A polymer electrolyte fuel cell composed of a plurality of unit cells stacked
one
after another, which comprises: a water electrolysis portion and a fuel cell portion
disposed in the single plane of each unit cell; an oxygen electrode disposed on
one side of a proton exchange membrane and a hydrogen electrode disposed on the
other side in the stacking direction of the unit cells; a diffusion layer disposed
on both sides of each electrode for allowing generated electrons to pass through;
interconnectors disposed outside the diffusion layers and having a gas passage
for feeding the fuel cell portion with a gas; and a water passage disposed in the
interconnector on the side of the oxygen electrode for feeding the water electrolysis
portion with water. A fuel cell system and a production process of thereof are
also disclosed.
