An analysis of the performance loss with low platinum loaded cathode catalyst layers (CCLs) was conducted. A modified 1-D calculation model in the CCL was developed in this study, where newly developed oxygen transport resistance in the direction from pores in the CCL to platinum surface (R O2,CCL-micro ) and the effect of platinum oxide coverage on R O2,CCL-micro were taken into account. As a result, the increased voltage loss with low platinum loaded CCLs was demonstrated by the modified 1-D calculation model. The analysis results indicated that the oxygen transport loss caused by R O2,CCL-micro became a dominant factor of the performance loss with the low platinum loaded CCLs.
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