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A three-dimensional (3-D) pore network model of polymer electrolyte membrane fuel cell (PEMFC) is presented in order to evaluate the effect of pore size and the effective diffusion coefficient in random porous media. The model of pseudo cathode catalyst layer (CCL) consists of pores and a random distribution of carbon supported platinum (Pt/C) and electrolytes, which were generated on a computer by means of Monte Carlo method. In this study, we utilized this 3-D meso-scale porous model of the CCL, and investigated tortuosity of pores, electrolyte connectivity. The effective Knudsen diffusion coefficient can be successfully obtained. This meso-scale model is applied to study the effects of porosity, pore size and Pt content on the polarization characteristics of the PEMFC. The relation between the composition of the CCL and the characteristics of polarization curve has been clarified.
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Suzuki et al. (2010) studied this question.
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