A method for operating a fuel cell or a fuel cell stack (1) is presented, which, given a constant fuel gas flow, has an electrical maximum power that can be delivered depending on the operating temperature, as well as aging that depends on the operating du...

The method involves detecting current-voltage characteristic of fuel cell stack at operation intervals. The pitch with minimum value of each detected voltage-current characteristic, value for minimum of slope, or with minimum of slope related value is dete...

A fuel cell system (1) includes at least one apparatus (10) having a gas-permeable, in particular porous or honeycomb structure, which contains a substance which reacts with gaseous chromium species, or which is provided with such a substance, and where th...