Cell components of the PEFC module were studied to improve the module performance. The cell performance in a high air utilization region was improved by selecting an air channel design of the separator in which high air flow speed was obtained. Optimization of TeflonĀ® amount on the cathode backing carbon paper also contributed the cell performance.

Modifications of the gas channel design and the backing carbon paper were carried out in a 200 cm2 x 20-cell module and 36-cell module. Dependence of air utilization on module performance was remarkably improved and power density of more than 0.3 W/cm2 was achieved in spite of the platinum amount in the cells was decreased to 1.1 mg/cm2.

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