Fuel cells and methods of operating same are provided. In an embodiment,
fuel cells include cylinders each provided with a spiral form groove
portion in the surface thereof and disposed in air supply or exhaust pipes
are rotated, wherein the amount of air supplied to power generation cells
can be sequentially increased on a cell-by-cell basis, and water formed at
the power generation cells can be discharged by sequentially raising the
pressure of air. In this regard, each power generation cell is constantly
supplied with not less than a fixed quantity of air, thus stable power
generation can be achieved.
