Propulsion system for an aircraft, said propulsion system comprising a reversible fuel cell

A propulsion system for an aircraft that includes a tank containing dihydrogen and configured to be parked on a tarmac with a temporary tank containing water and an electric generator, the propulsion system including:

• a nacelle,
• an electric motor fixed inside the nacelle and including a shaft, a first electrode, and a second electrode,
• a propeller rotated by said shaft,
• a reversible fuel cell with at least one anode electrically connected to the first electrode and at least one cathode electrically connected to the second electrode, wherein the at least one anode and at least one cathode are configured to be electrically connected to the electric generator,
• a supply line configured to fluidically connect the tank to the fuel cell,
• a feed line configured to fluidically connect the fuel cell to the temporary tank, and
• a pump arranged on the supply line between the tank and the fuel cell, and wherein the pump is reversible to alternately drive the dihydrogen from the tank to the fuel cell or from the fuel cell to the tank.