Current density distribution of a PEMFC with big active area

Current density distribution of a single proton exchange membrane fuel cell(PEMFC)at working with 400 cm2 active area was measured by 35 sub-cells which were assembled on the anode endplate.The results showed that for fuel cell with big area,current density in the center tended to get lower because of the strain in the process of endplate tightening.The factors should be considered in further research,such as corrosion of plate,equivalence of segmentation measurement and problems in the segmentation were analyzed.