Influence of water vapor on performance of co-planar single chamber solid oxide fuel cells
- Influence of water vapor on performance of co-planar single chamber solid oxide fuel cells
- 이대희; 안성진; 김주선; 문주호
- Single chamber; SOFC; Reaction Mechanism; Single chamber solid oxide fuel cell; Water vapor; Impedance analysis
- Issue Date
- Journal of power sources
- VOL 195, NO 19, 6504-6569
- Influences of feeding gas compositions on the performance of co-planar, single chamber solid oxide fuel
cells (SC-SOFCs) are investigated with emphasis on the role of water vapor. The maximum open circuit
voltage (OCV) and peak power density are obtained at a methane-to-oxygen ratio of 3.5 under the wet
gas condition, and a stoichiometric ratio of 2.0 for methane partial oxidation under the dry gas condition.
In addition to the partial oxidation of methane on the anode and electrocatalytic reactions, both steam
reforming and methane combustion occur on the anode and cathode, respectively, in the presence of
water vapor. Local volume expansion and a rise in temperature associated with these parasitic reactions
intensify inter-mixing of the reactant and product gases by which the OCV and power density drastically
deteriorate with decreasing anode-to-cathode gap distance, as confirmed by impedance analysis for the
LSM-YSZ; YSZ; LSM-YSZ symmetrical cell.
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