Modeling polymer electrolyte fuel cells: an innovative approach

In this paper, a mathematical simulation model is proposed to describe the water transport in proton conductive membranes, used in polymer electrolyte fuel cells (PEFCs). The model, which includes the calculation of electroch emical parameters of a PEFC, represents a quite innovative approach. In fac t, it is based on the use of original mathematical relationships taking int o account diffusional and ohmic overpotentials for electrode flooding and m embrane dehydration problems. The calculated performance of polymer fuel cells using a Nafion 117 membran e clearly demonstrates the model validation (+/-3% variation with respect t o experimental data). Besides, analysis of model results allows a useful co mparison of two different membranes (Nafion 117, Dow) in order to define th e best membrane/electrode assembly. (C) 2001 Elsevier Science B.V. All righ ts reserved.