An anode-supported honeycomb SOFC can achieve high power density and improve thermo-mechanical durability at high temperatures. We have fabricated the honeycomb cell with an electrolyte layer of 8YSZ on an anode honeycomb substrate of Ni/8YSZ. The cathode layer is LSM-YSZ composite. Current-voltage and current-power density characteristics of the cells having different anode and cathode flow channel configurations are measured under different hydrogen flow rates and partial pressures. We also evaluate the hydrogen mole fraction distributions in the honeycomb cell using finite element method, and discuss appropriate anode and cathode flow channel configurations.
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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