| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the corrosion of the catalyst-carrying carbon of an oxidizer electrode at the start and stop of a fuel cell system. <P>SOLUTION: At the time of starting and stopping a fuel cell system, a pressure control valve 8 at an oxidizer electrode exit 4b is closed when at least the supply of oxidizer gas is stopped, then a flow rate control valve 10 of carbonated water is opened and a carbonated water pump 11 is driven, and the carbonated water is introduced from the carbonated water tank 9 into the oxidizer electrode 4 of a fuel cell stack 1. At this time, the carbonated water is supplied from the oxidizer electrode exit 4b to the oxidizer electrode 4, and thereby the carbonated water is supplied from the portion of the oxidizer electrode closer to the fuel electrode exit. Thereby, the corrosion of the catalyst-carrying carbon of the oxidizer electrode on the side closer to the fuel electrode exit where oxygen is easily introduced by the invasion of air from the outside can be effectively prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
