자연급기 무가습 연료전지의 Dry-out조건
Dry-out conditions of free-breathing PEMFC with dry H2 gas
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Abstract
This study investigates drying condition when a small fan is added to a operating the free-breathing proton exchange membrane fuel cells (PEMFCs) with dry H2 and Air. Polarization tests were conducted on PEMFCs at cell temperatures between 30 and 50℃ under dry operation. In the results, the cell performance strongly depended on the cell temperature and the cathode gas stoichiometric flow rates. The cell performance increases as cell temperature decreases from 50 to 30℃. In the domain where the stoichiometry of air is quite large, reduction of the concentration overpotential compensated the increased internal resistance due to drying. The maximum performance was obtained at the small air flow rate beyond which flooding occurs. This indicates that the fan should be operated in the stoichiometry domain with a well designed cell structure to avoid flooding.