport in the anode porous substrate on the cell performance. We also estimate the hydrogen mole fraction distributions in the honeycomb cell with different anode substrate thicknesses using the finite element method, and discuss appropriate porous anode substrate thickness.

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Section: Resultsmentioning

confidence: 99%

“…The parameters employed for the calculation were presented elsewhere (1). 1.0mm, H80N80 The Maxwell-Stefan equation [1] for mass diffusion and convection was used to describe the mass transport phenomena for the gases inside the fuel cell. This equation was solved for the fuel and air channels and electrodes (10)…”

Section: Numerical Analysismentioning

confidence: 99%

Mass Transfer in an Anode-Supported Honeycomb Solid Oxide Fuel Cell

Kotake

Nakajima

2015

ECS Trans.

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“…On the other hand, tubular type requires further volumetric power density. Our previous studies have shown that honeycomb SOFCs give promising volumetric power density (8,9). In addition, they also presented a possibility to design the flow channel arrangement for fuel and air.…”

Section: Honeycomb Structurementioning

confidence: 99%

Fuel Production with a Cathode-Supported Honeycomb Solid Oxide Electrolysis Cell

2019

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In recent years, the establishment of Power to Gas technology is in progress. Promising methods include steam electrolysis and co-electrolysis using the Solid Oxide Electrolysis Cell (SOEC). We have developed a honeycomb electrolytic cell with a larger reactive area per unit volume than the conventional flat and tubular types. Thereby volumetric density of fuel production rate can be greatly improved, leading to a development of compact and high performance steam electrolysis systems. In this study, we address hydrogen production by steam electrolysis with an SOEC having a porous honeycomb support consisting of Ni-YSZ cathode. Current-voltage curves were measured with sampling the cathode outlet gas for gas chromatography. As the results, we confirmed that hydrogen concentration in the outlet increased as the current increased. The experimental results are useful to validate numerical models to design practical honeycomb cells.

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“…We also calculate the current and hydrogen/oxygen partial pressure distributions by finite element (FE) simulation (COMSOL Multiphysics 4.3a) in order to confirm this tendency. Governing equations are presented elsewhere (12,13). We set an exchange current density, a charge transfer coefficient and an electrode porosity so that the FE model gives current distributions close to the in-situ currents measured by the segmented cathodes.…”

Section: Effect Of Hydrogen Transport On the Cell Performancementioning

confidence: 99%

In-Situ Analysis of the in-Plane Current Distributions in an Electrolyte-Supported Planar Solid Oxide Fuel Cell by Segmented Electrodes

et al. 2017

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In the planar solid oxide fuel cell (SOFC), the fuel/oxidant distributions cause current and temperature distributions over the electrodes under the separator ribs and flow channels. Optimized designs of the separator to improve the output power and chemical/thermo-mechanical durabilities of practical stacks require numerical models validated by in-situ current distributions measured. We have therefore addressed in-situ measurements of in-plane spatial current variations of an electrolyte-supported planar SOFC by segmented cathodes opposing the anode rib and flow channels. We focus on the effect of the rib width on the spatial current distribution. We model the current and hydrogen partial pressure distributions by finite element modeling so that the model agrees with the in-situ measurements by the segmented cathodes with determining the exchange current densities, electrode porosities, electrolyte ion conductivities, and electrode ion/electron conductivities.

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Flow Channel Configurations of an Anode-Supported Honeycomb Solid Oxide Fuel Cell

Cited by 8 publications

References 7 publications

Mass Transfer in an Anode-Supported Honeycomb Solid Oxide Fuel Cell

Mass Transfer in an Anode-Supported Honeycomb Solid Oxide Fuel Cell

Fuel Production with a Cathode-Supported Honeycomb Solid Oxide Electrolysis Cell

In-Situ Analysis of the in-Plane Current Distributions in an Electrolyte-Supported Planar Solid Oxide Fuel Cell by Segmented Electrodes

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