抄録
Water management is the critical issue for PEFC. In this study, the water production and transport in an operating PEFC has been experimentally investigated using optical single cell. The separator of this cell was replaced by the current collector which has gas channel, and this channel was observed through view port. From the results of the observation, it was found that the nuclei of water droplets were formed in the gas channel and grew into the larger droplets. And these droplets moved being pushed to the gas flow and then discharged from channel. It was also found that the distribution of current density corresponded to water distribution and that the humidity of anode gas had a large effect on cathode water distribution. Furthermore it was cleared that cell voltage fluctuation caused by discharge of water.
