Abstract
A counter-flow type 40-cell proton exchange membrane fuel cell (PEMFC) stack with an effective electrode area of 200 cm 2 has been assembled and its performance was investigated. Under the condition of atmospheric pressure and 75 °C, the maximum power of the stack was 2.89 kW (0.36 W/cm 2 per cell) and 2.3 kW (0.29 W/cm 2 per cell) for H 2/O 2 and H 2/Air, respectively. However, the stack showed a rapid decay in performance after continuous operation of 1800 h. Electron probe micro analyzer (EPMA) and X-ray fluorescence (XRF) spectrometer analyses revealed that degradation of the catalyst and contamination of the polymer electrolyte membrane were the main causes of such sudden decay.
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