A two-dimensional full cell mathematic model for PEMFC with conventional parallel flow field was developed.In this model

the transport of the two charged species

electrons and ions

as well as that of the chemical species in MEA was considered.The model treated the catalyst layers as spherical agglomerates of polymer electrolyte coated catalyst particles.Different parameters for polymer electrolyte content in agglomerate and catalyst layer porosity were employed under different cell voltage.The polarization curves predicted at base case by the model agreed well with the published experimental data.Profile of chemical species and current density within MEA in running state was investigated respectively.The influences of pressure and sizes of Pt particles in catalyst on the fuel cell performance were also investigated.The simulation results showed the mass transport and reaction phenomena in MEA

suggested that water draining at cathode and gas humidification at anode is important to maintain the performance of single cell.The results indicated that high pressure of cathode inlet gas was good for PEMFC single cell performance

especially running under low cell voltage.It also indicated that within the same Pt loading

the fuel cell performance is better at smaller Pt particle size.