Optimization and parametric analysis of PEMFC based on an agglomerate model for catalyst layer

A one-dimensional, non-isothermal, single-phase, steady-state comprehensive model is developed to investigate the effects of different parameters of catalyst layer and operational case as relative humidity on the proton exchange membrane fuel cell (PEMFC) performance, then to optimize the design and operation of PEMFC. The agglomerate model with thin film of polymer and liquid water was employed to describe electrochemical reaction in catalyst layers. The model considers the effect of different production ratio of water vapor and liquid water in the reaction on the fuel cell performance. The effects of operational case as temperature, relative humidity of reactants and catalyst layer structure parameters as Pt loading, agglomerate radius and Pt radius on cell performance are computed and discussed in detail. The results indicate that agglomerate radius, Pt loading and Pt particle radius, operation temperature and pressure have different kinds of effects on performance, and the performance can be improved by suitable operational case and catalyst layer structure. Results can provide good reference for optimization design of the catalyst layer and the whole cell.