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1D‐Modelling and Experimental Study of the PEFC Dynamic Behaviour at Load Increase

The complex dynamic response of a 1‐dimensional polymer electrolyte fuel cell to load changes is numerically and experimentally investigated, in order to understand the transient transport processes in the different domains of the cell through the membrane‐electrode assembly. The analysis focuses on the comparison of cell response to step load changes, at different levels of reactants humidification. To render the model capable of capturing the cell behaviour at different operating conditions, a multiparameter optimisation procedure is performed to determine the most sensitive transport parameters. The optimisation procedure converges towards a well‐defined solution and the resulting parameters are compared to those available in the literature. Model results indicate that the time required to reach the new steady‐state after a load increase is controlled by the water transport in the membrane. The influence of the water diffusion coefficient at the different operating conditions is further investigated numerically.