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The polymer electrolyte fuel cell (PEFC) is expected as the future automotive power source. However, the PEFC is inferior to the current gasoline engine in the response to the load change such as the acceleration of the vehicle. The main reason of inferiority in such response is the difficulty of quick increase in steam supply to the MEA. In order to solve such difficulty, we made the study of the MPL having the ability to keep water to be supplied to the ion exchange membrane in running short of steam supply. The MPL is one of the parts constituting the MEA. We developed the prototype of the MPL containing the material, the activated carbon which has the ability to keep water. In the experiment to stop supply of the steam during the generation of electricity, the MEA using this prototype MPL could generate electricity longer than the MEA using the conventional MPL could do so. In this article, we showed that the MEA using this prototype MPL had the ability to keep water. Further it was showed that this water kept in the MPL could be supplied to the ion exchange membrane when steam supply to MEA decreases. © The Electrochemical Society of Japan, All rights reserved.

The Water Retention Effect of the MPL Containing the Activated Carbon for Polymer Electrolyte Fuel Cell