These undesired voltage levels accelerate the degradation of the cells in terms of carbon corrosion, platinum oxidation and membrane decomposition. The results show an inhomogeneous behavior of the segments caused by varying relative humidity along the gas channels. AB - Polymer electrolyte fuel cells reach high efficiency and zero emissions even under highly dynamic loads. The voltage over- and undershoots are proportional to the range of the load change. To investigate the influence of the geometry of the cell further, measurements with a segmented square triple serpentine flow field with the same active area and with different spatial current distributions are performed. N2 - Polymer electrolyte fuel cells reach high efficiency and zero emissions even under highly dynamic loads.