G121 自然給気無加湿燃料電池のドライアウト条件(一般セッション燃料電池II)

概要

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This study investigates drying condition for the case when a small fan is added to a free-breathing proton electrolyte membrane fuel cell (PEMFC) operating with dry H_2 and air. Polarization tests were conducted on PEMFCs at cell temperatures between 30 and 50℃. The result shows that the cell performance strongly depends on the cell temperature and the stoichiometric flow-rates of cathode gas. The cell performance increases as cell temperature decreases from 50 to 30℃. In the condition where the air flow-rate is quite large, internal resistance increases due to the progress of drying, but it is compensated by the decreased concentration over-potential. The maximum performance was obtained at a small air flow-rate in a narrow pass between dry-out and flooding. This indicates that the flow rate of the fan should be designed relatively small, if a cell design of avoiding flooding is possible.
一般社団法人日本機械学会の論文
2005-11-02