Abstract
Polymer Electrolyte Fuel Cell (PEFC) is a very promising power source for automotive use. For the commercialization of fuel cell vehicles, cost reduction and improvement of power density are very important issues. It is well known that the oxygen transport incathode often limits the performance. Possibility has been shown from our previous investigation thatthe equivalent weight (EW) of ionomermay affect the oxygen transportresistance (OTR) in the catalyst layer (CL). The mechanism, however, has not been thoroughly studied. In this report we investigated theeffect, by using thein-situ measurement technique, and numerically analyzed the phenomena with a simple transportmodel in the CL.
